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Let's Build the Gibson GA1-RVT.....A 3-Tube Amp with Reverb & Tremolo, Part 1 of 4 

Uncle Doug
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I've been fascinated with the Gibson GA1-RVT circuit for many years and finally decided to build one, incorporating some updates and improvements. Although the amp has only three miniature amplification tubes (and a 5Y3 rectifier), it offers single-ended output as well as grid-bias-modulating tremolo and a tube & transformer-driven spring reverb.
In this Part 1 (of 4) Video, we will discuss both the circuit and compound tubes it utilizes, then create a parts list, fabricate a chassis from 16-gauge hot-rolled steel, then machine the chassis and prepare it for painting and final wiring and assembly. Additional topics will include making a 2 Meg AT pot and color-changing LED pilot lights.
If you enjoy advertising-free videos like this (we personally do not monetize our videos), please SUBSCRIBE and support our channel by becoming a Patreon patron at: / uncledougsvintageamps or by making a PayPal contribution to dldcam@aol.com. Thanks so much for watching :)
Here is the link to the Parts List: app.box.com/s/...
Here is the code for a 10% Discount on Lacquered Tweed Deluxe 5E3 Cabinet from Mojotone: UD5E3 Should be good for several months.

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28 авг 2024

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Комментарии : 537   
@UncleDoug
@UncleDoug 4 месяца назад
CORRECTIONS: 1.) I misspoke regarding the insertion point of the "wet" reverb signal. It is fed into the grid of the upper 6EU7 triode along with the dry signal from the 6AN8 triode.
@goodun2974
@goodun2974 4 месяца назад
I understand that you are trying to clone the Gibson circuit exactly; but you, or anyone who follows in your footsteps in trying to build one of these, could save the cost of the reverb-drive transformer (and some space on the chassis) by using a capacitor-coupled reverb circuit and a tank of the correct impedance for that type of drive. After all, capacitor-drive reverb was good enough for the famous Ampeg Reverborocket and for vintage Magnatone amplifiers! The only minor disadvantage is that a Fender style reverb tank wouldn't work.
@UncleDoug
@UncleDoug 4 месяца назад
@@goodun2974 Thanks for your helpful input, GU, but the $11 cost of the reverb driver was not exactly a financial burden.
@goodun2974
@goodun2974 4 месяца назад
@@UncleDoug I was thinking more in terms of saving some real estate space on the chassis...
@UncleDoug
@UncleDoug 4 месяца назад
@@goodun2974 It's a very compact transformer, GU.
@nathanpoole6342
@nathanpoole6342 4 месяца назад
Uncle Doug I have a question. I have an old western auto Riviera AM fm high Fidelity stereo receiver with a turntable. It belong to my parents and I would like to restore it. There is no information on the model number or serial number. Is there anyway to find the schematic for this item? Thank you.
@beenhonked5172
@beenhonked5172 4 месяца назад
Uncle Doug is a National Treasure.
@UncleDoug
@UncleDoug 4 месяца назад
You are too kind, BH. Thanks :)
@peteleoni9665
@peteleoni9665 4 месяца назад
Yes he is. And his dry sense of humor is awesome. The neighbors need to understand that they are host to a national treasure. One that raises their property values.
@UncleDoug
@UncleDoug 4 месяца назад
@@peteleoni9665 Thanks, Pete, but higher property values mean higher property taxes ;)
@peteleoni9665
@peteleoni9665 4 месяца назад
@UncleDoug As a guy that refuses to leave his swamp house for life you'd think I would understand. Yep you are right.
@TheJstewart2010
@TheJstewart2010 4 месяца назад
Someone asked on Peavey Forum about good books to explain how tube amps work. I told him that Uncle Doug's videos are far and away the best explanations I've ever found.
@icedog75
@icedog75 4 месяца назад
All is right with the world...an new video from "Uncle Doug"!
@UncleDoug
@UncleDoug 4 месяца назад
Thanks so much, ID :)
@drdyna
@drdyna 4 месяца назад
Uncle Doug, you're just what my inner peace needed this afternoon.
@UncleDoug
@UncleDoug 4 месяца назад
That's great to hear, Dr. D :)
@PetraKann
@PetraKann 4 месяца назад
......and a 3 part series.😎
@UncleDoug
@UncleDoug 4 месяца назад
@@PetraKann To be honest, it may even go 4 episodes, depending on the fine tuning required.
@PetraKann
@PetraKann 4 месяца назад
@@UncleDoug No complaints here champ Cheers
@aagevaksdal
@aagevaksdal 4 месяца назад
Happy days are here again! A new Uncle Doug video! 👍
@UncleDoug
@UncleDoug 4 месяца назад
Posted just for you, AA :)
@chadwickhurlburt6529
@chadwickhurlburt6529 4 месяца назад
Love these videos. It's like I'm "going to school". Thank you Uncle Doug! You're the teacher I've always wanted to find. Sorta like finding the wise man on top of the mountain. Your content and lessons are very appreciated.
@UncleDoug
@UncleDoug 4 месяца назад
That's great to hear, Chad. We're glad the videos are helpful and appreciated.
@UncleDoug
@UncleDoug 4 месяца назад
Glad to hear it, Chad. Thanks !!
@tomstiel7576
@tomstiel7576 4 месяца назад
Dang if it weren't just last night I found myself thinkin about my dear ole Uncle Doug,,,wish you lived closer,you could have free reign in my fab shop
@UncleDoug
@UncleDoug 4 месяца назад
I would enjoy the "free reign" a great deal......but at least I'm no longer using a sledge hammer to form chasses ;)
@sootikins
@sootikins 4 месяца назад
@@UncleDoug Yeah, but you could *really* use a nice big set of Greenlee chassis punches! If I find myself with $1K of spare cash I'll send you a set. It's just kinda painful seeing you have to do all that deburring and chamfering when there's an easier way... 😉
@UncleDoug
@UncleDoug 4 месяца назад
@@sootikins Thanks, Sooti, but I have a set. I didn't think they were useable with 16 gauge hot rolled steel.
@sootikins
@sootikins 4 месяца назад
@@UncleDoug I suppose that depends on the specific punches. I know that at least some Greenlees will punch 30mm holes in 12ga panels for mounting switches without damage or complaint.
@UncleDoug
@UncleDoug 4 месяца назад
@@sootikins I'll bet a challenge like that would require a hydraulic ram rather than the manual wrench and bolt.
@alvaroomedas9542
@alvaroomedas9542 8 дней назад
During the pandemic I came across this awesome channel. How transformers works.. vacuum tubes.. etc The way I was able to understand it was unreal. You are so good at teaching that made me fall in love with this world. I’m starting an electrical engineering degree at 28 😂 😂 Better late than never!! Thanks for your work and effort. It really inspires other people. Greetings from Andalucia!!
@UncleDoug
@UncleDoug 8 дней назад
Wow!! That's great news, Alva. Thanks so much.....and best wishes for success with your continuing education.
@NickCoplowe
@NickCoplowe 4 месяца назад
Yay!!! Just got out of the shower, ate food and played with my cats, and there's a new Uncle Doug video one hour ago!!! Maybe I should buy a lotto ticket
@UncleDoug
@UncleDoug 4 месяца назад
It's YOUR day, Nick :)
@TheGuitologist
@TheGuitologist 4 месяца назад
Good to see this project underway, Doug.
@UncleDoug
@UncleDoug 4 месяца назад
Let's hope the journey ends well, Brad :) I cannot find any reference to this particular amp or RVT circuit on Reverb, the VG Price Guide, or other sites. I wonder if it ever really existed ??
@kendavis8046
@kendavis8046 4 месяца назад
It's going to be an epic low-watt amp! Thanks, Uncle Doug!
@UncleDoug
@UncleDoug 4 месяца назад
I sure hope so, Ken. It's getting to be a fairly expensive, time-consuming build....but I'm quite optimistic :)
@lynnagan7347
@lynnagan7347 4 месяца назад
Uncle Doug for President!!! You sir are a GEM!
@UncleDoug
@UncleDoug 4 месяца назад
Thanks so much, Lynn :)
@jagtone
@jagtone 28 дней назад
Uncle Doug is lucid and sane, and he has actual skills. He is therefore overqualified for that position.
@FishloreJimson
@FishloreJimson 4 месяца назад
I was very happy with my mojotone cabinet. A GA-5 8 inch combo cabinet with white tolex and ox blood grill cloth. Wood and metal working are the big obstacles to my enjoyment of this hobby. Now I buy broken amps on reverb, gut them and use the cabinets, chassis and transformers if they work. Very excited for the rest of the project. Thanks for the video.
@UncleDoug
@UncleDoug 4 месяца назад
You're welcome, FJ. I hope you enjoy it.
@baldmandoom
@baldmandoom 2 месяца назад
Thank you for doing this, this might be even more enjoyable than your repair videos.
@UncleDoug
@UncleDoug 2 месяца назад
You're welcome, BMD. I'm glad you enjoyed it.
@jorgearodriguezdiez
@jorgearodriguezdiez 4 месяца назад
Your videos are my therapy!! Thanks for all you’ve taught to this community. I’m an Electrical Engineering professor and use your analogies in my class to explain how devices amplify. Thank you 🙏
@UncleDoug
@UncleDoug 4 месяца назад
I am quite flattered to hear that, Jorge. Thanks so much for your kind words :)
@user-ck8bo3dr9z
@user-ck8bo3dr9z 4 месяца назад
New "Let's make..." video - new tips and secrets from our dear Uncle Doug. What a nice day!
@UncleDoug
@UncleDoug 4 месяца назад
I hope you enjoy it. Thanks !!
@avi8tor13
@avi8tor13 4 месяца назад
Filled my mouth with cheese and waited with baited breath for another spectacular video! Thank you, Uncle Doug. Can’t wait for parts two and three!
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, A. I was wondering where all my cheese went ;)
@steverollinson6906
@steverollinson6906 4 месяца назад
I heard it helps youtube channels if we comment so, great job and thanks for all the years of teaching and sharing!
@UncleDoug
@UncleDoug 4 месяца назад
It helps me when I hear from viewers, Steve. Thanks to you too.
@velvetsound
@velvetsound 4 месяца назад
This circuit looks really fascinating. I want to hear how this sounds before picking my next build now… can’t wait to hear the finished product!
@UncleDoug
@UncleDoug 4 месяца назад
I too am curious about the outcome, VS. Will the output power, tremolo, and reverb all be worth the time, trouble, and expense? We'll see.
@michaelszarzynski8698
@michaelszarzynski8698 4 месяца назад
​@@UncleDoug😮😮
@UncleDoug
@UncleDoug 4 месяца назад
Neither can I, VS. Thanks !!
@mj-dd2fb
@mj-dd2fb 4 месяца назад
YAY! Another Uncle Doug video! Thank you sir!
@UncleDoug
@UncleDoug 4 месяца назад
Our pleasure, MJ :)
@captainfineweather5610
@captainfineweather5610 3 месяца назад
Finally I've arrived at more recent episodes... Uncle Doug is the man!
@UncleDoug
@UncleDoug 3 месяца назад
We're glad you're enjoying our videos, Capt.
@tommyfoley
@tommyfoley 4 месяца назад
Nothing better than a UD scratch build series.
@UncleDoug
@UncleDoug 4 месяца назад
I hope it lives up to your expectations, Tommy :)
@saxhorn1508
@saxhorn1508 4 месяца назад
Awhile back I built an amp and cabinet per your videos. Lots of fun. A tip for those of us who don’t weld: the chassis ends can be filled with 1/4” to 1/2” hardwood blocks epoxied in. Works fine.
@Jonathan_Doe_
@Jonathan_Doe_ 4 месяца назад
Find a small local fab shop or laser cutting place with a TIG welder, us welders are very food motivated, like labradors. Take some chocolates in and those corners will be welded up in 5 minutes.
@UncleDoug
@UncleDoug 4 месяца назад
That's a trick that Valco used a lot, Sax, but they used screws instead of epoxy.
@UncleDoug
@UncleDoug 4 месяца назад
@@Jonathan_Doe_ Chocolate......or 44 oz. Polar Pops work for me :)
@rustyrobinson8027
@rustyrobinson8027 3 месяца назад
Uncle Doug thanks for the upload ❤️🇺🇸
@UncleDoug
@UncleDoug 3 месяца назад
You're welcome, Rusty :)
@PennStacker
@PennStacker 4 месяца назад
Thanks UD! My fave RU-vidr! Great to see you, or rather, hear you. Hope you are well. 👍🏻
@UncleDoug
@UncleDoug 4 месяца назад
Never better, PS. I hope you enjoy it :)
@dale1956ties
@dale1956ties 4 месяца назад
Hiya Uncle Doug!!😃 Y'know, when you think about it there are very few guys who are proficient in building a circuit like this as well as the metal fabrication, PLUS the woodworking skills to build the cabinet. Not to mention the tweed covering. Well done indeed. Thanks for sharing it.
@UncleDoug
@UncleDoug 4 месяца назад
You're welcome, Dale. I hope you enjoy it :)
@stratcat4450
@stratcat4450 4 месяца назад
Hello Uncle Doug. Thank you so much for this new series on a fascinating circuit. I pray you, the wife, an the kittys are all very well. There is not, or will there ever be a channel that comes close to what you put out for us.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks so much for your kind words and wishes, SC. We really appreciate them :)
@magnusekhall
@magnusekhall 4 месяца назад
Great to see a new video!
@UncleDoug
@UncleDoug 4 месяца назад
Glad to hear it, Magnus :)
@markbailey1911
@markbailey1911 4 месяца назад
Amazing as usual Doug . I'd love to make this amp just can't afford it right now , but one day soon it's going to happen. Thankyou so much for the inspiration Mark
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, Mark :)
@darylstillman1
@darylstillman1 4 месяца назад
Wow! , I've been looking for a single ended tremelo/ reverb schematic . I'm glad you showed this, this looks like a really cool project, can't wait to see it finished.
@UncleDoug
@UncleDoug 4 месяца назад
Nor can I, Daryl. The wiring is proving to be quite a challenge within the rather claustrophobic chassis. Thanks !!
@toolmanchris
@toolmanchris 4 месяца назад
Nice work as usual Doug. I see the cuts on your hands are related to the amount of metalwork completed 😂
@UncleDoug
@UncleDoug 4 месяца назад
It's all Hollywood makeup to promote pity contributions :)
@toolmanchris
@toolmanchris 4 месяца назад
@@UncleDoug 😂😂
@david25876
@david25876 4 месяца назад
This looks really interesting. I was considering a bassman clone but this one is intriguing. I’m on board. Let’s do it!!!
@UncleDoug
@UncleDoug 4 месяца назад
I'm glad you share my interest in this efficient little circuit, David :)
@piggycity
@piggycity 4 месяца назад
Admire Uncle Doug’s work and was very excited to find this today
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, AQ. I hope it exceeds your expectations :)
@timbuckxxi9690
@timbuckxxi9690 4 месяца назад
A great little amp this will be. Hello Uncle Doug !
@UncleDoug
@UncleDoug 4 месяца назад
I hope so, Tim. Thanks !!
@timbuckxxi9690
@timbuckxxi9690 4 месяца назад
@@UncleDoug A 12" speaker is a good choice for this one...And having the pre-made cabinet all ready to load is worth it X 2.. Cheers !
@UncleDoug
@UncleDoug 4 месяца назад
@@timbuckxxi9690 I thought so too, Tim. The Mojotone cabinet is magnificent.....at twice the price :)
@rbaker1423
@rbaker1423 4 месяца назад
The top control opening in that cabinet is 2-1/8" X 12-3/8", and the corners are significantly rounded (so stay clear of the corners). I just measured it on mine.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, RB. The cabinet arrived immediately after Part 1 was posted (as predicted) and the chassis has been fitted to it.
@robmcrae5776
@robmcrae5776 3 месяца назад
Hey Uncle Doug! Thanks for all the amp wisdom and humor and cars! Tung Sol has started to make 6EU7s again. So anyone building your version will not have a problem sourcing them.
@UncleDoug
@UncleDoug 3 месяца назад
Greetings, Rob. Thanks for the helpful info :)
@peteleoni9665
@peteleoni9665 4 месяца назад
Doug. That's a great great idea! Potential to go very viral not that you probably care. Awesome idea, reverb, trem, crunch at low volumes. Perfect I will be building along in some form.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks !! The circuit will be improved as it takes shape, Pete, so be patient.....or creative :)
@MegaTubescreamer
@MegaTubescreamer 4 месяца назад
Your chassis hand tooling is exemplary and impressive ,😇👍 looking forward patiently to the next exciting instalments ... thanks so much uncle doug, creating an oasis of sanity in this batshit crazy world😎😊
@UncleDoug
@UncleDoug 4 месяца назад
Thanks so much, MT. It's good therapy for me too.
@peterflynn850
@peterflynn850 4 месяца назад
Thank you for leading us on another cool new adventure. I learn somuch from following these builds!
@UncleDoug
@UncleDoug 4 месяца назад
You're welcome, Peter. That's great to hear :)
@thatampguy
@thatampguy 4 месяца назад
Uncle D - love this type of content! Resurrection of old amps! Hope all's well.
@UncleDoug
@UncleDoug 4 месяца назад
Glad to hear it, TAG :) Never better.
@TheJstewart2010
@TheJstewart2010 4 месяца назад
What an interesting project. I can't wait to see parts 2 and 3. School is back in session and I couldn't be happier.
@UncleDoug
@UncleDoug 4 месяца назад
That's great to hear, TJ. Thanks !!
@williambock1821
@williambock1821 4 месяца назад
Well heck I wasn’t planning on building anything until July or August but since you went through the trouble of making a very thoughtful parts list, I’m tempted to solder one of these together!
@UncleDoug
@UncleDoug 4 месяца назад
Take the parts list with a grain of salt, William. I was a little imprecise with the smaller components and I encourage personalization by the builder. Good luck :)
@UncleDoug
@UncleDoug 4 месяца назад
Let us know ho it turns out, William :)
@GuteisFinger
@GuteisFinger 4 месяца назад
Another wonderful project Uncle Doug. Your videos continue inspire, both as templates for creating fun and useful amplifiers, and also as templates for how to share knowledge with the less well informed. And, I like the fact that you're using an unusual design with tubes that aren't often used. This series is truly creative in every sense. I confess I still reminisce about the Supro S6422RT outtakes, but understand not everyone enjoys horror movies. The hot roll you're using is covered in mill scale that forms when the steel comes out of the rolling mill and is cooled and coiled. The oxidization forms a coating that is later removed in an acid bath (the "pickling" process) before going through a gauge reduction mill, annealing and final tempering. Cold rolled steel is typically harder and stronger than standard hot rolled steel, so the cursing and bruising indexes are higher by a significant factor. Good choice.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks for the informative input, GF. Between the grooving and the metal brake, I thought the bends came out quite well.
@williamrobinson2554
@williamrobinson2554 4 месяца назад
glad to see you on air! always informative video!
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, William :)
@BK-pj6nx
@BK-pj6nx 4 месяца назад
I just love this stuff! I too had the let’s build an amp from “scratch”bug many years ago. What a challenge, no internet. Fortunately there were Uncle Doug’s clones everywhere. Still have it and with your videos It keeps pumping out great tones. FYI I had a guitar playing friend bring me his Fender amp to see if I could figure out why the amp had a low but annoying buzz. Couldn’t find anything obvious until I realized the jewel light was way too bright, so I took it out and realized it was LED. Replaced it with the standard bulb and the low buzz went away??? Looking forward to next part.
@UncleDoug
@UncleDoug 4 месяца назад
We're glad the videos have been helpful, BK :)
@ianbutler1983
@ianbutler1983 4 месяца назад
Uncle Doug, Can you include your pets on part 2? I enjoy seeing them. Thanks.
@UncleDoug
@UncleDoug 4 месяца назад
I'll ask them if they'd like to appear, Ian :)
@Cyberbehni
@Cyberbehni 4 месяца назад
Another great video series from our beloved Uncle Doug like the robot amp built - so gorgeous and I can't wait for part two and three. Many greetings from Germany Chris
@UncleDoug
@UncleDoug 4 месяца назад
Thanks so much, Chris. We hope to live up to your expectations.
@TonySkiens
@TonySkiens 4 месяца назад
Still without an equal the coolest dude on RU-vid bar none.
@UncleDoug
@UncleDoug 4 месяца назад
Wow....You are too kind, Tony. Thanks !!
@Slugg-O
@Slugg-O 4 месяца назад
Great to see you again, Uncle Doug! I've been wondering if such an animal existed, and if not why not, and out of the blue you show up with a build video for one. I'm excited to see and hear the final result. Hope all is well.
@UncleDoug
@UncleDoug 4 месяца назад
It's always a pleasure to hear from you, Randy. We're doing quite well indeed. You too, I hope.
@hallanvaara6106
@hallanvaara6106 4 месяца назад
A great video once again, Uncle Doug! Let's hope your neighbours get well soon!
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, Hal......I'm sure they agree :)
@adenihil
@adenihil 4 месяца назад
Thanks UD. Looking forward to part 2. It’s nice seing you again ;)
@UncleDoug
@UncleDoug 4 месяца назад
Part 2 will be posted in early May, Aden. Thanks !!
@reggiewallace260
@reggiewallace260 4 месяца назад
Hello Uncle Doug. I was wondering when you'd release your next video -- and to my delight, it's the first of a 3-part series of another scratch build! Can't wait for the next part.
@UncleDoug
@UncleDoug 4 месяца назад
I hope you enjoy the series, Reggie :)
@ricksworkbench1386
@ricksworkbench1386 4 месяца назад
Always great to see a new Uncle Doug vid. Thanks for your knowledge and lessons.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks !! It's our pleasure, Rick :)
@v12dot
@v12dot 4 месяца назад
I can hear someone in the future calling that chassis a gem ! Great work UD Stewart 👍🏴󠁧󠁢󠁳󠁣󠁴󠁿
@UncleDoug
@UncleDoug 4 месяца назад
I sure hope so, Stewart. Thanks !!
@electricwhiterabbit
@electricwhiterabbit 4 месяца назад
That is awesome that you built your own break to make your own chassis. Your work is inspiring. Great job! I am really looking forward to the series to see how this amp works out.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, EWR. I too am wondering how it's going to sound. Fingers crossed that it sounds great ;)
@nomadicnerd818
@nomadicnerd818 4 месяца назад
I finally got a break from honey-do's and was able to watch this. Fantastic content as always. Your attention to detail is a mark of a true artisan and an inspiration to us in the next generation.. My only concern was with the multi-colored LED. Some of these devices operate off a PWM, which uses an oscillator and a counter to regulate how much red, green, and blue LED is used for each color. Depending on the oscillator's frequency and the refresh period, it could be a noise source for the audio signal. I thought a flicker bulb would be a cool pilot light for a build a couple years ago, but it inserted too much digital noise into the circuit. Of course anything can be filtered or shielded if one is determined enough.
@UncleDoug
@UncleDoug 3 месяца назад
I appreciate the helpful input, NN, and will heed your warning. It's such a neat effect I hope it causes no noise. We'll see.
@michaelwurn6268
@michaelwurn6268 4 месяца назад
Thanks so much for the new video. Your teaching style dovetails nicely with my learning style. I know basic electronics and you make it easy to understand these amplifiers. I have learned a tremendous amount watching you and thank you for including a parts list on this one and plans in the future.
@UncleDoug
@UncleDoug 4 месяца назад
You're very welcome, Michael :)
@hv8546
@hv8546 3 месяца назад
Best YT channel ever, thanks uncle.
@UncleDoug
@UncleDoug 3 месяца назад
Wow.....Thanks so much, HV :)
@kwgm8578
@kwgm8578 4 месяца назад
It's good to see you, Doug! Your channel hasn't popped up on my TV in a while, and it's nice to hear your voice again. I hope you've been well. That's quite a clever circuit you've got there. Looking forward to hearing it.
@UncleDoug
@UncleDoug 4 месяца назад
Never better, KW. Thanks so much :)
@Charlie-Oooooo
@Charlie-Oooooo 4 месяца назад
Nice to see you give old Gibson amps some love. Folks might be surprised to know which of their favorite albums this amp was used on. I heard Jack saying the same thing in the start of the video ;-)
@UncleDoug
@UncleDoug 4 месяца назад
We hope you enjoy the series, Charlie :)
@benlogan430
@benlogan430 3 месяца назад
The tube never tells me about your videos anymore? I guess they wanna decide what we watch. Glad I check on my own!!!
@UncleDoug
@UncleDoug 3 месяца назад
It's a conspiracy, Ben ;) Possibly because we don't monetize our videos.
@exeterslab7781
@exeterslab7781 4 месяца назад
Great start to another project Doug. Looking forward to part 2
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, Ex :)
@milofh550
@milofh550 4 месяца назад
Glad to see you Doug! Thankyou as always for the continued sharing of your immense wisdom :)
@UncleDoug
@UncleDoug 4 месяца назад
It's our pleasure, Milo :)
@Techead78
@Techead78 3 месяца назад
I think you are the Bod Ross of amp techs.
@UncleDoug
@UncleDoug 3 месяца назад
Thanks, T78 🙂
@matthewf1979
@matthewf1979 4 месяца назад
Great to see another build series coming up!
@UncleDoug
@UncleDoug 4 месяца назад
We hope you enjoy it, Matt.
@andyracksthecams
@andyracksthecams 4 месяца назад
Nice one. Looking forward to this.
@UncleDoug
@UncleDoug 4 месяца назад
I hope you enjoy it, Andy.
@justovision
@justovision 4 месяца назад
I love a scratch build series and that's a cool circuit design. I'm a hop, skip and a jump from where the Gibson factory was in Kalamazoo but I've never owned anything Gibson. I don't know if you've pre-shot this series and it's all done but using heat to "blue" that steel to a straw color and clear coat it would be pretty unique. I built the mojotone champ kit several years ago and the cabinet was very nice. I had an issue with the speaker it included and customer service was excellent.
@UncleDoug
@UncleDoug 4 месяца назад
I thought about clear-coating the blued steel, JV, but on this build will probably go with a colored lacquer finish. The Mojotone cabinet arrived today and is spectacularly nice. I am quite pleased.
@oldasrocks9121
@oldasrocks9121 4 месяца назад
Rummaged thru the crates, I found a whole sleeve of NOS 6GM8s, and that was it dang it! So close, lolol!!
@UncleDoug
@UncleDoug 4 месяца назад
Close.....but no BM. Wow, that doesn't sound good ;)
@ourlifeinwyoming4654
@ourlifeinwyoming4654 3 месяца назад
Incredible project - looking forward to the next video. Great job on the chassis design and build! I've often found myself fantasizing that the engineers that design transformers would simply include a piece of paper that's a template for cutting the opening they should fit into. But then I realize that if they did that, I'd never have the chance to exercise my collection of cuss words and I'd never have the chance to ask my wife, "Honey, where's that new box of bandaids we bought last year?"
@UncleDoug
@UncleDoug 3 месяца назад
Thanks, OLW. So true. Even sinks come with cut-out templates :) Also, no matter how careful I am, the holes (all five) have to altered somewhat.
@ourlifeinwyoming4654
@ourlifeinwyoming4654 3 месяца назад
@@UncleDoug Same here - every damn time.
@richclayton5785
@richclayton5785 4 месяца назад
Wow! A new UDoug vid just minutes ago! So happy to see you back on my RU-vid channel
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, Rich. It's good to be back :)
@MrPnew1
@MrPnew1 3 месяца назад
Uncle Doug is a true jewel 💎
@UncleDoug
@UncleDoug 3 месяца назад
Thanks, Mr P. You are too kind.
@blairmulhall9259
@blairmulhall9259 4 месяца назад
Can’t wait for parts 2&3 Uncle Doug
@UncleDoug
@UncleDoug 4 месяца назад
Part 2 is almost finished, Blair :)
@thirstin_more6429
@thirstin_more6429 4 месяца назад
you're the man, Uncle Doug
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, TM :)
@TheBoomtown4
@TheBoomtown4 4 месяца назад
Those mojotone cabs are amazing quality. Especially the lacquered tweed. I believe mojotone has the contract to build cabs for some major amp builders.
@UncleDoug
@UncleDoug 4 месяца назад
It arrived and exceeded all expectations.......beautiful !!
@badscrew4023
@badscrew4023 4 месяца назад
They build some Gibson amps
@OhmygodGoodday
@OhmygodGoodday 3 месяца назад
Wow this is going to be good! I have a Gibson Kalamazoo Reverb 12. It's circuit is very similar except it's double ended and uses 12ax7s and 6BQ5s, Terrible hum! Good Luck!
@UncleDoug
@UncleDoug 3 месяца назад
Thanks, OMG. I hope you're right :)
@W1RMD
@W1RMD 4 месяца назад
Wow! What a great looking project! You have amazing talent. I love buying from Antique Electronic Supply. I've bought from them for 30+ years without any issues and they are about the cheapest around, especially for the price. Those tapered drill bits are a MUST for thin metal! (unless you LIKE stitches). I'm looking forward to hearing it play. Take care.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, W1. Let's hope it sounds even better than we expect ;)
@suomi35
@suomi35 4 месяца назад
A "festivus miracle"! 😂 Shipping is chaos these days...thankfully you got the goods
@UncleDoug
@UncleDoug 4 месяца назад
Indeed. I have noticed a huge decline in shipping efficiency lately. I guess the world's madness has rubbed off on the transportation industry.
@construct09
@construct09 4 месяца назад
This is gonna be a hoot!!
@UncleDoug
@UncleDoug 4 месяца назад
I hope so, C09. Thanks !!
@kane100574
@kane100574 4 месяца назад
i love these!
@UncleDoug
@UncleDoug 4 месяца назад
We're glad, K :)
@Eddy63
@Eddy63 4 месяца назад
Can hardly wait for part 2 ... Thx
@UncleDoug
@UncleDoug 4 месяца назад
It's in the works, Eddy.
@ImTheReal
@ImTheReal 4 месяца назад
Uncleeeee. Another great project as always. Nice to see you!
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, ITR :)
@edwardhannigan6324
@edwardhannigan6324 4 месяца назад
Wow Doug...Just a fab project..Love it and all the info is incredible to this newbie here..Looking forward to the next videos...Take care..Ed..UK..😄
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, Ed. It's always good to hear from you :)
@peterbustin2683
@peterbustin2683 4 месяца назад
Hi Uncle Doug.❤from 🇬🇧
@UncleDoug
@UncleDoug 4 месяца назад
Greetings, Peter, from the desert Southwest, USA :)
@smbrumbaugh
@smbrumbaugh 4 месяца назад
Man I wish we lived closer to one another. I have my great grandpas old Gibson amp (all I can read is GA then it dives under the body of the cabinet). It isn't this circuit (based on the tubes), but I'd love for you to look under the hood. It works fine, but of there's anyone I'd trust to look it over, it'd be you. Thanks for the great content! By the way, your videos and advice helped me bring my grandpas old Silvertone back to life from being utterly broken to fully functional. Thanks for that too!!!
@UncleDoug
@UncleDoug 4 месяца назад
You can send some photos of the Gibson "mystery amp" to my FB page Uncle Doug's Vintage Amps. I'm glad the videos have been helpful :)
@bobsbarnworkshop
@bobsbarnworkshop 4 месяца назад
My first amp was a 1947 Gibson BR-1 that my dad had for his steel guitar (he had the guitar too!) this was late 60’s when he got it repaired for me! It was great for a beginner because it had mic inputs too!! Powered our whole little band! Then I bought a 68 Bandmaster (tall speaker cab) later a Dual Showman! Several Twin Reverbs…. Now I bought an Epiphone Blues Classic 30w… has incredible clean tone! Weighs a ton however!
@UncleDoug
@UncleDoug 4 месяца назад
You've had some fine equipment, Bob. I hope you enjoy our series :)
@charleslambiase5670
@charleslambiase5670 4 месяца назад
Uncle Doug I missed this one❤❤
@UncleDoug
@UncleDoug 4 месяца назад
We're glad you found it, Charles :)
@tedmich
@tedmich 4 месяца назад
19:45 RIP Gerald Weber , who recently passed! Great project Doug!
@UncleDoug
@UncleDoug 4 месяца назад
Fortunately, I believe his business lives on.....
@gerrickreidenbach8147
@gerrickreidenbach8147 4 месяца назад
Gerald Weber was an author of several books about tube guitar amps and circuits, published through Kendrick Books. As well as a top technician, designer and manufacturer of tube guitar amps: Kendrick Amps. Not to be confused with Ted A. Weber, founder and designer of Weber Speakers, who is also departed to my understanding.
@harveyellis6758
@harveyellis6758 4 месяца назад
Great to see another educational and informative video! That metal work appears to very tough on your hands with several wounds appearing.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, Harvey. The wounds are all fake......to stimulate pity contributions ;)
@bullthrush
@bullthrush 4 месяца назад
Fun new project, looking forward to more.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, Andrew :)
@krauz111
@krauz111 4 месяца назад
Great new video thanks uncle Doug, I really learn a lot and enjoy them
@UncleDoug
@UncleDoug 4 месяца назад
Thanks, K. We hope you enjoy it :)
@gilgaus9493
@gilgaus9493 4 месяца назад
Doug; I have one of these amps if you need photos. The tank was dead when I got it so we put in a long tank.
@UncleDoug
@UncleDoug 4 месяца назад
Are you SURE that you have a GA-1RVT......and not a GA-1RT? I have never seen or heard of an RVT actually existing, but the RT model is relatively common.
@cowhidemusic8904
@cowhidemusic8904 4 месяца назад
I've built two mojotone amplifier kits (Tweed Vibrolux, Marshall 18W) and agree with you on their cabinets...worth every penny.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks for the positive input, CHM. It was even better than I hoped.
@DeathCapAmplification
@DeathCapAmplification 4 месяца назад
Great video! I’ve built several old Gibson amps that use a 6EU7 in the first position/amplification stage. And even though the 6EU7 and 12AX7 have similar electrical characteristics, they do sound different. I used a 6EU7 to 12AX7 converter A/B test this and the 6EU7 tube gain is much smoother, warmer, and more natural sounding than most 12AX7’s I tested. Now this model Gibson uses the 6EU7 in position 2 so it probably won’t make nearly as much of an audible difference here which tube is used. But to my ears, the audible difference between the two is definitely notable in V1. And I liked the 6EU7 much better in the Gibson circuit than the 12AX7 in the same circuit. It’s unfortunate that 6EU7’s are very hard to find now a days and can be expensive if you do find them. Just thought I’d share my experiences with the 6EU7.
@UncleDoug
@UncleDoug 4 месяца назад
Thanks for sharing, DCA :)
@jeffm8122
@jeffm8122 4 месяца назад
Hello Doug, I enjoy all your videos but the ones where you build something from scratch are the best, particularly when the project is one of the more unusual amplifiers. We all love a 5E3 but those Nationals from the 40s/50s and the early Gibsons you repaired have a special tone. Looking forward to seeing and hearing the result of your latest labours. Your metal work skill is to the fore again. With a plate dissipation of 2.8W for its triode I think the 6AN8 will drive the reverb well. Stay healthy. Regards, Jeff.
@UncleDoug
@UncleDoug 4 месяца назад
Greetings, Jeff, and thanks for your very nice comments. Likewise on the good wishes :)
@martinwasson3088
@martinwasson3088 4 месяца назад
Great project! I started building one of these a while back using a 6U8a for the input pentode and reverb driver. Can't wait to see how this goes!
@goodun2974
@goodun2974 4 месяца назад
6EA8 and 6GH8 are the other tubes that are similar to a 6U8 and conceptually similar to the 7199. There is also a 6AN8 but like the 7199 those are pretty uncommon nowadays. I have to wonder if owners of vintage Dynaco hi fi amplifiers snagged up all the 7199 and 6AN8 tubes.
@UncleDoug
@UncleDoug 4 месяца назад
I considered using a 6U8, Martin, but was able to find a really nice 6AN8 at a reasonable price.
@regaldf.9493
@regaldf.9493 3 месяца назад
Oops, I'm a bit behind, but great to find a new video of yours, and even the first of a mini series! Although, I'm very surprised about that concept - both reverb and tremolo, but with that SE 6BM8 it's only to give about 3.5 watt! Here in Britain they call this 'fur coat but no knickers'! So, I'm curious as to the sound verdict. Looking forward to the next instalment!
@UncleDoug
@UncleDoug 3 месяца назад
Greetings, Reg. Recall that the first Fender Champ amplifiers had only 3.5 watts and nobody seems to complain about their tone and power :) Hopefully the mighty Gibson will sound as good.
@bodyhandvideos
@bodyhandvideos 4 месяца назад
The deadpan humor at 10:45 is equal to the tech parts of why I love these videos of Uncle Doug 😂
@UncleDoug
@UncleDoug 4 месяца назад
Thanks !! We try to add some levity to wake up our dozing viewers, BH ;)
@david25876
@david25876 4 месяца назад
Doug. Please go ahead and send me one of those 12” Jensen speakers. I only need one so that’s good.
@UncleDoug
@UncleDoug 4 месяца назад
I already sent the 3 I had to some needy orphans, David. Sorry ;)
@motherinlawsgarage6983
@motherinlawsgarage6983 4 месяца назад
been watching since i was 14, now im 24. time flies
@daleburrell6273
@daleburrell6273 4 месяца назад
...particularly as you get older...
@UncleDoug
@UncleDoug 4 месяца назад
.....especially if you're having fun ;)
@kir5551
@kir5551 4 месяца назад
Thanks Uncle Doug for you are!
@UncleDoug
@UncleDoug 4 месяца назад
You're welcome, Kir.
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