The Sort of Repair I Usually Reject - Solid State Acoustic Amp, Full of ICs, No Schematic

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It's never fun opening up an amp full of Integrated Circuits (ICs) without a schematic. But here goes... let's fix this Dean Markley KVC-60 Acoustic Guitar Amp...or at least attempt to.
Note: hidden within today's video is a numerological message to my Masonic brethren. When the time is right, you'll know what to do.
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5 май 2018

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Комментарии : 340

@Medicated1 6 лет назад

Holy shit, you sang that like you wrote it!!!! You never fail to impress the hell out of me Brad!

@andyfairman7812 6 лет назад

Totally agree! Awesome job Brad!

@lroy730 6 лет назад

Nice agressive Doors cover !!!!!\m/!!!!!

@seanlavery2236 19 дней назад

I love the fact ive been watching you so long i can watch a video from 6 years ago like its brand new. Such a wealth of info throughout the Guitologist library. Thanks Brad! You still continue to inspire and inform me each and everyday! Started watching you in 2015! Thank you my man!

@jamsguitar 6 лет назад

Watched several of your vids and you're very knowledgeable, but seeing you perform shows where your heart is at and where your inspiration really comes from, very cool. Cant say this about too many youtubers but I rang your bell. =)

@marknash7113 6 лет назад

Nice job chasing those circuit board gremlins down. Love hearing the acoustic playing and great tribute to Jim. Dig the new mic setup! Sounds good. Headphones on boys!

@witeshade 6 лет назад

If the lights are super bright, one thing you can try is to turn them around and have them reflect off the walls or ceilings. You can put some white paper or foam core up to help the reflection. You get softer and more diffuse light, which might be more comfortable and better for shadows. Kinda works like a big softbox but more convenient.

@johnwardle9667 5 лет назад

Great video Brad!!!! The content balance of technical amplifier work and then a performance to match the style of amp that's been across the healing bench. Superb!! Big love from John in London, England.

@johnfishleigh9627 6 лет назад

Oh no! Another bad solder joint. I ran into my first today. A garage sale garage door opener for $30 . Intermitently shut off so i hit it w ith a paddle when it fails and has worked for the last 9 months. Now that weather is better took a look at it. Nothing visible but pushing on circuit board made it work. I suspected the connector and cleaned and bent pins to no avail. Gave up and reflowed all larger solder joints ( for relays and connectors ). There was no sign of a cold solder joint but now works perfect. I never would have done that except for all your bad solder videos. Thanks for the good show

@mstecker 6 лет назад

There's something about the chords at the turn that slay on this song - and you nail it.

@mooseteets 6 лет назад

still loving the vids, you've really upped your game with the new equipment, i like it :D

@michaelmitchell5909 6 лет назад

Dude, a million thumbs up for the song at the end!!!.... U did Jim proud my brother!..... Loved it man!

@TheGuitologist 6 лет назад

I was a dead Indian in a past life.

@umajunkcollector 6 лет назад

and Robby!

@michaelmitchell5909 6 лет назад

The Guitologist ....awesome response man!.... Funny shit!

@KevinBingham 6 лет назад

Love the titles at the end for "Love Me Two Time" and "Washburn Dumpster Guitar".... and a great cover of the song! Keep up the goodly work!

@sandyeloff9678 6 лет назад

Hay Brad, I love watching you videos . they take me back to 1969 , when I was repairing and building guitar amps. growing up, my room was nothing but guitars and electronics. funny you do things almost the same way I did. you do need a set of nut drivers, lol. now I mostly build and repair guitars and condenser mics. still love tubes. good work, thanks steve

@w13rdguy 6 лет назад

Sounds good. You can usually figure out those iCs if you're lucky enough to find the number still legible on them. You can then look up what voltage belongs on what pin. Also you can check how hot they are on the surface to get one more clue. (Knowing Brad knows this, for the viewers.)

@AMStationEngineer 6 лет назад

For what it's worth, Brad, I enjoyed the hell out of this video. "Love me two times", was spot-on, and a great bonus! I'd have probably completed the repairs in much the same manner that you did, boxed it up, dragged it to the UPS shipper, then turned around after deciding that (under an anal-retentive impulse) I needed to build and install a custom wiring harness, and add a new set of Eminence speakers, and Radian horns, and while I was at it, juice the outputs a wee bit (I didn't know that they manufactured semiconductors in Morocco). Then I'd have lost my tail on that repair! For two years, '78, and '79, (and maybe a little of the way into '80), Weller -- Xcelite made a set of nut drivers (5/16 thru 11/16) for potentiometer removal and installation. They were equipped with really high-end Silastic seats for the shafts, and a 1-ounce tube of silicone conditioner for the seats. They were $35.00 per set (pricey), but surely would have come in handily with this project.

@garymanis6305 6 лет назад

Hey man, thanks for the video. It helped me identify a pair of circuit boards I received in the box with my Fender Cyber Twin chassis. The previous owner thought they were from a Marshall. They are identical to the boards in that Dean Markley. Mystery solved.

@douglasader2458 6 лет назад

That looks like a 22 bird shot round! I was an auto electriction 17 years have seen live rounds in fuse boxes before. Fun when you have a repeat bad short. Love your videos. Keep it up! From Doug

@eldredjoyner2556 5 лет назад

I have a Dean Markley combo. I like it a lot for a solid state amp. This amp when working must sound good. If I saw this amp, it would be an easy sell. Man, I love this channel! Thank You Brad!!!

@BrewerShettles 3 года назад

Took my Peavy Backstage Plus 35 W Amp apart - cleaned the circuit board (QTips soaked in liquid soap + water) - looked at all solder joints - applied a few drops of liquid flux / resoldered four (4) joints holding the Guitar Input switch to the circuit board + bent in the metal tip part of the switch to make sure contact happens when guitar cable is inserted. Resoldered one of three wires from the transformer to the board. Fixed!!!!!! Including Spring Reverb!!! Thanks for making this video!! Good aggressive Doors Jam. Still might need a new switch but at least it works!!

@TheElrondo 3 года назад

Even it's an old vid, i luv it. Still have that same Amp sitting somewhere. I also own a Dean Markley K75 guitars Amp, wich was one of the best designed Sud State amps back in it's time. Dean Markley made some real well made stuff, way ahead of the Fender solid state amps back in the early 80s, i still have it as a kind of backup and it takes pedals well.

@daviddunkin7454 2 года назад

Dude, never mind your repair ability, great cover of the doors!

@barrychristiansen4579 6 лет назад

all right Brad you got me laughing off my rocker. lol. rather well done for an ol tune i was delivering papers to door steps when that one hit the charts.lol

@MrGTO-ze7vb 6 лет назад

Very good Brad..!! That electronic microscope has opened a new avenue in problem solving.! Love The Doors... didn't know you were the second coming of Jim Morrison..!!

@TheGuitologist 6 лет назад

Actually, I was Jim Morrison. Don't tell anybody. I don't want to be hounded by groupies.

@jessemontano762 3 года назад

Hell yeah. Excellent cover doors one of my favorite bands

@Ron_Padgett 6 лет назад

Nice man! Great performance at the end!

@SentientSeven 6 лет назад

Glad I stuck around to the end, that was fantastic :)

@johnthrelfall5 5 лет назад

Great video , and very popular! Good educational video for technicians and guitarists.

@williambock1821 6 лет назад

I had fun sitting in the pot and playing triplets along with your love me two times rendition! Densmore triplets are always a blast.

@dlunsford1980 6 лет назад

I have been doing work for a consignment music store here in town and this type of gear is 90% of what I repair. Not near as fun as the old tube amps but it does force you to get creative with troubleshooting since schematics are almost always unatainium.

@paulwyer3397 6 лет назад

dlunsford1980

@rmakela27 6 лет назад

Good day. Thanks for the great videos. Constructive feedback, maybe keep the blinding work bench light off when the camera is on you and your workspace. I still see spots 😊

@Nazzz65 5 лет назад

I said it before and I'll say it again you've got a really good voice man. You should do some more tunes on your channel. Nice Doors cover!

@lousekoya1803 5 лет назад

Awesome !!!...................Love your channel !!.....Great singer by the way !!

@audiotechlabs4650 6 лет назад

Take a breath! What a great song to end the night with! Great cover! Your bench test was a success. The up-close camera beats just a lighted magnified light. Good repair? Thanxz

@kerrybayton8356 6 лет назад

your full of surprises.. I enjoyed that very much..

@deepwater2652 6 лет назад

Great trouble-shooting vid and BONUS performance from the Guitologist!

@thespiritof76.. 3 года назад

I hadn’t thought of that in years, but every house I lived in until I got married had a fuse box. Some were glass screw ins, the larger amp fuses were like 12, gauge shotgun shells that were brasses on both ends... the 220 outlet seem to use a pair of those

@steveparkes1 6 лет назад

Love it!! great song and performance.

@Abombsucksalot 6 лет назад

Love your content man especially the repair vids

@yigithicylmaz774 5 лет назад

chorusing white noise is so beautiful.. should definitely use on my new post metal album...

@scottm121 6 лет назад

AWESOME man.. love the outro too. Haha cheers from victoria

@EdDanaGuitar 6 лет назад

Ha! That was super interesting! I dig the microscope! Love Me TWO TIME LONG TIME! I'd advise them to replace those crazy speakers!

@kristopher6031 5 лет назад

Brad live at The Bench. We need a DVD!

@DavidBrown-it9ig 6 лет назад

Ahh Dean Markley amps! I remember testing them out at my local music store when they first came out. I remember the 60 and 120 watt tube heads sounds pretty good. They pushed them pretty hard for a while then they just faded away.

@TheGuitologist 6 лет назад

I don't remember the tube heads.

@DavidBrown-it9ig 6 лет назад

I think Sammy Hagar used them for a bit.

@telecasteroil 6 лет назад

Great closeups and pretty decent audio . Cheers from NY

@SkyscraperGuitars 6 лет назад

Well, sounds like you nailed it. Hopefully that does the trick. I enjoyed the microscope portion of the show.

@chrisjeneson5091 6 лет назад

Well worth watching if only for the version of Love me two times! Thanks Brad.

@alecjahn 6 лет назад

Loving the microscope setup. I don't envy you for diving into this one. Whew!

@alecjahn 6 лет назад

Also didn't expect that rear speaker on there. Reminds me of the passive radiators on the backs of some old Klipsch stuff.

@JustChiminin 6 лет назад

Damn, now I feel like listening to the recording . . nice job!

@barnabywilde374 2 года назад

just today i opened a customer's (bad audio) Bogen GS-100D amplifier ... it's not only all ICs, but they're of the SURFACE-MOUNT variety! Glad i'll be retiring next year.

@01left 3 года назад

Man what a Great Voice !! Love it

@paulkerr2298 6 лет назад

and that is why the lizard king never really died.. loved it mate,, made my day.... encore, encore. keep well dude

@weaesq 6 лет назад

The chips are likely to be operational amplifiers (op amps) in analog filter circuits.

@mischef18 6 лет назад

Yup it works. Nice bit of wrench'n there bro even though it is electronic, song did not put me to sleep anyway, the doors rattled a bit, lol. ATB

@jeff7807 6 лет назад

Great video Brad

@pamparitas 6 лет назад

souds nice :) a year ago i recap a litle K15 sounds nice for a small transistor amp

@johnseymour5223 6 лет назад

Awesome repair video Brad!..but I don't think I seen/or missed where you checked to see if the impedence was correct with that extra speaker/s that they had cobbled together.

@TheGuitologist 6 лет назад

It was correct when I put it back. I believe it was correct when I got it too. Looked like a dog's breakfast, but worked as intended, I guess.

@rockinchairboogie3222 6 лет назад

Brad, I really enjoyed the video (as I always do), I have an recording studio and let me suggest a Rode tube mic. The NT-1 is very good and it won't break the bank either. It is under a grand, around 600. or 700. and it is what your looking for bro. Good job on the song. I'm not a big Doors fan but I really liked your version of it. Take care... Jeff G.

@bryandraughn9830 2 года назад

I wish I could have you working on one of my amps so you might take a look at this other one. It's a Yamaha "fifty" 112 and just goes fft....fft....FFFFFTTTTTT!!!!! lol! for now, it's a spare speaker. ill get into it someday. It's pretty old, but it looks like a killer amp! Great videos man!

@eetechtom 6 лет назад

Love that “fuse”, and I thought gum wrappers were bad. Sheesh

@GtrMan863 6 лет назад

nice work on the repair and the song

@imdais 6 лет назад

Loved the performance!

@farmallpaul4518 6 лет назад

You rock! Come back and tell us how the extra speakers were wired?

@francisskundaliny1295 6 лет назад

great performance brad-rockn rolly!

@TheGuitologist 6 лет назад

Thanks, Francis.

@bessiebraveheart 5 лет назад

Hi from England, go on son, make em have it.

@pcbullets8726 6 лет назад

Liken' the microscope for the repair. You can really see what you got goin' on there. Great job on the Doors tune!

@hogie1259 6 лет назад

5 thumbs up for the performance Brad!

@youbecha64 6 лет назад

I enjoyed the Doors at the end!

@larrydering1598 5 лет назад

Nice work on this. Love that microscope. Cool Doors cover.

@jcspaziano 6 лет назад

Smashing that Doors tune man!!

@mrc6032 5 лет назад

That doors cover was awesome!😀

@johnstitt2615 6 лет назад

A repair and a tune. Nice.

@tonepilot 6 лет назад

Love the passion.

@jdbertel33 6 лет назад

Goddamn Brad. Hell of a cover there!

@topfloorstudio2684 10 месяцев назад

Where did you get your capacitor tester? I like that, is it custom built? Great vid Brad!

@richardturk7162 6 лет назад

Well done Brad .

@grahamthorpe4256 5 лет назад

wow rock on mr Lindzy id do some SVV stuff im teaching myself pride and joy

@ranman58635 9 месяцев назад

Question, I'm I'm tearing down an old tape deck from the 70s and I plugged it in to see if it worked and I wonder if I need to discharge something before I go putting my fingers on stuff? Thanks.

@Savage_Riffz 6 лет назад

Dude why are you not doing guitar covers on RU-vid? I love your content and would watch your covers whenever you put them out. Killer doors cover man!

@TheGuitologist 6 лет назад

I put a bunch up when I first started doing YT. No one ever watched them.

@icenesiswayons9962 5 лет назад

You do yourself proud, 2 thumbs up!

@1980bwc 6 лет назад

Love hearing me some Morrison. The dumpster special turned out pretty groovy.

@TheGuitologist 6 лет назад

Headstock's still hanging in there!

@STAY-GOLD-VINYL 6 лет назад

Very cool Doors rendition!!

@mal2ksc 6 лет назад

I don't think he stopped to check if the last phrase was in his (non-falsetto) range or not before he started, though. I don't think his throat appreciated that very much.

@432b86ed 3 года назад

might I suggest a nutdriver or deep socket for the pot retaining nuts? I guess the knobs will cover the scratches to the faceplate.

@DG-ic9ub 6 лет назад

Nice Doors jam, sounded great

@stavrost6559 6 лет назад

Hehe thumbs up for the song man! Thanks for your video

@nellayema2455 6 лет назад

Looking for an open guitar case where I can toss in a dollar or two. Good performance at the end!

@movinginstereo40 6 лет назад

Ahhhhhhhhh, The Lizard King Lives in Brad’s basement. That was bitichin. Thanks for posting the vid. Curtis

@jimhough6233 6 лет назад

YOU ROCK, BRAD!

@eaze78 6 лет назад

Awesome rendition of the Doors.

@nevanet 6 лет назад

Great version of Doors there! I play that song with my girl friend quite often :)

@thePsychoDuddy 6 лет назад

haha, the doors thing rocked.

@stargatewv 6 лет назад

oh yeah man...that's a first time ever (I can remember anyway) I've heard that one covered. cool man! Justify..able video!

@daveogarf 6 лет назад

NICE rendition of "Love Me Two Times".

@justinbouchard 6 лет назад

Sometimes when you are doing some shredding on electric after a repair, I'm thinking....Bradley Govan... Lately with the acoustic and singing your just deadly. Tons of Canadian bush love to you brother.

@TheGuitologist 6 лет назад

haha..."Bradley Govan" made me laugh. that dude is on another planet.

@justinbouchard 6 лет назад

Lol, I know but sometimes your legato shred is pretty effing amazing man!

@TheGuitologist 6 лет назад

I think I could use me some of that "Canadian bush love".

@justinbouchard 6 лет назад

Oh buddy. You better take your wife camping one summer up here. Bring her back to a commonwealth country and the bush love will be unstoppable

@michaelreis8266 6 лет назад

Love the Doors and the flashbacks they bring, great song choice Brad! I don't know who Bradley Govan is and you totally lost me at Canadian Bush Love!! But I ain't picky i'll take em bushy or bushless LOL

@toddjones5382 5 лет назад

You are a hoot brother.. Great job!

@TheGuitologist 5 лет назад

Thanks, Todd

@k7jbl157 5 лет назад

Great job...Jim. ;-)

@patreidcocolditzcastle632 8 месяцев назад

nice bit of doors at the end.great song.ive a fender acoustic amp to fix this inspired me. it has noise but if i hit top of amp it stops..any suggestions welcome

@davidsotomayor8713 6 лет назад

@The Guitologist I've seen people pull that shit with the pennies! They're crazy! Especially given the fact that if the house is old enough to have fuses it probably still has the original flammable cloth wiring. Reminds me of these guys that rip the ground prong off of their A.C. jacks. Also kinda reminds me of a friend who lived in an old house with fuses & bad wiring. We were jamming there and our bassist had an original SVT. He ended up blowing 2 transformers and 2 sets of power tubes because 2 of the phases were swapped. After the 2nd time I figured something was wrong and tested the outlet and found it was wired wrong.

@scottriddle5468 6 лет назад

Ha ha good tune man . Watch out for the snapping snatch.

@russellhltn1396 6 лет назад

I'm a little surprised the added speakers didn't create an issue. One thing solid state amps have very little tolerance for is a speaker impedance that's lower than the amp's minimum. A number of stereo amps I fixed was due to the owner adding speakers to their setup. The two Pyramids are 8 ohms - which is fine if the amp can handle 4 ohm.