Power Tube SCREAMS Like a Monkey! - Fender Twin Reverb Service

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This is a later 1978 ultra-linear (UL) 135W Silverface Fender Twin Reverb that has extensive servicing and mods done before me, but customer complaining of noise and "glassiness" in the tone. We'll open it up and look at the mods done, and we'll eventually diagnose the problem down to bad output tubes, listen to one of them squeal like a tortured primate on command, then change tubes and rebias.
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20 мар 2017

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Комментарии : 300

@manawarrior2010 7 лет назад

"Crack the son of a bitch to ten and shut the hell up about it." - You just won yourself a Subscriber, my friend.

@TheGuitologist 7 лет назад

Sorry for the late reply, but thanks and welcome aboard, Gareth.

@DigBipper188 7 лет назад

Personally I LOVE having that master volume there... it means you can drive the absolute hell out of the primary stage and not bring down every building within a 30 mile radius and have multiple nations filing noise complaints to do it.

@TheGuitologist 7 лет назад

...and know something else...I was toying around with the pull boost on this example and was getting some really nice overdrive out of the amp. It took a while to EQ it and dial it in, but it did a half decent job of breaking up.

@DigBipper188 7 лет назад

That's something a lot of Fender's amps were renowned for (and still are)... amps like the BluesBreaker, Bassman, Champ and the twin 'verb can make some super nice drive tones when you dial them in with a super hot signal!!

7 лет назад

Bruce Gerard Is it true though, as a rule of thumb, a master volume feature is more effective in lowering the output level than the attenuators dropping the overall wattage??

@NicholasGreen91 5 лет назад

I love it too. You can't practice pedal steel guitar on one of these with your highs disappearing. The Master Volume on this basically also serves as a treble bleed. Its wonderful for getting some harmonics at a lower volume. Lord forbid :) Just don't pull the volume knob outward ! lol!!

@comicblueswithjonygitar36 4 года назад

You can't use it on small gigs, i tried for years, the tone just isn't the same as my deluxe opened up, doesnt project or scream, this amp needs the master on 4-6 to sound like itself, which on a big gig, bar full of ppl, but don't think you can go tp a coffee house and put 1st stage on 10 and master on 2, it sounds terrible like that. Back in the seventies and eighties they used to do a gain boost where they essentially take the knobs for the speed and intensity and make that into Volume 2 and master and so it's like a boogie that one you can get a decent tone but it's still not with a twin sounds like a twin needs to be on 4 to 6 to really bleed and sound good

@bakerXderek 7 лет назад

I LOVE the tone in those, your vids are addicting man !

@jamesdavies3226 6 лет назад

bakerXderek the fact that I keep finding you on guitar videos makes me like your channel better.

@BarnegateBoys 4 года назад

I own one of these. Bought it brand new and still have it today. I did go through speakers in the first few years. Finally put EV Force speakers in it. Now it's even heavier. I had to put bigger wheels on it. The amp still kicks butt. I never turn the master past 5 and it's still loud as hell. My favorite amp.

@MatthewMcClellan 2 месяца назад

Thank you. As the owner of a ‘79, this was very educational.

@jopestv1063 5 лет назад

Another great vid, dude. I had to downsize in the late 90s from a Marshall 1959 to a combo. Got a Twin blackface reissue and never regretted it. This amp brings out the character of any type of guitar you run thru it.

@vmc37 6 лет назад

Your channel is a great resource for aspiring students of guitology like myself! Thank you! Appreciate your humbleness to admit you’re not an expert but still have an opinion. A lot of stubborn people when it comes to gear and there ears.THANKS

@AstronotMusic 7 лет назад

Started watching your videos recently and find them really interesting. I'm not that technically minded, but I still find this kind of thing fascinating. On this video, I almost pissed myself at the "looks like someone jizzed in here" part haha. Keep up the good work.

@contrabandjoe7974 7 лет назад

I'm with you on the silver face master volume thing.. As well as a lot more along the lines of musical gear snobbery. The tone differences in some of these amps (vintage, late vintage or otherwise) is often so small (talking expensive amps and vintage) that how much is really discernible by the human ear??? Think about why we musicians have these tools? to make music!! Do any of us think that our audience while listening to us play make comments to each other such as "Oh my god, listen to that guitar players 78 silverface, that master volume is really negatively affecting his tone!" LOL

@TheGuitologist 7 лет назад

@audiotechlabs4650 7 лет назад

ContraBand Joe You are correct, sir! The person who likes your guitar playing, says "Turn up", the person who is not impressed says, "You're too loud"! They don't know or care what amp you're using. Thankz

@timclary5614 7 лет назад

nom nums

@PhilGa 7 лет назад

I don't know how the whole SilverFace hate started. Was it in the 70's, when the Blackface era amps were still pretty fresh of the factory? Or in the late 90's - early 00's when people started buying these heavily modified SF, nowhere near the original state and passing the word on the internet of ''how bad they sounds'' ? The biggest mistake you can make with a Silverface Fender is to compare it to a Blackface. It is not the same amp hence the different EQ, hence the different Tone. I own a 1977 SuperReverb with Master Volume and Ultra Linear Schematic. Even if this is considered an ''inferior'' amp in the Fender legacy, I still dig it a lot an play it much more than my other Blackface. You can dial really great tone from it and the Master Volume is pretty useful for late night practice.

@JamesMcCutcheon 7 лет назад

I purchased 74 for my son years ago its a great amp for gigging. Only did a little restoration and new tubes rebiased and its good now still great amp The master volume is really handy.

@RandySchartiger 6 лет назад

cool video! just finished replacing power tubes in a twin, these amps rock when they're right. thanks for sharing.

@MichaelDonlinAwesome 6 лет назад

I'm not sure how you make amp repair mesmerizing, but ya do. Thanks for sharing.

@skycarl 7 лет назад

Lotta fun following this one Brad. Gotta love it when the Tele comes out. Good stuff as usual pal.

@TheGuitologist 7 лет назад

Thanks, Carl.

@scottbee501 2 года назад

Love tube amp videos! Thanks man. I had a Twin in 1974 but it was older than 74’ and it was clean and loud but “Balsey ”. It took pedals well.

@dariusliadon 7 лет назад

Lovely playing in the final demo Brad, sounds great!

@TheGuitologist 7 лет назад

Thanks, Darius. I appreciate that, man.

@SDPickups 7 лет назад

I had one of those when it was new, AWESOME AMP! It also had some kind of push pull knob that I don't remember what it did. Only reason I ever got rid of it, was it weighed A TON! One time dragging it to band practice and I was done with it. Regret it now.

@mushroomsamba82 7 лет назад

man that tele sounds great no matter what it's plugged in to

@MrJohnnyDistortion 5 лет назад

You're correct. I plugged one into a Flowbee and it wss incredible.

@coopercummings5170 6 лет назад

Found a 76 twin reverb in a guitar center for a good price. No one was paying attention to it and I played through it and got the whole stores attention. I walked (wheeled) out with it.

@TheGuitologist 6 лет назад

Those were engineered to move air and get attention.

@coopercummings5170 6 лет назад

The Guitologist they are severely underrated amps and a great deal. Nice Tele though

@lindseymontana945 7 лет назад

I admire your endless creativity, coming up with uncopyrighted (or seemingly uncopyrighted) material to demo your amps. It must be a pleasure to hear you at your gigs for those of us who value improvisation over rehashed versions of recordings.

@TheGuitologist 7 лет назад

Well, I don't do gigs anymore really, but thanks for that. Yeah, I usually don't play songs in these demos. I just dork around and see what comes out. Trying to play to the equipment's strengths really.

@StopMoColorado 6 лет назад

The Guitologist - I second what Lindsay said. I'm instantly turned off by gear demos that become wanking sessions/shred-fests. I want to hear the pedals/amps/guitars, etc., and it's easier on the ears when there's some space in the playing, and when one doesn't have to hear the same over-played guitar cliches over and over 😁

@blkjckgtr3075 7 лет назад

Hi there at 15.55 theres a broken blue wire!Its wrapped arround white wire,Cheers!!

@hatta1991 7 лет назад

I own the same AMP with really all things stock (includes the Caps) and I love it als hell. This tone, this great Sound this Amp has, is the best i've ever heared. And it stays clean until the whole building I'm playing inside is destroyed :D Loud as hell and clean to the bitter end :)

@graxjpg Год назад

awesome stuff, you always get these things right.

@deepwater2652 7 лет назад

I enjoy these videos of your working through the diagnosis of what is causing particular problems with these amps - learning a lot about what makes these babies tick (or stop ticking). Also interesting to see the "innards" of some of these classics from back in the day! Keep up the good work!

@Rialas 5 лет назад

Best amps ever. Stick a fulltone ocd in front and it blows away anything.

@Riffraff12571 7 лет назад

Nice thorough job going through everything in that amp and sniffing out the root cause of the problem. The best take away for me was that little ditty you played at the end that inspired me to sneak off to my jam room at 4 am and plug my Tele in. Great little riff man! God bless volume pedals in the EFX loop, haha!

@TheGuitologist 7 лет назад

In hindsight it reminded me of some 70s soft rock, like maybe some Carpenters or something. :)

@crazyuncleduke8012 7 лет назад

Great vid Brad! This one reminds me of a late 70's Silverface Twin MV that came to me many moons ago for a tube change and bias. Had the same type of cap changes and the use of snot in various places. Only difference is it had two EL 34 power tubes. All I can say it was a screaming banshee of an overdrive amp. Sounded like a cranked Marshall JCM 900 when the volumes were only at 9 o'clock. Always wondered who the mad scientist was who did those mods.

@TheGuitologist 7 лет назад

Someone really hot rodded that one, by the sound of it.

@stevecrooks2605 7 лет назад

The Guitologist Are you an Oliva Serie V smoker? :)

@LeonidasLost480 Год назад

I lost track of you man. Really like the way you talk to us like we were in the workshop instead of Ireland

@TheGuitologist Год назад

Welcome back! Glad you found me again. I’m still making videos every week.

@garyeggleton1142 7 лет назад

that was a great video Brad....I learned alot

@stupidjubei 7 лет назад

I'm not sure about headroom or power, but the harmonics after you tweaked it were great. Thanks for these videos! Just discovered them, and they're great!

@TheGuitologist 7 лет назад

Thanks for watching and taking time to comment!

@marksc1929 5 лет назад

...my daughter does PR work for Derek Trucks ...so I was able get his tech to re work my 68 Pro Reverb .....gosh it sounds and responds great now ....

@bmorr6734 5 лет назад

Fine playing, Sir

@kenb.1829 6 лет назад

Past the time for me to subscribe, just did it. I rarely rant but this upload allowed me an opportunity. Mostly I just enjoy your handiwork.

@robertanderson5902 7 лет назад

Hey Bro Thanks for the wonderful Video and the sweet playing. Great amps had one and a Red Knob Twin. Both scremers

@TheGuitologist 7 лет назад

I personally think those red knob Fenders are underrated tone-wise. The ones with Chorus I thought sounded really nice for clean.

@genekloszewski5484 6 лет назад

good stuff, love my fender amps!

@jessehudson7113 3 года назад

Loved that tune at the end...

@twincam825 5 лет назад

Thanks for posting video the fender amps i work on with balance pot for bias i put a 15 turn50k trimmer pot in place of resistor then i can adjust balance and bias.Like your videos not staged live in action keep up the good work thanks oh great guitar playing also.

@brich2929 7 лет назад

wow, a new video! watching now!!

@lars-fenin 6 лет назад

love my 76 silver twin.. being a stable workhorse since 20 years !! but also have to change main tubes (hiss &noises) and some elkos (no voltage) now...

@audiotechlabs4650 7 лет назад

There must be some good sounding SS/modeling amps out there. There IS a difference between tube amps and SS! Whether they a MV or not. The main thing is that signature sound they both make. Tube amps sound much more musical by nature. I have a Marshall, a Silvertone, a Pignose, a Crate, and a 1957 Deluxe, all tube amps, they all sound different but they all have the tube amp tone! Even Vox's new $200 micro amp with a mini tube preamp has some of the tube sound. Tubes + guitar = tone! Thank you for listening to my rant. Thankz

@paulmandes4810 7 лет назад

I have a twin with the Master Vol. I love no problems. Even dig the analog overdrive, cheezie cool!

@jeffmclowry 5 лет назад

That is a nice sounding amp. Makes me want to purchase one.

@thomasbailey9605 4 года назад

phase inverter section modded. value changes back to "blackface" era. this helps these amps BIGTIME.

@matthewf1979 7 лет назад

The 60's Reverb transformer was made by Triad. In 70 or 71 changed to Schumacher (EIA606). Useless Fender amp trivia, the parts are identical.

@Donfleebie1 Год назад

I’ve still got my 72 SFTR I bought brand new. I haven’t used it in years. I really need to retune, bias, and have a new power cord added.

@strat-xq5oy 7 лет назад

most of the GT valves i've seen are re-branded sovtek......and fender too, keep up with these fantastic vid's + sub'ed

@TheGuitologist 7 лет назад

Yep, that's been my experience too. And funny thing is Sovteks were already pretty reliable, so buying GT is really mostly throwing your money away, in my experience.

@whatsstefon 5 лет назад

Are those filter cap values correct? 33uF seems wrong, and at 100V? Then those larger 220uF caps? Am I reading that correctly?

@theonemodifier 7 лет назад

this was very cool, thx

@1234rtyoip 6 лет назад

Where do you get your schematics with the voltages like that?

@dangluck4795 Год назад

Best STR bias how-to ever!!

@Halliday7895 2 года назад

my 1966 twin reverb is getting quieter and fuzzy on the softer notes like if you hit a harmonic you hear grit in the quiet registers

@Timanator 7 лет назад

What camera are you filing with, it's really nice!

@TheCsabi86 7 месяцев назад

I like that 'monkey' sound, it's so badass. :D

@hadleymanmusic 6 лет назад

I really liked the pro reverb that same age.

@thespiritof76.. 3 года назад

I had a silver face w/0 master once. It was a monkey too... Could run it at 9 and was quiet as mouse till you spanked it

@eLyKcs 2 года назад

is it normal for these amps to hum like it is in your video? i recently bought a 1980 twin reverb and getting hum like this one is. ty

@barrychristiansen4579 6 лет назад

thx. Brad. Good job.Halilujah!!!

@thomasbailey9605 4 года назад

wow.....thats double the filtering. 220uf vs. 100uf. Got that that tightened up! great amps!

@hadleymanmusic 6 лет назад

Whats the loudest fender like the pro reverb in a kit form?

@foxyrollouts 7 лет назад

Cool Vid, thankyou

@lwv6966 4 года назад

I have a '77 100 watt monster and love it (but not enough to carry it!) :) Where did you come up with a Tele with a filtertron?

@Dbj5555555 3 месяца назад

Love waiting for the monkey to start come crawling out

@armstronglance 5 лет назад

Dang! Never seen a silver face with that many replaced components. Got that right about soldering in cap with value not facing up. I have many mid 60’s fender heads, most aren’t working any more. Got a lot of work to do resurrecting them from the dead. Use to have all 60’s hi-gain RCA 6L6’s, but the wife knocked the box of them over onto a time floor. 😫 I’m thinking my 4 Dual Showman’s & Vibroluxes have 2.5 or 3amp regular fuses. I definitely power up my old amps with a variac while monitoring the current. I have opened up a blown transformer and luckily fixed it because a melted wire was visible.

@twistedlv 7 лет назад

Any idea where I might find a replacement faceplate for a silverface Pro Reverb of this approx vintage? I've got one that I'm trying to refurb cosmetically. The guts are best left to someone like yourself!

@green323turbo 7 лет назад

I've got a 90's black knob 'The Twin". How hard would it be to convert the clean channel to vintage twin specs ? The sound is very good now, but it would be nice to have it more vintage sound. What would you recommend ?

@djefferson5669 5 лет назад

Does anyone know the name of the location of the resistor below the screen resistor? And why not replace that one as well?? I'm talking about the carbon comp resistor below the screen resistor.

@michel333100 6 лет назад

Hi, just wanted to ask you a question. I have a 1965 Fender blackface amp that has a plate voltage of 684 volts on the plates. The AMP plays alright, but I am concerned as to why the plate voltage is so high. I have replaced the output and choke transformers. I've cleaned all the pots and I have changed all of the sockets for the valves to high quality components. Don't know though about the high plate voltage. I'm wondering if I should just get a whole new board. This board is very warped. I Don know if that is a problem as well.Thanks Michael Newell from Niagara Falls, Ontario, Canada

@samroth7634 7 лет назад

As for as I'm concerned it sounds beautiful pure tone! Love it!

@djefferson5669 5 лет назад

3:21 The bias resistor is normally on the wiper of that pot yes??

@jp040759 7 лет назад

Where is the model number of the chassis located on these units?

@fredweather3366 6 лет назад

Great stuff as always. May be time to throw some new strings on that Tele. Or are those Elixirs? The wound strings sound pretty muffled.

@cgavin1 4 года назад

The size of that power transformer! Good God!

@cgavin1 4 года назад

.. and I went out and bought one last week. I can't imagine a live scenario where I would ever turn it up past 6. Ever. So I guess its makes sense running it on the lower end of the voltages. Make them big bottles last 20 years..

@ThrashinYorkie 7 лет назад

It looks like one of the twisted pair (white and Black wires is not complete. The black one looks like it is floating above the board. At 15:55, just to the left of center, is the black wire in the twisted pair making contact?

@ThrashinYorkie 7 лет назад

Never mind, you found it.

@tubedude4859 2 года назад

I added a good 1000 jigawatts pedal to mine and it sounds fantastic

@green323turbo 7 лет назад

One problem could be the numerous wires soldered in different grounding spots to the chassis. Also grounding to the back of that matching pot could be a noise problem. Was there a wire that gounded the back of that pot to a common chassis ground ?

@theonemodifier 7 лет назад

my twin SF master vol is a pull knob, i hear a diff when pulled.

@Tonetwisters 3 года назад

Well. Give that tube a nanner! :-) I had my master volume removed as I did not want distortion. Two good amp techs said it was useless. So it went. I used mine to play weddings and some good old British Invasion music, with an ES-355.

@eugeneeaton7262 5 лет назад

What about the black wire that was cut just wondering?

@strumbum52 7 лет назад

This video brought back memories for me. I had a '78 Twin Reverb with orange frame JBLs back then and tried so very hard to like it. When Fender went to the 135W output and master volume the tone just wasn't there at usable volume levels. I used it on hundreds of dates, finally tried a Lab Series L5 amp, sold the Twin, and never looked back. Actually, the Twin did make a pretty good bass amp, especially with those JBLs.

@edwhite7475 Год назад

I had the same amp...i hated it...so damn loud and ice picky clean. The master volume didnt work for me either...at all. This one had had an ungodly amount of roaches living in it from the previous owner...dis- gusting. I kept the speakers, one for a bass cabinet , lol, and the other for an old Leslie...and put some old Celestions in it...which made it sound better. I finally sold it to a pawnshop for $ 350 just to get it out of my house. My 2204 Marshalls are so much better for me.... That Twin is more suited to a pedal steel player. I took a loss on it...i think i paid $550 for it, and about a year later i bought a Kustom, late 80s era, solid state model Twin Reverb style combo, way used, for $35. 110 watts 2x12s, reverb and tremolo, and way more suited for me. I just wanted that tremolo sound.

@skgate 2 года назад

Jizzed… lmao I haven’t heard that in years

@boreed5734 3 года назад

I have a '81 twin, the speakers been upgraded from the original but don't know if anything else was done I will have my amp tech analyze it. All I know right now is that this thing is extremely heavy and powerful. Are the early '80's twins really that much different from the late '70's?

@Ferretsnarf 7 лет назад

I just came from your recent Mesa video. First thing I notice when I see inside these old amps is "Damn what a rat's nest". People talk down at PCBs, but they sure do make life so much easier. I'd take a good, well laid out PCB over this mess any day. Sometimes I think people like things just because they're old. That said, to be fair, if I wanted to mod a circuit, point to point is preferable.

@Motleyguts 5 лет назад

I grew up with that amp, and later on convinced old dad to buy a second one. Both late 60s to mid70s depending on which part you looked at. Volume: 11 Guitar: 11 Master Volume: Are the parents home? Thanks for the video and trip down memory lane.

@GregPentecost 7 лет назад

LOL Please tell me I'm seeing things. I'm at the 16 minute mark and seeing the the second time what looks like a cut black wire. If you see the black and white twisted wires (2) in the center of the screen, it looks like the right side (on the screen) of the black wire is cut from its connection point on the board. Does this get addressed later int he video? I saw it on the first go through of the board as well. LOL Love my '74 Twin Reverb!

@viscioushattermaid4410 4 года назад

What’s the deal between hand wired and pcb board tube amps, tone difference? My blues deluxe sounds better than my ‘68 twin

@markchas4554 7 лет назад

Do you ever use a scope? By the way you play quite well.

@trapperjohn8481 7 лет назад

That sounds like my truck starting up.

@TheGuitologist 7 лет назад

hahaha...bad starter?

@brianmiller4207 7 лет назад

OMG!! I Love your videos I Laugh so much!!! You are Super smart and you say you're not then you start doing crazy math and I spit ice coffee all over ^_^ I did have a Fender Super Twin reverb (the first with computer parts) and it would crap out . It turned out to have a hairline crack in the motherboard..... I miss Tubes and wire ^_^

@RickP654 6 лет назад

Brad, I have a question for you. How do you tell the dates on tubes, transformers, and things like that? You was saying 1978 and 1977 and all I saw was a 7 or 8. I mean, wouldn't it be possible for it to be out of the sixties? I'm wandering, am I missing something?

@smudgerdave1141 7 лет назад

Oops. When you did the second calculation, you forgot to divide by 2. The power for the 34k resistor was about 8.25W. This should have become clear to you when you settled on the 20k value - you lowered the resistance from 22k to 20k and increased the wattage from 17W to 19.6W. HTH

@TheGuitologist 7 лет назад

Just saw this and yes! You are correct! Nice catch! So that original resistor was obviously there for the original UL strapped OT config, because it was WAY cold biased in this operation.

@audiotechlabs4650 7 лет назад

Wow! Very interesting! That resistor sub box is so valuable. Did Fender alter all of the amp line after Leo sold out and were there any that was altered the least? Like the Twin? Thankz

@TheGuitologist 7 лет назад

The least altered amp from the BF to SF era that I know of is the Princeton. Very few changes on that amp from BF to end of SF era. Most bigger amps had many changes including the UL operation which came around 1977 or 1978 and most players say they hate. A previous tech had removed the UL leads and rewired the screens on the output tubes in this example.

@beatleme2 7 лет назад

I have a Bassman 100 i modded for guitar and replace the high voltage caps ...sounds great with old JBL's in it

@guitarocd9984 6 лет назад

When I was a kid the goal was to keep your amp from distorting. That seemed to have been the goal of the silver face to stay clean at loud volumes That's why Fender missed the boat. I remember when Mesa Boogie came out. Fender was late to the Distortion game. Seems they never caught up. But they kept making them crappy silverface amps till finally somebody woke up at fender LOL

@ultimatemassive9501 8 месяцев назад

I've got a 69 Twin Reverb that I absolutely adore. It's one of my most prized posessions. It's pretty beat up, too heavy to gig with, and too loud to play at a reasonable volume at home, but I'll never part with it.

@justinjohnson1176 6 лет назад

Do you ever do videos of bass amp repairs? I would love to see the inside of an SVT

@TheGuitologist 6 лет назад

Yeah, I sometimes look at bass stuff. No SVTs yet.

@LPCustom3 7 лет назад

One of the best investments I made for my shop is the Orange VT-1000 Valve Tester. Get some better 6L6's and convert that O/P tube balance into a real Bias control. When that Balance control was used, you could get a lot better quality U.S. Made tubes vs that Ruby stuff.

@JesusIsLordofMybeing 7 лет назад

Hey Brad!! Thanks for awesome videos as usual. BTW, looks like someone intentionally cut navy blue wire at 3:05 in video. Lol Maybe someone was trying to isolate ground loops?

@hadleymanmusic 5 лет назад

Pro reverb had the pushpull about tthat year?

@lousekoya1803 7 лет назад

Awesome!!........Subscribed!!Any link to your amp repair place ?Tx

@emlyngriffith5846 Год назад

Great video. Very interesting 👍🍷. I know very little about amps and their electronics so most of what you said went way over my head. But I do have a similar amp….except it has “Pro Reverb” on it. I bought it second hand over 25 years ago and have played it at home ever since (using my Gibson LP and G&L ASAT). I’ve always loved the sound quality and have had no problems until recently when a loud hum/buzz sounds when I release the strings of the guitar. Unfortunately there are no amp repair people anywhere near me…..and now I’m so old I can’t move the thing! I don’t even know if it’s possible to buy tubes for it any more (if that’s the problem?) and if it’s possible for a complete amateur to replace them…..