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FDP Forum / Fender Amps: Vintage (before 1985) / 1972 Twin Reverb Silverface

Mr. Mac

Argentina

Mr. Mac
Dec 12th, 2016 09:22 AM   Edit   Profile   Print Topic   Search Topic

Hi folks I'm new to the FDP forums and this is my very first post! I just wanted to share a thought on this one.
First I must say, I bought this amp in immaculate condition! I contacted a musician guy who travels around the world searching for this kind of stuff.
It is a NOS amp, I would love to share some pics...
All original, the valves, caps and speakers. It has the old underlined logo and the master volume is present but it's not a push-pull. It has Oxfords (some people call them "oxfarts") but at the time I turned on this thing, waiting a while for the tubes to warm up, it sounded like heaven!
I must say in fact I was searching for a Vibrolux but the guy sold the one he had and he offered me to try this instead. He gave me a SRV signature and man when I threw some chords the oomph of the amp took me instantly to the Twin realm...
I was searching for Fender cleans but with creamy end and for that reason I was trying to avoid those with the ultra linear transformers. Of course my first option would be the BF version but the guy only had a '65 Bassman (fair condition) which is great but too big to carry around. And also it was quite more expensive of course, out of my pocket boundaries.
I had in mind an advice of a music store worker in where I was trying the new version of the Vibrolux ('68 custom) which I liked, but needed to try some more amps and the seller told me to find one SF instead of a reissue. Well I needed the best possible cleans (I'm a Marshall's lifetime user)so I needed to add "the other side" of the sound. Plus, this amp takes pedals wonderfully!
Since this kind of opportunities doesn't present often here I just wanted to know your impressions or experiences with this amp. Thanks!

willie
Contributing Member
*******

Too Near Atlanta GA

Amp Tech Emeritus
Dec 12th, 2016 12:27 PM   Edit   Profile   Print Topic   Search Topic

Congratulations on your new amp and welcome to the FDP.

If your Twin Reverb is a '72 I would presume it has the master volume on it. This model amp is sometime maligned since the folks at Fender/CBS tended to go a bit off the beaten path with the tried and true Twin Reverb design. Of course, in 1972, folks were not looking for clean as much as they wanted overdrive and distortion...so Fender decided to add this master volume with a booost which wasn't a really good idea but it kept them in the game. Beyond that there are a few components they changed that some (including myself) believe tended to remove some of the sonic beauty of the amp as originally conceived.

Now...these are fine amps...more powerful than the BF and early SF Twin Reverbs. They are dependable and work well with pedals and such. One thing I might mention is that if this amp is truly NOS and has the original electrolytic caps in it, they need to be replaced as soon as possible. Filter caps are not like wine, they don't get better with age. :)

Again welcome to the board...

w

Hammond101
Contributing Member
**********

So. Cal. USA

Dec 12th, 2016 05:40 PM   Edit   Profile   Print Topic   Search Topic

Very cool! As a 70s TR owner I welcome you to the fold. It's hard to beat a TR live and it's one of my favorite "living room" amps as well. My amp is a '75 and mounted in a Dual Showman Reverb head cab. I use a Fender clone 2-12 cab with it.

I have black faced the circuit but kept the master volume. I also have no boost. The amp is clean, warm and loud. Takes pedals well and is a hoot to play when I can take it somewhere large enough to give it a workout.

I have a vintage set of Gause speakers in the 2-12 cab. Very JBL like in performance but handle distortion much better.

Willie knows his stuff, a retired tech from the repair industry. Get those filter caps changed if you plan to play this thing as he suggests.

jazzguy
Contributing Member
*********

Philly, B-3 Capital

don't dream it be it
Dec 12th, 2016 10:06 PM   Edit   Profile   Print Topic   Search Topic

ok boys and girls,
this thread has been checked in w/2 superb techs already.
listen [read] learn....


Mr. Mac

Argentina

Mr. Mac
Dec 13th, 2016 03:49 PM   Edit   Profile   Print Topic   Search Topic

Thanks for the advices guys! and of course I will have them in mind. Right now the amp sounds sooo sweet! Amazing for a 44 year old that it doesn't make noise at all...and the cleans on my strat are deep and crystal clear...
Should I expect artifacts or some to replace the caps? I mean the sound right now is spot on for my ears...

Hammond101
Contributing Member
**********

So. Cal. USA

Dec 13th, 2016 05:18 PM   Edit   Profile   Print Topic   Search Topic

Old caps can sound good one minute and literally come apart the next. No hum may be noticed even if the cap(s) is/are getting weak.

The power supply could be getting mushy but you may mot notice this unless you really push the power section. It take lot of volume to get there with a Twin Reverb.

If you pull the chassis you can remove the doghouse cover. DON'T TOUCH anything unless you discharge the caps and know how to do so. If you see any bulges or lumps on the ends of the caps they are on their way out.

As above even though this amp has little time on it the filter caps should be changed due to age.

Mr. Mac

Argentina

Mr. Mac
Dec 14th, 2016 05:52 AM   Edit   Profile   Print Topic   Search Topic

Thanks for the tech advice Hammond101 I will take the amp to a tech soon to make sure everything is ok! one thing more I'm curious about the blackfacing mod...is that much difference sonically? I guess Is it taking the amp from 100w to 85 or 65w? with that mod you can make your SF sound exactly like the BF? how would you put new BF reissues vs blackfaced SF? and last but not least can you do that mod to later Twins? (I've got a friend who has the infamous 135 UL TR...
Thanks again! :)

j!mi
Contributing Member
***

NNJ

and meanwhile, I'm still thinkin' . . .
Dec 14th, 2016 07:44 AM   Edit   Profile   Print Topic   Search Topic

I have a 1971 Twin with no master volume. I did the Blackface mods outlined in Gerald Webers book and honestly didn't hear much of a difference. I added a bias pot to the hum balance circuit and the 1 ohm resistors for easy output tube biasing. The biggest sonic difference came when I added a quartet of JAN Philips 6L6WGB output tubes. They made the bass thicker and more robust.
The Weber California speakers with the paper dust caps are what's recommended for that amp.

Hammond101
Contributing Member
**********

So. Cal. USA

Dec 14th, 2016 09:44 AM   Edit   Profile   Print Topic   Search Topic

The claimed 100 watt output of the Silverface TR is really just a number. Basically the same as the 85 watt BF TR. The way they are put together in the phase inverter and beyond, they are a bit cleaner than the BF amps. It was a numbers game in the 70s and Fender made the claim of 100 watts starting with the master volume amps. They are 80-85 watt amps just like the BF from any bench test I have ever rum.

In reality a SF MV Twin with the master on "10" works just like a BF Twin. Personally I like the warmer BF Power section so that is the way I did my '75 TR but retained the master. It is very sweet with the both the master and Trem channel volume set on 5. A bit of clean headroom is lost in the BF mod. Not a bad thing unless you play steel guitar through it and want huge clean loud.

The 135 watt UL TR is best just left alone to be what it is. A loud, clean, and sometime brittle amp (in the wrong hands). It still take pedals well so what the heck. I have one I maintain for a local player. Nice amp actually. The dollars spent in modding a UL Twin to BF specs would be prohibitive IMO.

Just my personal opinions here so YMMV.

Mr. Mac

Argentina

Mr. Mac
Dec 15th, 2016 06:23 AM   Edit   Profile   Print Topic   Search Topic

Great to hear thoughts from experienced people! well I have to say with all the advices I contacted to my amp's vendor, about the caps (I'm not a tech guy but I'm learning day by day) I asked my seller about the caps and he told me when he brought the amp the caps were restored by an expert tech guy. I know there is a way to do that so I remember the guy told me something about it when I was testing the amp but my mind was somewhere else enjoying the sound lol. Thanks!

Hammond101
Contributing Member
**********

So. Cal. USA

Dec 15th, 2016 09:13 AM   Edit   Profile   Print Topic   Search Topic

I understand how you feel however there is really no way to "restore" a cap short of replacement. If the amp had been sitting for many years the seller or someone may have brought the line voltage up slowly with a Variac to slowly reform the caps however that is not a repair or restoration just a safe way to bring a vintage tube amp up to power after years of no use to prevent cap damage.

Mr. Mac

Argentina

Mr. Mac
Dec 15th, 2016 02:00 PM   Edit   Profile   Print Topic   Search Topic

Thanks again Hammond101! Now I know where I'm sitting and fully aware of it's condition, for the moment that I need to take action. I need to say also people complaining about Oxford speakers but they sound beautiful to my ears. Maybe I'm not that experiences but I've been trying some with Utah and Eminence, all of them sounded great.



keithb7

Canada, Kamloops

Vintage Amp Hoarder
Dec 18th, 2016 12:24 AM   Edit   Profile   Print Topic   Search Topic

1973 Twin Reverb owner here. With JBL K120 speakers. Awesome amp! I did a full service myself. One of my lifetime favourites.

pcalu

usa metro detroit

Feb 25th, 2017 07:31 PM   Edit   Profile   Print Topic   Search Topic

Just picked up a 75 Twin Reverb in mint condition and a 74 Pro Reverb also in mint condition! Like they were just pulled from their cardboard boxes.

I play a huge amount of Country and Blues and Jazz using Telecasters.

I can't think of a better amp to play traditional country. Twins take pedals awesome too.

Power stoked!

The Pro Reverb is going to be my Blues amp.

Going to take them ASAP to my amp tech for maint...

FDP Forum / Fender Amps: Vintage (before 1985) / 1972 Twin Reverb Silverface




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