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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 11:17 am
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Here are the power tubes, The fella i bought it from was sure they were original
All of the preamp tubes are Fender branded made in the USA

SEE END OF PAGE TWO for amp guts pictures !!!!

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 11:30 am
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Those are the world famous RCA, black plate, side getter 6L6GC.

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 11:35 am
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So what do ya make of those tranny codes on page 2 ???

Is it possible this is an earlier amp than I was told ?

A note inside talks about a cap being replaced in 1977

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 11:42 am
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Need to look at the tranny codes. That rectifier looks like a 5AS4, not a GZ34. GE or Sylvania didn't start making the 5AR4/GZ34 until later in the 1960's (not the "61" = 1961 code on the tube). Does the amp have slow turn-on or a little quicker --- like a 5U4GB powered amp?


http://www.radiomuseum.org/tubes/tube_5as4.html


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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 11:49 am
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The tube chart is 5U4GB and the original rectifier was a 5U4GB

I listed the tranny codes on page two here on this thread

Thanks !

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 12:25 pm
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I think the amp's a '77......last of the "real" Super Reverbs (they switched to the ultra-linear 70-watt platform the following year).

Arjay

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 12:27 pm
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That photo of the rectifier "looks" like bottle is a tad too short for a US made 5U4GB (could be an optical illusion). It reminds me of late 1950-mid 1960's US made 5AS4, which have a shorter bottle than the UK or Aussie made 5AS4's. These are GREAT tubes, BTW.

Both the 5U4GB and 5AS4 are interchangeable.

" Tranny #'s E1a-606-651, E1a-606-702 "

Combined with the paper 'lytics under the hood --- makes me think that the iron are 1966 (51st week) and 1967 (2nd week). Just a WAG. Got numbers on the pots? Just a WAG.

Not sure when paper caps went OOP.


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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 1:01 pm
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BMW2002Ti wrote:
Combined with the paper 'lytics under the hood --- makes me think that the iron are 1966 (51st week) and 1967 (2nd week). Just a WAG. Got numbers on the pots? Just a WAG.


Uh, Steve......the amp's a silverface. With MV control. Casters. Removable grill frame. That ringin' any bells?

Arjay

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 2:20 pm
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Arjay, tolf you it was a WAG. Gotta tell you been under the house fixing a leak in the plumbing (yeah, in 100-degree weather). So, I maybe a little delirious. :lol:

BTW... when were paper caps superceded? All the 1970's amps I've worked on had cans, orange plastic covered Sprague 'lytics, or white or blue sealed Mallories.

Much grass!


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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 3:46 pm
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BMW2002Ti wrote:
BTW... when were paper caps superceded? All the 1970's amps I've worked on had cans, orange plastic covered Sprague 'lytics, or white or blue sealed Mallories.

My 75 DR came with these...

Image

Congrats and welcome to the club! I've said it before and I'll it say again, SF SR, specially early 70s SR, is one of the best amp you can buy today, for what they go for... for $700-900 you get one of the sweetest Fender tone you can ask for!

What speakers are in yours?

Here's a pic of my chassis, it's a 73

Image

Image

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Agree with Arjay, it's gotta be 77, based on the tranny codes.

Mine also has a date stamp in the chassis, try to look for one in yours...

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sat Aug 11, 2012 3:50 pm
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BMW2002Ti wrote:
Arjay, tolf you it was a WAG. Gotta tell you been under the house fixing a leak in the plumbing (yeah, in 100-degree weather). So, I maybe a little delirious. :lol:


Ouch......lo siento, viejo!

I hate plumbing issues.



BMW2002Ti wrote:
BTW... when were paper caps superceded? All the 1970's amps I've worked on had cans, orange plastic covered Sprague 'lytics, or white or blue sealed Mallories.


I think the sealed Mallory's were introduced when production of the ultra-linear's began in '78. Every TR I've ever seen and/or worked on from that era had them, as have the few UL SR's that I've glimpsed at. Same with the electrolytics -- the ultra-linear's all seemed to be equipped with the aluminum-cased Mallory's (600VDC).

Arjay

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sun Aug 12, 2012 7:21 am
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Hey that Fender branded 5U4GB that it came with is longer than the three NOS RCA 5U4GB's I got in my recent tube collection buy.

I put in one of the RCA's and the amp tightened up a bit a little more punch and headroom.

I'm a bit ashamed to admit it , but I have yet to check bias on this amp.
It will happen today (after Church) unless things get crazy at the jail today :(

I saw Andrew Jr Boy Jones and Studebaker John at our local blues fest last night, Jr. Boy Jones did the entire gig with what looked to be a SF Vibro Champ and a Les Paul and sounded Amazing !!!!
It was too small to be a DR and it had too many knobs to be just a champ.

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sun Aug 12, 2012 8:21 am
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blues bondsman wrote:
I'm a bit ashamed to admit it , but I have yet to check bias on this amp.


Remember, Chris -- this circuit employs a bias-balance control rather than the true adjustable idle bias control of the AB763 revision. You'll actually be EQ'ing one power tube against the other to achieve equilibrium between them.

Rawk on!

8)

Arjay

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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sun Aug 12, 2012 9:30 am
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Arjay, the (in)famous "hum-pot." The idea being if the two tubes are conducting in a equal-&-opposite manner, wrt to the sine-wave --- they cancel out hum better. Unfortunately, very few tubes age and change conduction in parallel manner. I don't know of any guitarist that even touches this pot to reduce hum.

Only super anal hi-fi guys tweak their units on a regular basis. I think most of the time it's a placebo effect, at best.

BTW.. there are several variants of the 5U4GB. The CBS USN being the tallest that I have. TungSol JAN being fatter and more squat. RCA and Raytheon JAN between the two (at least the chalky BP ones). Note how the Aussie AWV/Mullard 5AS4 has a very similar internal structure? But a tall, thin glass envelope.

Good luck with you amp! Photos are for ID and perhaps future purchase info. And Tube Porn, of course! :lol:


These are all interchangeable. And excellent recitifers.



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Post subject: Re: Picked this up last night 1974 Super Reverb Silverface
Posted: Sun Aug 12, 2012 9:43 am
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BMW2002Ti wrote:
Arjay, the (in)famous "hum-pot." The idea being if the two tubes are conducting in a equal-&-opposite manner, wrt to the sine-wave --- they cancel out hum better. Unfortunately, very few tubes age and change conduction in parallel manner. I don't know of any guitarist that even touches this pot to reduce hum.


The larger late-model silverfaces have both a "hum balance" and "output tubes matching" pot on the rear panel. The "matching" control sets the idle bias on one half of the output-stage (one or two tubes, as the case may be). The "hum" pot I have found for the most part to be useless. I've never touched the one in my '78 Twin Reverb in the 34 years that I've owned it.

Arjay

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