super reverb 4/10 combo silverface

[ampmike]

Hey ,just wanted to get an idea of this amp my kid got me from a
local sale.he bid on it and won.Im not up to pulling it out yet,and
wandered if the chassis serial number would ball park it.It A600398.
I found a dating source but it had five numbers and one letter.One
day I will pull it and look at the transformers but not today.Can anyone
give me a year with just the chassis for now,Im guessing in the 70"s
Its got the paperwork and not one pot is even scratchy,sounds good.
Everything works real good,might be a good amp to put better speakers
Thank you

[Stevem]

If I recall right if it does not have a master volume pot then it's a 69 thru 76 model.
What are the date codes on the speakers?

[pompeiisneaks]

Seems fender even says the only way to get a ballpark figure on older amps is to look at the transformer stamps.

https://support.fender.com/hc/en-us/art ... lifier-is-

~Phil

[ampmike]

OK,all fender factory speaker 0614121
465-62910LS-1 It does have the pull master volume,It is dead mint tolex everthing cosmetic is perfect.
Ill pull the amp out one day this week,thats what I got so far,Thank You

[pompeiisneaks]

From here:

https://www.tedweber.com/speaker-codes-application/

that 465 means it's oxford and the timeframe listed below for a super silverface is '68-'82, and oxfords are possible. From what I'm seeing the digits after the 465 should be the year, so 62? seems off unless it sat on a shelf for 6 years. it could be just the 6 meaning 66 or 76? probably still going to need transformer codes to confirm for sure.

~Phil

[ampmike]

Hey Phil Im sorry 064121 then 465-629 10L6-1 Mayby that will help ,thanks buddy

[Reeltarded]

A and 6 digits. 1976 and speaker code is Ox 29th week 1976.

[ampmike]

Thank you M and Phil. Just was playing it today and got curious

[Stevem]

It really does not matter much other then personal curiosity because all the silverface master volume amps are the same, and being a master volume amp it's 68 watts of clean output power, not 45 like with the blackface amps, so these amps do not give up the goods as easy without bring too loud!

These amps use what's call ultra linear type output transformers which help the output stage to stay clean.

If you going to play the amp out it may be attenuator time?

The other pain in the ass thing about these amps is that they only have a output tube bias balance control, not a bias adjustment control, but it can be reworked to have such.

[ampmike]

Thanks guys,and Steve you are describing this amp to the T.Nothin speacial here.Going to mess with it some day.Ultra linear dont like hearing that at all.Well thanks boys,Have a great weekend

[67plexi]

I have one UL 70 watt mint used the Jensen speakers in my 1960 5G12 Fender Concert amp serial #00074 Triad transformers

[TUBEDUDE]

The speaker swap is a good idea, i haven't heard a good oxford ever.
Don't give up on this, i have fixed many of these. You can disable the master, or convert it to a LaMar master.
I would convert the balance to a bias control, disconnect the feedback loop, remove the screen/UL taps and hook each screen to its plate through a 5 watt 1k5 resistor. Blackfacing is just a few components to replace. With the right speakers, it could be as good as any Super out there.

[Tony Bones]

... remove the screen/UL taps and hook each screen to its plate through a 5 watt 1k5 resistor.

That would be triode mode, and I don't think that's what you meant.

You probably want to connect the screens to the second node in the PS chain (with a 1k5 5W resistor for each at the tube sockets.) I don't know about Super Reverbs with the UL OT, but Twin Reverbs of the same era didn't have a choke in the usual spot. Instead they had a 2k7, 10W resistor there. You could just connect the screens there - it's the same node that feeds the PI. You might want to replace the 2k7 resistor with a 1k, 10W. You could replace the resistor with a choke or get fancier still and add another capacitor and node to the chain. Sharing the node with the PI probably won't cause any trouble, but those amps are prone to oscillation, so you never know...

[TUBEDUDE]

You are correct. Memory fails.

[Lynxtrap]

It really does not matter much other then personal curiosity because all the silverface master volume amps are the same, and being a master volume amp it's 68 watts of clean output power, not 45 like with the blackface amps, so these amps do not give up the goods as easy without bring too loud!

It's not necessarily ultra linear just because it has a master volume. The master volume came a couple of years before they went to UL.
It's usually easy to tell as it will say 45W or 70W on the back of the amp.