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Post subject: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 12:03 pm
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I just receive a amp for repair ; Super twin Reverb, a 395 watts music peak power with 6 X 6L6 Output Power tubes .

Year ; 1976 as pots date code .

I just start to work on the amp and I may need schematic . Can't find no one find on short research on the web . Photos of the beast soon.

Thank's


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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 1:40 pm
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I sent you a copy via email. Forget the "peak power", it looks like 180 watts RMS.

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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 1:58 pm
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shimmilou wrote:
I sent you a copy via email. Forget the "peak power", it looks like 180 watts RMS.



Thank's ,

I just reply to you , it is not this one .

My amp is a 300 watts output Amp with six ( 6 ) power tubes . It like the Ampeg SVT or close .


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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 2:45 pm
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From what I can gather, Fender could have made a limited run of "Professional Series" Twin Reverb's that were 300 watters. Whether there's any truth to that is anyone's guess, and then I might have to plead the 5th. I'll keep investigating when I have more time.


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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 3:48 pm
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Here you go, Stratele......

http://web.archive.org/web/200612311438 ... _schem.pdf

Study the output stage carefully.

Arjay

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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 4:05 pm
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Retroverbial wrote:
Here you go, Stratele......

http://web.archive.org/web/200612311438 ... _schem.pdf

Study the output stage carefully.

Arjay



+1 Thank's Arjay and sorry Shimmilou .

I'm looking to see 6 output tubes , they show only two but it write there are 3 by side .

This 180 watts amp , not a 300 watts , I have all the schematics ,

Thank 's all


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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 4:54 pm
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Retroverbial wrote:
Here you go, Stratele......

http://web.archive.org/web/200612311438 ... _schem.pdf

Study the output stage carefully.

Arjay



After looking carefully , your schematic is not the right one , Shimmilou's schematic is the good one . Like Shimmilou's schematic , my amp use 6C10 and 6CX8 's tubes . Not only regular tubes like 12XX7 .


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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 6:41 pm
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stratele52 wrote:
After looking carefully , your schematic is not the right one , Shimmilou's schematic is the good one . Like Shimmilou's schematic , my amp use 6C10 and 6CX8 's tubes . Not only regular tubes like 12XX7 .


Yes, the reverb-equipped version. I missed that, mon amí.

My bad.

:oops:

Arjay

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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 7:29 pm
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I hope that you have some good ear plugs for when you decide it's time to fire-up that bad-boy! I bet that we could almost hear it in the States when you crank it. :lol:

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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Sun Mar 23, 2014 11:40 pm
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Just to be sure, this is the schemo to that monster?

http://www.webphix.com/schematic%20heav ... _schem.pdf

Good that the 6CX8 (triode-pentode) is readily available in NOS.

http://www.ebay.com/sch/i.html?_odkw=6c ... 8&_sacat=0


I have some NOS 6C10, 6K11, 6Q11, and 6BK11. GE, RCA, and Tungsols. These triple-triodes were used a lot in late 1960's-1970 Ampeg amps.

Good luck with that amp. Stability of the output stage and a healthy PSU is the key. But, I'm sure you already know that. :D

The last SVT I worked on, got all wire-wound Mills resistors in the output and PSU. The ww ability to perform under severe heat and transient demands make them ideal for these amps.


Gonna try and redo PSU caps in that SFDR I got last week. Maybe, tomorrow.


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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Mon Mar 24, 2014 1:14 am
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That's the one BMW2002Ti.

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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Mon Mar 24, 2014 1:59 am
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shimmilou wrote:
That's the one BMW2002Ti.



I agree.


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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Mon Mar 24, 2014 2:09 am
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Amps is almost fix .

Issue ; only a light hum , no sound at the speaker.

Found ; dirty and loose 6L6 sockets 's contacts ; Clean all and tightened all contact ; amp sound "good " now .

2 X 6L6 are weak I put 2 Winged C I had in stock since more 7 years ( ? )
Bias balance is at 22 ma / tube at 508 plate volts.

I will put a bias adjust pot to have proper bias .

Question for you all ; I should order some 6L6 for my stock , wich one should I buy ? I never buy 6L6 since long time , I had many in stock .I don't know wich tubes are good or not these years .

I talk about current production like Sovtek , TAD , JJ ..... Not NOS

Thank's


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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Mon Mar 24, 2014 3:31 am
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For this amp, I would use either EH 6L6, or GT 6L6 GE. :idea:

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Post subject: Re: 300 watts Super Twin Reverb,look for schematic
Posted: Mon Mar 24, 2014 3:37 am
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shimmilou wrote:
For this amp, I would use either EH 6L6, or GT 6L6 GE. :idea:



Thank's Shimmilou


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