ampage Tube Amps / Music Electronics	For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

Four 6V6's on a Bassman O.T. ?

:

12/13/1999 11:53 PM
Daver	Four 6V6's on a Bassman O.T. ? I have an unused tweed bassman style output transformer lying around I want to use. It's approx. 4K primary to 2ohm secondary. Am I wrong to think I could use it to run 4 6V6's in PP, fixed bias through it? Wasn't the Deluxe Reverb O.T. primary around 8K? A 4X10,6V6 tweed style amp sounds intriguing. Thanks for the help! Daver

12/14/1999 12:06 AM
Jim S.	I don't think a DR output transformer's primary impedance is quite that high. I think it's more like 6600. My guess is that things are close enough that it would work OK.

12/14/1999 1:15 AM
John Stokes	Daver, I've been thinking about that for a long time!! go for it!! Should work fine. Just keep the voltages within reason for the 6V6s.

12/15/1999 2:27 AM

Thanks guys. Yeah, it seems like it should work out O.K. I just wasn't 100% sure if the primary impedance would be so high as to affect the tone or power output alot. Hopefully I can start ordering other parts and an enclosure sometime after the holidays and before I see my credit card statement from Christmas :^) Any other input or personal experiences with this type of set up are appreciated!
Daver

12/15/1999 5:00 AM
SteveF	Daver, by all means, go for it and don't look back. I built a 4 x 6V6 amp using a Bandmaster tranny (same ratio, but not as robust as a Bassman). It's a nice combination, I'd bet you will love it. No problems thus far, and I play it loud, and fairly often. SF

12/16/1999 12:22 PM
Pete	Daver I'll second this motion I've built an amp like this also. I used the Twin Tweed circuit. Over time, I replaced most of the components in the amp with NOS. The resistor are all AB carbon-comp, the coupling caps are all Vitamin Q's the speakers are 1960 Jensen Vibranto's I have owned ALOT of differnt amps in my life, and this one is a keeper. Pete

12/15/1999 5:18 AM

How about Class A (or pseudo Class A)?

To Jim, John & Steve:

So what about using a 2-6L6 Class AB OT for 4 6V6's running in Class A or pseudo Class A (i.e. cathode-biased fairly hot)? Or a quartet of EL84's wired up like an AC-30... (or would the impedances on that be off)?

I've also had this idea of rebuilding my Peavey Classic 30 as a AC-30, but maybe with just 2 EL84's if the OT or PT couldn't handle all 4. (The OT is for a quartet of EL84's running in Class AB with a B+ of around 332vdc, with 8 ohm and 16 ohm taps.) I guess if I was to go to all of that trouble I could replace the footmount OT, too...

Steve Ahola

Page 1 of 3