multiple Class A single ended power tubes?

[mike_mccue]

I'm reading some guitar amp specs and getting a bit confused:

"The RMB runs between 5 and 10 watts with various output tube configurations. It is a class (A) design output stage single ended configured for 8 and 9 pin sockets allowing a plethora of output configurations. It comes standard with (2) EL84 JJs. However, you can order it with 6V6's or a combination of one EL84 and one 6V6. You can remove one of the tubes at any time to decrease the power to about 5 watts or order it with (2) 6V6's at 10 watts."

Is there a design where the power section uses multiple tubes and is single ended? I was assuming this is a class A push pull design... but now I'm wondering if it's a design I don't understand.

It has a single 8 ohm speaker output so that's why I assumed it was single push pull circuit with 2 tubes.

Is it possible it's some other type of design?

FWIW it's the "a combination of one EL84 and one 6V6." feature that even got me to think about the amp in any detail.

I'm just trying to understand it better.

thanks,
mike

[tubeswell]

They were probably thinking of 2 x output tubes in parallel into an SE OT. I had a thread about this in June. Check out the Anglea schematic

http://music-electronics-forum.com/s...ead.php?t=8060

[mooreamps]

Is there a design where the power section uses multiple tubes and is single ended? I was assuming this is a class A push pull design... but now I'm wondering if it's a design I don't understand.

over on 18watt there is a print of someone who tried to reverse engineered my 10 watt PA section. It's close enough it may work for someone who wants to try to build it. FYI : no PA tube built-in-test lamps and no PA voicing...

-g

[mike_mccue]

Thanks everyone.

I've never seen circuits like that... it was a great opportunity to learn something.

best regards,
mike

[Steve Conner]

Parallel SE works fine, but it was very rare in commercial amps. The reason is that, once the designer added a second tube, he could get more watts, with a smaller OT, by using his two power tubes as a push-pull pair. And wattage was a selling point until the recent craze for low-powered amps.

The rules are different now, anything goes as long as it has tone. I've seen quite a few parallel SE hi-fi amps.

[hasserl]

See the Gibson GA-8 Gibsonette: http://schematicheaven.com/gibsonamps/gibsonette.pdf

[stokes]

The 6v6/EL84 combination sounds great.I never heard the one you described,but I built one for my sons girlfriend a couple years ago,and it is a very unique sounding "Champ".I also have a bigger (25watts) SE output with 2x6L6's with a "Trainwreck" pre-amp.Want to tear that one apart and try adding a pair of EL84's with a single 6L6.The addition of the '84 along with a 6V6 or 6L6 gives it a nice chime.

[mike_mccue]

thanks everyone.