6AU6 replacement

[Tony]

Originally Posted by pancaQe

Can anyone suggest a simple, quality 6V6 push pull amp design/schematic. At this point it looks like I'm gonna have to back track anyway. I'm looking at schematics using 6SN7. Any suggestions?

why not a 6LU8 pp amp instead, at a dollar each, U$4 buys you a quad of output power tube, i made 2 amps based on this and i can definitely say that it is worth it...

[Tony]

Originally Posted by SY

But ultimate origin? Not RCA, I think. The input stage is a poor version of the Williamson (there must be almost 0.3mA going though the cathodyne!), the feedback arrangement is relatively ineffective, and RCA engineers were smart enough to understand feedback from the OPT secondary.

RCA's actual pentode driver amp was quite an excellent and innovative design.

in later RCA tube databooks, a 50 watter 7027 design using the same topology was presented, almost since the input used a triode pentode type....

[DF96]

That 50-watter is only a 35-watter in RC-19 (1959). 7199 input and PS, 6AU6 drivers, 7027 output. On a closer look the driver is a bit different from the 10-watter.

[pancaQe]

Tony, I have a couple GE 6LU8A, I thought they were oscillator amplifier. They're also compactron (tiny)

[SY]

Originally Posted by Tony

in later RCA tube databooks, a 50 watter 7027 design using the same topology was presented, almost since the input used a triode pentode type....

Yes, that was the design I referred to in post 14, a very clever circuit. I think it used 6CB6 drivers (RC-21).

[pancaQe]

Another tube I've been reading a little about is the 6AS7GA. Any thoughts on those and which tubes would work well as drivers for them.

[morinix]

Buried on this site is a 6as7 SRPP amp I built long ago. It is a good tube, BIG sound. Needs lost of voltage drive since its mu is so low.

[vinylkid58]

Originally Posted by pancaQe

Can anyone suggest a simple, quality 6V6 push pull amp design/schematic. At this point it looks like I'm gonna have to back track anyway. I'm looking at schematics using 6SN7. Any suggestions?

Here's a schem. I had sitting on my HD. The 6V6's are strapped as triodes, but you could change that.

jeff

[pancaQe]

thanks everyone for your suggestions. Vinylkid, I think that scem is the one i'm gonna use. I wanted one using the 6SN7. Thanks, I'll post how it's coming along.

[pancaQe]

Oh, I'm not familiar with what strapped triodes are. Could you explain?
thanks