I think I'll probably build something like that when I build the Guinevere. I'll probably forego the FET CCS on the driver tube and preamp, maybe add it later. That's how I built the Paramours too - First with a resistor in the plate circuit to B+ and then later with the CCS.

I like how the 2A3 sounds, and I like the glow. One of these times, it might be fun to build a 2A3 push-pull amp too. Lots more oomph, and that's important when playing orchestral music or other material with a lot of range, even with 100dB+ horns. But for starters, I like the SE 2A3. It's simple and it sounds good.

No harm having both an SE power amp and a push-pull amp group build project going at the same time.

Joe

Poinz drew this of my E-Linear circuit. 10k a-a with screen taps at 20% for the 6V6 and a 6BQ7 up front will sound brilliant. Try it with 40% taps for 6L6's. B+ in the mid 200's and run class A bias. 807's are another option too. Or get the OPT wound with 20, 30, and 40% taps and perform your own experiments.

Small negative rail for fixed bias will double as a sink rail for a CCS instead of the resistor and requisite larger neg. rail shown in the schematic.

The grid chokes are just as easy to do as a proper output TX.
regards,
Douglas

I like the idea of using a smaller Bias supply and a CCS on the input. One could even use a grid choke in place of input resistor, if they wanted to go over the top.

And the price: $1.90 for a 6BQ7 @ AES, @2.90 @ Uncle Neds. Matched pair of JJ's $30. @ Uncle Neds.
Center tapped grid choke could be PSA-2N(nickel) from Elecrtra-Print.

Joe

You can find out a little more @ Chris Beck's site. Follow the link attached.

What I know is this, The EP amp uses this as a phase splitter. It is a center tapped choke. Core is nickle. Very nice for low drive levels. Since your amp would not use it this way, the nickle core should be a nice touch.

Joe

• http://www.geocities.com/n9zes@sbcglobal.net/EL84PSA.html