[John L Stewart]

In this one the 6N7s need to be driven into grid current to get anykind of useable output current. But the stabilization factor is porportional to the pass tube mu (35) & amplifier gain. The gain is reduced a little by the 12B4 CF.

Looking back in from the output terminals the source impedance is proportional to the amplifier gain & gm of the 6N7s, so 3x whatever the 6N7s are doing at that load.

Notice it can be swiched for either C or L filter input. So at lower voltages, higher currents are possible.

Stability depends mostly on the gas tube & output sampling resistors. Altogether a passable PS for ordinary work.

Why did I use 6N7s? We had a pile of them & $$$ were short. Overtime I also used some 6A3s & 6B4Gs. Sure would not do that now!

Cheers to all, John