[R-390] Re: 26A7 replacement

[Gary Gitzen]

Gord wrote:

>I tried building one out of some power transistors but the
>crossover distortion was too much.

Looking at the 2N498 output stage, that comes as no surprise. 
A bit of redesign with some real forward bias on the bases
should improve things significantly.

>  Maybe my Mark II (plan b?) design will work better ........

Noticing that T603, the original output xfmr, is still on chasis
would prompt me to create a design using FETs as outputs, possibly
driven by a diff-amp or even some flavor of linear IC. That would
eliminate the two xfmrs in the original design.

I'm leaving now to go stand by the 4X4 (10X10, for the metric folks)
so someone can pile on the firewood and light it as they chant
                        He's a witch! Burn him!

Gary