I bought an Eico 2080 Integrated Amplifier on eBay. It is very similar to
the Eico ST-70.

I'm not a big fan of tone controls. I also wanted to try a really cool
remote volume control kit designed & sold by Mikkel Simonsen (unfortunately,
he doesn't hang around R.A.T. these days).

Mikkel's kit includes a time-delayed mute and power-on (e.g. B+) function on
a small PCB that runs off of the filament supply. Best thing about it is
that I can turn my amp on and off across the room from my lazy ass using the
remote (e.g. when the phone rings).

I removed the PECs and other tone control stuff from the Eico. I fashioned a
rack-mountable faceplate, painted with lettering.

I didn't use the ALPs control from Mikkel's kit (it was a bit big for this
app) but instead removed a 50K pot from a broken SS amplifier.

My design goals:

1) Present a reasonable impedance (200K) to the phono output and other
inputs;

2) Isolate the balance from the volume as best as possible;

3) Provide a buffered output for Tape or Line out

4) Mute the circuit on command by forcing the input to the main amplifier
stage to ground; do it in such a way as to avoid a click when changing
states.

The original tone circuit used the 2nd stage (12AU7 like) of a 7247 / 12DW7
in a CF configuration. I wanted to sub a 6CG7 for improved linearity. The
original 7247 CF was set to idle at 4 ma. I kept the same component values
for the 6CG7, although its specs are a little different.

Before I implement it, I had a few questions:

A) Is a 200K balance pot too low a value?

B) Any problems with the position of the mute switch in the circuit?

C) Any problem with the tap-off point for the Tape Out?

D) Any other apparent problems?

Thanks to anyone who cares to respond with advice.

Jon