6ba6 are notiorius for grid/cathode leakage and if your using a a high
impedence circuit that is compounded too , try 6ba6w they much
better....P


"Dave" wrote in message
...
The circuit as designed is subject to significant drift.

Has anyone found a mod or knows of a link to a mod? I prefer NOT to
get into matched 6BA6s.

I am a retired EE and before I jump into the circuit I was wondering
if someone jumped in ahead of me.