I thought I had retired from making gear for a while, but my wife is a lot better and our singer has broken his ankle!
So I have a few weeks to make something from stuff in my workshop, like this lot:-
A 60 year old box from a vacuum gauge.
A western 862 vu meter
I have replaced the burned out bulbs with two warm white LEDs in series with a 560 res to run on 6V, works a treat.
I have adapted the circuit's gain from 88-90dB to a switched 37-70dB in 3dB steps.
The lower gain does not need a pentode output stage so I subbed a 6J5 triode stage.
I redesigned the ladder pad through trial and error and whatever common sense I might have left.
Should be fun
DaveP
So I have a few weeks to make something from stuff in my workshop, like this lot:-
A 60 year old box from a vacuum gauge.
A western 862 vu meter
I have replaced the burned out bulbs with two warm white LEDs in series with a 560 res to run on 6V, works a treat.
I have adapted the circuit's gain from 88-90dB to a switched 37-70dB in 3dB steps.
The lower gain does not need a pentode output stage so I subbed a 6J5 triode stage.
I redesigned the ladder pad through trial and error and whatever common sense I might have left.
Should be fun
DaveP