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Discussion in 'Shock Brother's DIY Amps' started by Bristlehound, Jan 28, 2018.
I didn't check it.
You can tell what the input impedance is on your volt meter by what voltage you get at the grid on a cathodyne PI. If you get something around 3V to 5V, then you have a 1M input impedance. If you get something around 17V to 22V, then you have a 10M input impedance.
There is no need to resolder anything. Just get a new volt meter with a 10M input impedance.
Whoever put 18-20V for the grid of a cathodyne didn't know what they were doing.