On Mon, Feb 28, 2022 at 07:38 PM, Stephen wrote:
My type 106 was working fine until a few days ago when I had no more output at
all on any output. Neither the High Amplitude nor the +/- Fast Rise.
Broken switch SW242A? In High Ampl mode you should measure R99 600R at the GR output plug.
What would happen when R55 is open?
Is the output 0V or some constant negative voltage?
Now the last one (-20) is extremely weird as the square waves follow the frequency I set on the unit, but not the amplitude at all.
I don't think this is weird. The -20 V on top of "A" supplies the grid and trigger circuits. The 4x output tubes anode currents flow in a separate circuit from GND to "A", regulated by anode-cathode voltage, not by grid amplitude.
Albert
