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RE: Making measurements advice

With a 2 stage 2A3 amp, I'll assume the worst case scenario for this particular question and say that we have a CCS loaded 12AX7 feeding the 2A3. When applying signal to an unloaded amp, we are still limited by the bias voltage at the cathode of the 12AX7 and the mu of each amplifying device (as well as where grid current will come into play on the 2A3).

This also comes up when you want to measure output impedance, as you need to measure the voltage present when the OT secondary is unloaded. I have done this on lots of amps, and the increase in voltage on the secondary isn't particularly drastic.

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