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Some basic problems here:

1) You must have a load on any output transformer coupled amplifier. Tube or solid state. An open secondary transformer has very high to virtually infinite primary impedance. That means you have a very large inductor on the OPT tube and the plate can rise to several KV with applied signal. Destruction of the OPT is a definite possibility.

2) if you are to perform meaningful voltage tests, you want the amp to be in a typical operating condition. The very least is an ideally non-inductive resistor at the impedance of the OPT. More ideally there are some good speaker simulators you can build that get you closer to the non-ideal speaker load.



Edits: 09/18/17 09/18/17 09/18/17

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  • Some basic problems here: - gusser 14:08:49 09/18/17 (0)


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