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Re: here's how you do it for ALL amps.

hey sergey,

you're right, of course--it IS a bit dangerous. that's why i emphasized that you should CAREFULY increase the sig gen voltage while keeping an eye on the vac of the secondary. :)

with a 5v output signal, your primary voltage swing will be well within limits.. think turns ratio--if it's a 5k to 8r winding, thats 25:1 turns ratio, so you're talking 25 * 5v or 125vac. this should be fine for any reliable, working condition transformer.

there are other methods of determining output z--including even using another power amp to actively drive the output of the amp under test. unfortunately this requires a separate amp. for this reason, the one i described is the one i use (and incidentally is not relegated to only output stages, but can be used on any stage in the amp).

ken


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