cyto
Super Member
For a power amp, here's how I did it. Set the scope to read on the lowest voltage setting, mine is 2 mV. Hook a 8 ohm resistor load across the 8 ohm speaker connections (or 4 or 16 ohms, for that respective speaker connection). Hook the scope probe across the resistor load. Turn the amp on and let it idle. (no input signal).
Turn the time window down (or is it up?) on your scope so you can see the 120 Hz ripple. Without the snubber and with "regular" diodes, you should be able to see the ringing very easily. Add the snubber. The ringing goes almost away totally. You can see it change in real time by changing the value of the R in the snubber. If you use soft recovery diodes it isn't as pronounced, but it's still there.
I found the scope shots I mentioned previously. See post #1 on this thread: http://audiokarma.org/forums/index.php?threads/the-1625-amp-mk-ii.778418/
That reminds me that I really need to get a scope, haven't used one since the 70s.