Yes the sound is at normal volume. I have used this setup in the past with no problems seeing the output pattern on the scope (obviously at a much higher voltage than the input signal). I even tried a different probe.If you can hear sound from the speaker then there must be a voltage signal across it so I don't know why the 'scope can't see it.
Is the sound normal volume?
Yes sound is unchanged and yes it is a measurement issue. I am a newbie.So this must be a measurement problem, not an amplifier problem.
When you have the amplifier producing sound through the speaker and you then connect the probe does the sound from the speaker continue unchanged?
Careful there, we don't know if the output is single ended or bridged. Keep the scope probe ground on the amplifier chassis.If you connect the probe to the 'scope calibrator do you see that signal?
Did you connect the probe tip to one speaker lead and the probe ground clip to the other speaker lead?
It is a transistor amp. Even if I put the leads from the o-scope accross the output ground and 8 ohm output port (or any of the other options) I still see very little output at all. But I can hear it quite well. Heres an update on what I tried today. I connected the leads of the scope to its internal calibration point (5v) and adjusted the scale of the scope so 5v = 1 division on the scope. The input shows < 1 volt coming from the signal generator with a perfect sine wave. If I put the leads to the output it shows little or no output. I'm new so thanks again for your patience.Is it a valve (Tube.) amplifier with an output transformer and is the transformer secondary floating. (Neither side connected to ground.) ?
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by Luke James