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New Project Marantz 2250b
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Old Yesterday, 01:47 PM   #81
pjf610 is offline pjf610
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Ok this is what I got, 18v at the Zener diode, 0v DC offset at the speaker terminals at the R732 0mv R733 2.1mv
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Old Yesterday, 03:28 PM   #82
Mooly is offline Mooly  United Kingdom
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New Project Marantz 2250b
Those readings all sound good.

Connect the scope across the speaker output and set the attenuator for around 1 volt/div (or 0.1/div if using a divider probe) and see if any oscillation is present as you tweak the preset and the bulb suddenly jumps from dim to bright.
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Old Today, 08:13 PM   #83
pjf610 is offline pjf610
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Hi Mooly, as you can see in the pictures not very good, I tried to set the scope to 1v but had to turn it down to 20mv to get the signal, turning up the volume to get what you see
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File Type: jpg Test.jpg (368.7 KB, 3 views)
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