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Memphis 16-MC1000D Ground Short (Newbie 1st Post)
Memphis 16-MC1000D Ground Short (Newbie 1st Post)
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Old Yesterday, 03:52 AM   #31
Perry Babin is offline Perry Babin  United States
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
Going from the cap loaded test to the FETs should not have changed the frequency. Regularly check the frequency through the rest of the repair to see if it changes again.

What's the difference on your scope with the '5v' in a box or without the box?

the waveforms look OK. There's no one 'perfect' waveform. If the waveforms are good with the caps, there is virtually no way that there will be a drive circuit problem.
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
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Old Yesterday, 02:08 PM   #32
williokeef is offline williokeef  United States
diyAudio Member
Join Date: Jul 2021
The box surrounding the 5v is a selection marker/cursor. I don't believe this had any affect on the freq change but I will verify once I get back home.
Also I'll verify that I still have +-60v on the op side before installing the replacement transistors and continue to monitor the freq on the ps-fets. Thanks again
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Budget Solder Iron and Solder Sucker / Aukuyee Q15001 Digital Oscilloscope / UEI DM383B DMM
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