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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Transcendent Sound GG help
Transcendent Sound GG help
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Old 23rd March 2012, 05:43 PM   #1
nelsondog is offline nelsondog  Canada
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Default Transcendent Sound GG help

Hi there, I just got a used preamp and it's making a loud, low level hum and one side won't play music. Any ideas what I should look for in order to fix it?
I have replaced the coupling caps with 1uf Russian pio.
Thanks for looking!
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Old 23rd March 2012, 05:55 PM   #2
merlin2069er is offline merlin2069er  Canada
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I'd start backwards and make sure your outputs are isolated from the case, and they're properly grounded.

Then I'd check the output voltages out of your power supply. Make sure that's working.
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Old 23rd March 2012, 06:02 PM   #3
merlin2069er is offline merlin2069er  Canada
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Click the image to open in full size.
It's good to have a schematic in front of you while troubleshooting...

Check the output voltages from the power supply +200 / -200.
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Old 23rd March 2012, 06:05 PM   #4
nelsondog is offline nelsondog  Canada
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Thanks Merlin! I'll have a look...
Also looks like some poor soldering at the diodes. Do I need to heat sink before reparing?
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