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SPX pro audio amp   No audio output
SPX pro audio amp   No audio output
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Old 16th March 2019, 01:01 AM   #1
neonarossa is offline neonarossa  United States
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Default SPX pro audio amp No audio output

I have +-15v on ICs 1-5
100hz Signal in & out ICs 1-4
No signal in or out IC 5
Rail voltage +29.44v /-29.46
Checked all drivers?
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Old 16th March 2019, 01:20 AM   #2
Perry Babin is offline Perry Babin  United States
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Have you operated all switches and pots through their entire range while listening for output to see if audio ever played through?
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Old 16th March 2019, 01:33 AM   #3
neonarossa is offline neonarossa  United States
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Yes. Although the low/full/high switch is stuck in the middle.
I checked for signal on the pins under the board. Signal was present.
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Old 19th March 2019, 12:09 AM   #4
neonarossa is offline neonarossa  United States
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Amp is fixed!! I removed the xover switch. Took apart and cleaned the corroded contacts and installed. Thanks again..
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