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[Amps] Alpha 87A - strange power related issue

To: "" <>
Subject: [Amps] Alpha 87A - strange power related issue
From: Eric Dobrowansky <>
Date: Sun, 9 Oct 2022 20:26:27 -0400 (EDT)
List-post: <>
It's been a long time, and I'm not sure if there is a dedicated Alpha 87A 
related mail list in existence any longer, so I will go ahead and ask here.

I have an 87A that started exhibiting a strange problem.

When the amp is plugged in, the blower automatically starts, and various band 
and segment LEDs illuminate, but the amp does not start up. The LEDs which 
illuminate vary each time the amp is plugged in. 

If I try to push the POWER OFF switch, the amp will turn off the blower and 
LEDs, but as soon as I release the switch, it returns to the state where the 
LEDs and blower are on.

If I push the POWER ON switch, the amp starts up normally. The amp works fine 
once it completes the warm-up period. 

If I then press the POWER OFF button to turn the amp off from when it is fully 
running, it shuts down properly. IE - all the LEDs turn off, and the blower 

However, if I leave it plugged in, out of nowhere sometime later the above 
symptom repeats, and I have to pull the AC plug to get it to shut down 

Any recommendations as to where to start troubleshooting?  Maybe a cap going 
bad somewhere is pulling down a particular control circuit?


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