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'noise and squeal'
Author:mategenomics (registered user: 50 posts )
Date: Mon, Mar 20th, 2017 @ 04:27 ( . )

Hi guys,

Out of blue my amp started doing strange things. I have left in a room in my apartment and I havent played it for like a month or have not even been moving it or touching so we can rule out any mechanical stress or environmental issues. The amp is not amplifying any signal, when I turn it on it is doing hiss and slight hum that reacts to volume and gain controls so we can rule out output section too I think.
When gain is maxed past 3 o clock it even starts to squeal with a high pitched sound.

I already experienced this and identified it as broken or microphonic tube but I already swapped both the tubes for new and it is still the same.

I have to admit I have not tried to open it up and measure the components or voltages, maybe you would give me some clue before I start checking everything.

So tu sum it up - I doubt it is the tubes and I doubt it is a lead dress - before this the amp has been dead quiet when playing and I was not moving it anywhere.

many thanks in advance.


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--* noise and squeal
3/20/2017 @ 07:00--steve25

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