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preamp pedal gone microphonic


artisan
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i run 2 pickups on my double bass via a stereo TRS lead into my 2 channel preamp-mixer then a mono lead into my amp.
last night i noticed that my preamp had become microphonic, i.e. if i tapped it the tapping sound was sent to my amp ?
this has never happen before
i also couldn't get my usual deep/rich bass sound & instead had a crappy honking middy kind of sound.
i wondered if a bad earth on my TRS lead could cause this,any advice.
cheers

btw my pickup & preamp system is the Blast Cult Channel Blaster

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Okay. Just took a look at the weblink. Fair bit of 'marketing speak' on there.
So, to be clear. the transducers are part of the Blastcircuit system ?
And the microphonic noise appears to be caused by tapping the preamp (ie not the pickups themselves).

If that's the case then first suspects would be capacitors esp Electroytics then Ceramics ...

Try tapping them with a pencil and see if that makes a noise though the amp...

Edited by rmorris
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hi thanks for that :)
i know nothing about electronics so will get a local chap to check it out as i wouldn't know a capacitor from anything else in there.
i noticed last night whilst i was messing around that when switched on it also makes a constant hissing noise.

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