Mailist to discuss all issues regarding the Digitech GSP-2101 Guitar FX Processor group photo

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Mailist to discuss all issues regarding the Digitech GSP-2101 Guitar FX Processor

Index last updated: 2026-04-28 23:25 UTC

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2011-06-19 by M M

So recently my 2101 gets all squeelie when I run a lot of gain through the tubes. I think they're going microphonic. I'd like to try a new set of tubes but am not sure where to get replacements and what kind to get. I'd like to return it to a stock sound.

I believe my unit is running the stock GT tubes (groove tubes).

Anyone have a source and what is involved in changing them? Do I have to bias anything or what?

"Never put off till tomorrow what you can ignore entirely."

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