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

> What will be the consequences of just buying any tube(s) and installing 
> it. Am I risking just poor sound or damage to the unit?

You decalibrate the unit, the gain does not have the value it should have 
and the sound is different than it sould be.
The factory presents sound different.
You can overdrive the digi section earlier.
And: If you have 2 units the paches will be not compatible, since they sound 
different.
Dieter