One of the problems with the TSL100 is that the din plug for the F/S is attached directly onto the circuit board. This means it is a week connection from the gibco.

A solution is to wrap your F/S cable through your handle strap (like your input cable) and treat it with respect !!).

I really love this amp however I think Im going to follow LATS's advice and go for a full JJ re-tube. That will have to wait until after xmas !