help with gsp2101 tube patches problem
2004-10-28 by pinballwizard@tiscali.it
Hello all on the list i have a friend of mine that bring the unit in the subject for a strange problem: everytime in the patch selected there is a comp/dist that refers to the 2 tubes (clean tube, distorted tube, etc.) the overallsignla is veeeery weak. i have substitued with 2 new EH 12ax7 but stangely cant get signal at all (strange that the old works bad and the new nothign at all O_o). - the tubes are marked with 12ax7a2 (red ink - no brand) ..i have checked and there arent' info about seem to me to be the most obvious 12ax7 (but also may not to be who knows..) - i have checked all the settings digitally on the patch and at the maximum the problem is the one above .. so it may be not a problem of software / configuration and also adjusted the trimmer signal levelof the 2 tubes (it acts but cant reach usable operating levels) but the leve at maximum remains at the 5 % of the operating signal (other than is really bad sounding obvuously) Can someone here gimme an hint / help ? it would be really appreciated. ps. Digitech sent me soon a well done schematic that anyway can't help too much. thanks a lot, Paolo.