Members bohemoth Posted May 16, 2007 Members Share Posted May 16, 2007 So the "high" channel on my mig100 isn't working. The "lo" channel works fine, but on the high channel there is hardly any sound. Narrowing it down, it looks like it is probably one of the capacitors around the socket for the preamp tube that makes another gain stage. I am going to try replacing them, but if anyone has any other suggestions or has had this problem before, i'd love any input. Also, if anyone has a schematic for the 100 they could send me it would be great. I've just been going by the schematics for the 50 and the 100h. Link to comment Share on other sites More sharing options...
Members bohemoth Posted May 16, 2007 Author Members Share Posted May 16, 2007 bedtime bump Link to comment Share on other sites More sharing options...
Members TU BE Posted May 16, 2007 Members Share Posted May 16, 2007 PM a forumite clay_finley. I had a JCM800 a few years ago that was doing that and he fixed it for me. Just tell him Jason sent ya. He's a really cool guy and know a lot about fixing amps. Link to comment Share on other sites More sharing options...
Members Puddlegum Posted May 16, 2007 Members Share Posted May 16, 2007 Maybe the input connector has gone bad. If you can open it up, take a look at the solder connections and go from there. Link to comment Share on other sites More sharing options...
Members JerryP Posted May 16, 2007 Members Share Posted May 16, 2007 Dirty low input jack or bad first preamp tube.Jerry Link to comment Share on other sites More sharing options...
Members BigBone Posted May 16, 2007 Members Share Posted May 16, 2007 See my response in your other thread. Link to comment Share on other sites More sharing options...
Members streamliner Posted May 16, 2007 Members Share Posted May 16, 2007 Yup, sounds like the V1A triode is bad...less likely that the jack is dirty, but spray some D5 in there for the hell of it! [Edit] - Just pulled up the schematic...JerryP is right, if that LOW input jack isn't closing properly when unplugged, that is definitely the problem. Deoxit! Link to comment Share on other sites More sharing options...
Members bohemoth Posted May 16, 2007 Author Members Share Posted May 16, 2007 thanks guys, i'll try this right now actually. steamliner...do you have a schematic for the mig100 you could send me? Link to comment Share on other sites More sharing options...
Members bohemoth Posted May 16, 2007 Author Members Share Posted May 16, 2007 so it looks like something was at one point soldered to the connection, so even when the jack is closed, the circuit is not. if anyone has a schematic that would be really really helpful. Link to comment Share on other sites More sharing options...
Members streamliner Posted May 17, 2007 Members Share Posted May 17, 2007 Here it is: http://www.blueguitar.org/new/schem/sovtek/mig-100h.gif I'd like to hear what the problem turns out to be! Link to comment Share on other sites More sharing options...
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