Members Deeprig9 Posted May 10, 2009 Members Share Posted May 10, 2009 I have an old Crate TD50-c combo from the early 90's, haven't played it in years. Diagnose: 1 12ax7 preamp tube (repaced, not the problem)solid state 2/10 speakers. Amp will cut out, sometimes never even make noise, sometimes juicing the volume up and down over and over will make it 'pop' back on, or turning the amp on/off/on/off etc. The spring reverb box still rattles through the speakers when kicked around, although no signal input is audible during cutout time. Begin now. Link to comment Share on other sites More sharing options...
Members phyrexia Posted May 10, 2009 Members Share Posted May 10, 2009 do you have effects loop? could be cold solder joint on effects send or return jacks. could be input related(does wiggling cable do anything?) reverb works, so power amp works, so it's between the input jack and the reverb. Link to comment Share on other sites More sharing options...
Members teemuk Posted May 10, 2009 Members Share Posted May 10, 2009 - Dirty potentiometers - Dirty switches and switching jacks (e.g. the effects loop) - Broken solder joint(s) Link to comment Share on other sites More sharing options...
Members Megadeth Man Posted May 10, 2009 Members Share Posted May 10, 2009 The Greys. Link to comment Share on other sites More sharing options...
Members Deeprig9 Posted May 10, 2009 Author Members Share Posted May 10, 2009 do you have effects loop?could be cold solder joint on effects send or return jacks. could be input related(does wiggling cable do anything?)reverb works, so power amp works, so it's between the input jack and the reverb. There is an effects loop but it's never been utilized, effects were always front loaded. Wiggling the cable or doing the old in/out/in/out never had any affect. Kicking the amp around would occasionally work, along with the previously mentioned methods in the OP. Link to comment Share on other sites More sharing options...
Members Pankot Posted May 10, 2009 Members Share Posted May 10, 2009 If there is an effects loop, you can try the following: 1) When the amp is in the "cut out" state, take a lead from the effect loop send to a known good amp. Do you get any sound? 2) When the amp is in the "cut out" state, put a signal into the effect loop return. Does anything come out of the speaker? This will help narrow down the fault area. If kicking the amp sometimes fixes it, the smart money is on something semi-mechanical like a cracked solder joint. Link to comment Share on other sites More sharing options...
Members Marshredder Posted May 10, 2009 Members Share Posted May 10, 2009 - Dirty Effects Loop.- Bad Tube- Cold Soldier Joint. Its one of those, almost guarantee it. Link to comment Share on other sites More sharing options...
Members phyrexia Posted May 10, 2009 Members Share Posted May 10, 2009 A Soldier Joint. I remember smoking them back in Nam. Link to comment Share on other sites More sharing options...
Members JerryP Posted May 10, 2009 Members Share Posted May 10, 2009 dirty effects loop jacksdirty effects loop jacksbroken solder joint on input jackJerry Link to comment Share on other sites More sharing options...
Members almightycrunch Posted May 10, 2009 Members Share Posted May 10, 2009 If kicking the amp sometimes fixes it, the smart money is on something semi-mechanical like a cracked solder joint. would be my first thought as well. Link to comment Share on other sites More sharing options...
Members Deeprig9 Posted May 11, 2009 Author Members Share Posted May 11, 2009 Will check it out.... THANKS BROS Link to comment Share on other sites More sharing options...
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