Members Iron Lotus Posted July 26, 2012 Members Share Posted July 26, 2012 ...Yeah so I have a little issue. The amp has been cutting out.. dropping in volume with some blowing scratchy sounds thrown in there, and sometimes a nice POP when flipping it back off to standby. I figured pre amp tubes.. Tested my tubes... Theyre good. I thumped each pre amp tube while it was fully on...And then wiggled each one ever so slightly...Its DEFINITELY the V3 effects loop cathode follower slot...I swapped out tubes, just to be sure and repeated that test...Different tube, but same spot.. the one right next to the Phase Inverter.Its not the FX jacks themselves, I tried the patch thing.. theyre fine. So it cut out started blowing wind sound, I pushed on that certaintube,(v3) wiggled it a little and it stopped. Wiggled it some more.. itstarted again... The contacts seem to be tight... Ive been insidethe amp and do well with all the mods/soldering/etc etc... Never messedwith anything on the preamp board. My next step would be pull the chassisand check for a cracked solder joint from pushing/pulling out tubesso much trying to find the right tube combination.. maybe cracked a joint. What do you guys think before I have to get up in this things ass tomorrow...? Link to comment Share on other sites More sharing options...
Members FrostByte Posted July 26, 2012 Members Share Posted July 26, 2012 I have this exact same problem right now. It started when I was swapping/trying out a bunch of preamp tube combinations so I'm 100% certain it's a cracked solder joint or 2, just been too lazy to crack it open and fix it I hate the way that board is mounted... Flexes like crazy when removing/installing tubes. Link to comment Share on other sites More sharing options...
Members Iron Lotus Posted July 26, 2012 Author Members Share Posted July 26, 2012 I have this exact same problem right now. It started when I was swapping/trying out a bunch of preamp tube combinations so I'm 100% certain it's a cracked solder joint or 2, just been too lazy to crack it open and fix it I hate the way that board is mounted... Flexes like crazy when removing/installing tubes. Yeah its not supported very well at all for pre amp tube exploring. Mine has been doing it for about 2 months I knew at some point I was gonna have to eventually work on the damn thing so of course I was just lyykkkk ...Im also thinking of a way to add additional support somehow, stop excess flexing. My amp always be flexin on em. Guess I'll fix her up in the next 2-3 days. Link to comment Share on other sites More sharing options...
Members blckbldng Posted July 26, 2012 Members Share Posted July 26, 2012 I used to have a FX loop issue with my 5150I just left a jack plugged in the pedal slot problem fixed Link to comment Share on other sites More sharing options...
Members Iron Lotus Posted July 27, 2012 Author Members Share Posted July 27, 2012 I used to have a FX loop issue with my 5150 I just left a jack plugged in the pedal slot problem fixed You didnt even read my original post. I said it was the effects loop tube slot... not the effects loop. And I also said I tested the effects loop jacks, just to be sure that wasnt the problem. Does anybody read or do you guys just pretty much want paint pictures to illustrate shit every time? LIke if its more than 2 sentences mothafuckas start fallin outta their chairs n shit, I dont get it. But thanks for the reply at any rate. Link to comment Share on other sites More sharing options...
Members FrostByte Posted July 27, 2012 Members Share Posted July 27, 2012 Does anybody read or do you guys just pretty much want paint pictures to illustrate {censored} every time? LIke if its more than 2 sentencesmotha{censored}as start fallin outta their chairs n {censored}, I dont get it. Pretty much ^this Link to comment Share on other sites More sharing options...
Members Iron Lotus Posted July 27, 2012 Author Members Share Posted July 27, 2012 The tube joints were fine, its the .022 cap thats above that fx tube slot that was a little loose, and also you can tellit was exposed to alot more heat due to its position. I think I need to just replace the cap instead of re-solder it. Also adding a 10pf silver mica cap between pins 6 and 7 on the v5 slot (middle tube)..... Takes away alot of FIZZ. Will probably go ahead and upgrade my other 2 screen grid resistors like I did the last time on the powertube board.... A couple went, so I replaced them with 470ohm 5watters, need to get the 2 that werent bad, and upgrade them while IM at it. Link to comment Share on other sites More sharing options...
Members DEADBYDAWN Posted July 27, 2012 Members Share Posted July 27, 2012 The way the pre tubes flex the board on those amps is BS. They used to use a piece of metal to stop the flex which was great till it hits the board like the one in the pics I saw. Link to comment Share on other sites More sharing options...
Members Iron Lotus Posted July 28, 2012 Author Members Share Posted July 28, 2012 The tube joints were fine, its the .022 cap thats above that fx tube slot that was a little loose, and also you can tell it was exposed to alot more heat due to its position. I think I need to just replace the cap instead of re-solder it. Also adding a 10pf silver mica cap between pins 6 and 7 on the v5 slot (middle tube)..... Takes away alot of FIZZ. Will probably go ahead and upgrade my other 2 screen grid resistors like I did the last time on the power tube board.... A couple went, so I replaced them with 470ohm 5watters, need to get the 2 that werent bad, and upgrade them while IM at it. Hmmm, apparently on the screen grid resistor thing... I had already upgraded them all... Theyre already 470 ohm 5w 5%. Its been a while since I did that:freak: My power tube board screws instead of rivets... its a 2002 5150. Link to comment Share on other sites More sharing options...
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