JeffB Posted February 4, 2011 Share Posted February 4, 2011 A friend has a Pro Tube Pro Reverb from 2003. It keeps blowing a T100ma fuse. There is an LED light that is green when the amp is fine and red when there is a problem with v9 and v11.(6L6 power amp tubes) Ive tried replacing the tubes with ones I know work and the fuse Ive replaced a few times but it just blows straight away. What might be the cause and cure? From the owners manual. FUSE V9 & V11 (F1)** - Protects the amplifierfrom damage if the V 9 or V 1 1 tube were to fail. If this fuse fails, replace the tubes in locations V 9 & V11, t h i s fuse, then set the BIAS and B A L A N C E. Owners manual Thanks just trying to sort it out cheaply for a mate Link to comment Share on other sites More sharing options...
kbp810 Posted February 4, 2011 Share Posted February 4, 2011 A friend has a Pro Tube Pro Reverb from 2003. It keeps blowing a T100ma fuse. There is an LED light that is green when the amp is fine and red when there is a problem with v9 and v11.(6L6 power amp tubes) Ive tried replacing the tubes with ones I know work and the fuse Ive replaced a few times but it just blows straight away. What might be the cause and cure? From the owners manual. Owners manual Thanks just trying to sort it out cheaply for a mate Im having a tough time finding a schematic to help form a proper theory... being that the problem occurs right away even with new tubes, that seems to point towards a bad coupling cap. Link to comment Share on other sites More sharing options...
kbp810 Posted February 4, 2011 Share Posted February 4, 2011 ...one quick troubleshooting tip you can try Remove the power tubes and replace the fuse - turn the amp back on and see if the fuse still pops. If so... tubes are likely fine, and could be a bad coupling cap or filter cap (since the main fuse is not popping, it doesn't seem to me like it would be a filter cap) If not... could be something along the lines of a bad screen resistor. Link to comment Share on other sites More sharing options...
tulk1 Posted February 4, 2011 Share Posted February 4, 2011 Here's one from '00. Wonder if they're the same? fender-pro-reverb-pro-tube-guitar-amplifier-schematic.pdf Link to comment Share on other sites More sharing options...
JeffB Posted February 4, 2011 Author Share Posted February 4, 2011 Thanks for the tips, I did as said and still went. Above me to fix so off to the tech. Thanks again Link to comment Share on other sites More sharing options...
kbp810 Posted February 4, 2011 Share Posted February 4, 2011 Thanks for the tips, I did as said and still went. Above me to fix so off to the tech. Thanks again Taking a quick peek at the schematic Tulk posted... that sounds like a great idea! I would be interested in hearing the outcome when it returns though Link to comment Share on other sites More sharing options...
JeffB Posted February 4, 2011 Author Share Posted February 4, 2011 Taking a quick peek at the schematic Tulk posted... that sounds like a great idea! I would be interested in hearing the outcome when it returns though It used to be my amp. I found the schematic for it at home. I took a look and just folded it back up and put it away. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.