Thanks for this video. I have the same issue with mine. I've had the amp since 95 and gig'd the crap out of it. Started making that noise about a year ago but would stop after 10 seconds. Over the summer it stopped making that noise completely, but it started again in October. I'll have to go through the tubes but it sounds like the caps. Did you change the resistors because they looked bad? I'm wondering if I can get away with just the caps?
Hey! Glad you liked the vid! Yeah, the 4 small resistors looked bad = brown/burnt. They were covered in the original glue, which probably made them "go bad" prematurely. Or, maybe the nearby cap leaked on them. In the video they are hard to see, but when I replaced them, they were very brittle and really needed replacing.
Also, just wanted to let you know, I saw on another video that someone needed to replace those same 4 resistors on their circuit board because they burned out. Those 4 resistors must have a tendency to short/burn out. They are numbers R117, R116, R110, R111 on the Peavey schematic.
@@colemanblues I finally got around to doing this repair and then I couldn't figure out how to remove the board that has those 4 resistors? How did you get them off? It looks like the motherboard is riveted.
@@doogieball2464 Its a chore, but all the circutboards come out by undoing screws. There are a few wires that need to be unplugged from their clips. Then, you can systematically take out all the boards so you can make repairs. This is my first and only youtube video and I should have made the video so it included the removal of all the parts and also showed me replacing them.
Tap test is for when the amp is on and you’re trying to determine if the tubes are microphonic or for probing around tying to find something disconnected within the circuit.
Just got mine out of the shop because of crazy noise like screaming squellies and then all of the sudden whisper quite sound. Turns out the wire and jack between inside speakers need to be changed. WTF over.
i was playing my 1993 peavey 5150 on the channel 3 setting at bedroom level. and all of a sudden there was a big gain drop. there was still volume but the post gain was very off. could it be a power tube or a pre amp tube?
Wrong, they can. Why do you think they call them "Electrolytic Capacitors"? There are even different types of electrolyte for aluminum electrolytic caps: non-solids & solids. Look it up.
Same issue my 5150 has. Will have to try this.
Good job. If you can make more guitar amp repair videos.
Thanks for this video. I have the same issue with mine. I've had the amp since 95 and gig'd the crap out of it. Started making that noise about a year ago but would stop after 10 seconds. Over the summer it stopped making that noise completely, but it started again in October. I'll have to go through the tubes but it sounds like the caps.
Did you change the resistors because they looked bad? I'm wondering if I can get away with just the caps?
Hey! Glad you liked the vid! Yeah, the 4 small resistors looked bad = brown/burnt. They were covered in the original glue, which probably made them "go bad" prematurely. Or, maybe the nearby cap leaked on them. In the video they are hard to see, but when I replaced them, they were very brittle and really needed replacing.
Also, just wanted to let you know, I saw on another video that someone needed to replace those same 4 resistors on their circuit board because they burned out. Those 4 resistors must have a tendency to short/burn out. They are numbers R117, R116, R110, R111 on the Peavey schematic.
@@colemanblues I finally got around to doing this repair and then I couldn't figure out how to remove the board that has those 4 resistors? How did you get them off? It looks like the motherboard is riveted.
@@doogieball2464
Its a chore, but all the circutboards come out by undoing screws. There are a few wires that need to be unplugged from their clips. Then, you can systematically take out all the boards so you can make repairs. This is my first and only youtube video and I should have made the video so it included the removal of all the parts and also showed me replacing them.
@@colemanblues Well I for one seriously appreciate the video! I got a weekend off in a few weeks and I'm replacing those damn resistors!
Tap test is for when the amp is on and you’re trying to determine if the tubes are microphonic or for probing around tying to find something disconnected within the circuit.
Just got mine out of the shop because of crazy noise like screaming squellies and then all of the sudden whisper quite sound. Turns out the wire and jack between inside speakers need to be changed. WTF over.
i was playing my 1993 peavey 5150 on the channel 3 setting at bedroom level. and all of a sudden there was a big gain drop. there was still volume but the post gain was very off. could it be a power tube or a pre amp tube?
Pre amp
Old Grapevine bad capacities capacitor
why are we whispering
Yeah, I noticed after I made the video that my voice was real quiet and low. Sorrry about that.
I like the whispering.
Electrolytes??? 🤣🤣 capacitors dont have electrolytes
Wrong, they can. Why do you think they call them "Electrolytic Capacitors"? There are even different types of electrolyte for aluminum electrolytic caps: non-solids & solids. Look it up.