Hi...
Looking for some help with an amp problem. Retired now and looking to get back into some playing. Picked up a Fender Champion 30 with a problem hoping for an easy fix for a small practice amp.
Amp has a very loud hum, unusable, when turned on. Here is what I have observed or tried so far.
1. Hum is present with all controls at 0, doesn't change with movement of any controls, did seem to be a pop, crackle (dirty pot type noise) with reverb control, after some movement now doesn't seem to cause any change/noise
2. Plug in guitar hum still present at same volume, can hear guitar in/behind hum.
3. Pulled chassis and number 1 input jack legs were loose (the 2 legs closest to front of amp) to the point the jack actually lifted slightly off of board when turned over.
4. Resoldered jack, no change in hum level
5. Looked for other cold solder joint, reflowed a couple, no change
6. Disconnected reverb tank, no change
7. Tried this speaker with a different amp, sounded fine
8. Checked DC voltage at the speaker leads... consistently 3.6v dc when turned on, bleeds off to 0 when turned off.
9. There are a few brown sticky dots on the transformer and a series of dark spots on the bottom of the aluminum pan in a pattern out about 8"but it doesn't look like "tar". Not knowing the former life of the amp, could be as simple as a spilled/splashed soft drink?, they wipe off with a wet cloth.
Suggestion for next steps?, I don't have any other test equipment, but my trusty mulitmeter. Thanks for your help.
Looking for some help with an amp problem. Retired now and looking to get back into some playing. Picked up a Fender Champion 30 with a problem hoping for an easy fix for a small practice amp.
Amp has a very loud hum, unusable, when turned on. Here is what I have observed or tried so far.
1. Hum is present with all controls at 0, doesn't change with movement of any controls, did seem to be a pop, crackle (dirty pot type noise) with reverb control, after some movement now doesn't seem to cause any change/noise
2. Plug in guitar hum still present at same volume, can hear guitar in/behind hum.
3. Pulled chassis and number 1 input jack legs were loose (the 2 legs closest to front of amp) to the point the jack actually lifted slightly off of board when turned over.
4. Resoldered jack, no change in hum level
5. Looked for other cold solder joint, reflowed a couple, no change
6. Disconnected reverb tank, no change
7. Tried this speaker with a different amp, sounded fine
8. Checked DC voltage at the speaker leads... consistently 3.6v dc when turned on, bleeds off to 0 when turned off.
9. There are a few brown sticky dots on the transformer and a series of dark spots on the bottom of the aluminum pan in a pattern out about 8"but it doesn't look like "tar". Not knowing the former life of the amp, could be as simple as a spilled/splashed soft drink?, they wipe off with a wet cloth.
Suggestion for next steps?, I don't have any other test equipment, but my trusty mulitmeter. Thanks for your help.