I have a Fender BXR sixty sitting on my bench for repair. It has a slight low hissy hum that does not increase when volume is turn up and occasionally pops when turned off (volume at 0). Have already checked the usual suspects: Have replaced the power plug (ground has been cut off) and replaced main power supply filter capacitors. I have an electronics background but little practical experience troubleshooting amps. Can anyone point me in a direction? Has this happened to anyone else? Thank you in advance!
Amp techs have all the diagnostic tools to troubleshoot amp problems. That's my suggestion.
edit to add, I have many years of electronics experience, including circuit design, but take my amps to an amp tech.
Thank you for the response....not an option to take to amp tech. I think I have the tools to fix this issue (oscilloscope, function generator & several fluke multi meters). I just need a little help in troubleshooting. Is this BBS mostly musicians or technicians? If mostly musicians, please forgive the question and I will move on. Thanks,
David
There are plenty of techs on here as well as musicians. But with a BXR 60, I think most techs would tell you the same thing: R.I.P. The cost in time to diagnose it sounds like it's greatly offset by the fact that it's a low priced practice/very small gig amp.
I have a Fender BXR sixty sitting on my bench for repair. It has a slight low hissy hum that does not increase when volume is turn up and occasionally pops when turned off (volume at 0). Have already checked the usual suspects: Have replaced the power plug (ground has been cut off) and replaced main power supply filter capacitors. I have an electronics background but little practical experience troubleshooting amps. Can anyone point me in a direction?
Typically I'd start in the middle, then work in whichever direction is indicated. With that in mind, plug your sig generator into the power amp input and see if the problem goes away.
After a little more poking around, I found that the noise is a very high pitched whine that is coming from the back of the cabinet(rear of the driver). I cannot hear it from the front of the driver. The whine is always there at the same level regardless of volume and never changes volume. Just got a copy of the schematic...will be dusting off the oscilloscope in the morning.
The cost in time to diagnose it sounds like it's greatly offset by the fact that it's a low priced practice/very small gig amp.
