Announcement
Collapse
No announcement yet.
Search Result
Collapse
13 results in 0.0044 seconds.
Keywords
Members
Tags
-
Soundcraft MFXi Mixer-Hum in the outputs
I have on the bench a Soundcraft MFXi mixer with 60hz hum in the main and aux outputs. There is nothing connected to the mixer except some headphones. I’ve...
-
Output Transformer Question: Marshall JCM900 50W
I have a Marshall JCM900 50W (model 4500) with low output. It's only putting out a few watts (measured by turning it up to 11 and not experiencing any hearing...
-
Thanks for the input. I took Guitician's advice and turned the bias pot down and watched the rails gain 2 or 3 volts. It resulted in about an 80% decrease...
-
Mark, that is the correct speaker but it is a linear power supply.
MOSFETS are IRFP140N and IRFP9140N
Transistors are STD03N and STD03P...
Leave a comment:
-
Samson D412 Powered Speaker Overheating
I have a Samson D412 Powered speaker on the bench which is overheating at idle... almost enough for shutdown but the slightest bit of music puts it over the...
-
I tried an experiment and moved the transformer power supply connection to the "C" power supply instead of "B". A little less voltage...
Leave a comment:
-
-
I did try a different cap to no avail. I even tried stepping it up from 20uF to 30uF. It reduced the ripple (and the hum) slightly but not significantly....
Leave a comment:
-
Twin Reverb Silverface: Hum in Reverb Loop
I have a Fender Twin Reverb on the bench with a hum in the reverb circuit--only audible when reverb knob is turned up. I'm not sure exactly which model the...
-
Yeah, you're right. It looks like some of those surface mount caps are just sitting on top of the pads.
Anyway, I did a reflow on everything...
Leave a comment:
-
Yes, several. And surface mount soldering is not a problem. I am, indeed, a full time music electronics service technician....
Leave a comment:
-
It was mostly consumer/user type forums so no one really knew which two capacitors it was. Many folks talked like it was a common problem. I was hoping some...
Leave a comment:
-
Korg M50 Freezing -- Which Capacitors Need Replacing?
I have a Korg M50 on the bench which freezes occasionally (no key, button or touchscreen response). In (many) other forums I've read that it needs a software...
Leave a comment: