GE folks,
A friend passed on this unit to the shop, can’t seem to find any info on the web for it. It has USA100 REV05 printed on the underside. The few models/pics I saw of the USA100 don’t have dual RCAs and have two potentiometers.
I cleaned it up and populated a few parts in the pre section, injected +/-12v and I have a clean sinewave throughout the preamp section.
The pcb uses transistors for switching, small signal -A06 and -TIP35 for the higher current.
Again I populated a few parts and powered up but it doesn’t switch.
Anyone got info on this pcb?
A friend passed on this unit to the shop, can’t seem to find any info on the web for it. It has USA100 REV05 printed on the underside. The few models/pics I saw of the USA100 don’t have dual RCAs and have two potentiometers.
I cleaned it up and populated a few parts in the pre section, injected +/-12v and I have a clean sinewave throughout the preamp section.
The pcb uses transistors for switching, small signal -A06 and -TIP35 for the higher current.
Again I populated a few parts and powered up but it doesn’t switch.
Anyone got info on this pcb?
Attachments
I don't have anything on this amp but for many of these self oscillating amps, the only thing you can practically do is to carefully test all of the components involved with the drive. This means checking capacitors for leakage and capacity. Checking transistors for leakage and open junctions as well as shorted junctions. I've even seen contamination on the board stop self-oscillating power supplies from working.