Larryhere40
Active Member
Been working on a right channel power amplifier! Realistic Sta2100d receiver! Changed all 4 TO-3 transistors! Also the 2sd400! Recapped it, still seems to have short! Replaced the burnt resistors, and checked the other ones! Changed some diodes! I have a working left channel and have tried to compare most of it! I find a short until I remove to-3, 509! But it checks out good! The d502 shows continuity both ways, but when removed, it shows good! Had a couple to220 transistors that I changed. They were bad. I need an experienced technician that is willing to show/tell me the correct step by step way to check for a bad part, with an out of circuit way, if it’s possible! When I power it up with less voltage, about 24 volts, It has a hum, which I can’t find, even with a stethoscope! In between everything else, this thing has been bugging me for the last 10 years, yup! Also compared the vr501 and 502, pots! Some reason I can’t seem to post any photos!
