[drh4683]

thanks all,

The slide pots seem OK for the most part, not too loose. Slide controls were always gimicky in my book and never practical and always subject to intermittents and breaks in the carbon trace. They are simply eye candy in this case with the colors around them that light up. Since I have no control over the treble, I did test the pot and it was working. However, all of the 1uF@50v lytics were shot. ESR off the charts. The caps are cheap, made in Taiwan with the brand name of "Richey". The nichicons are all pretty decent yet but I've got about 10 of these Richey lytics to replace. That should bring my treble back and quite possibly even my lack of stereo balance/output on the left channel. I could clearly tell these richey caps were being used in a left channel and right channel circuits within the receiver as I was seeing two identical circuits with the way the components were configured. Like I said before, the left channel works, but the output is much weaker than the right. I did test the TO-3's on the amp chassis. I did detect much higher leakage in one driver vs the other, not sure which channel was which. Im kind of doing this troubleshooting blindly as I don't have a schematic for this particular receiver and amp. Im hoping to just stumble across a bad transistor and/or cap simply by basic test methods using my sencore super cricket for the transistors (out of circuit), and the dicksmith ESR for the lytics. So far, the gain on all the transistors have been excellent but like I said, I noticed much higher leakage on one of the TO-3 drivers. The one transistor (121-793) measured about 20uA leakage and the transistor of the other channel was almost 100uA. Quite a difference. Lytics and resistors in the amp seemed good when doing mirror image comparisons between the channels. These TO-3's are germanium too, didn't know that junk was still being used in the mid 70's. Not a fan of germanium transistors