[Adam]

Now that I've used this for a while I've noticed a few problems:

1. After running for about 1/2 hour I get some hissing in the left speakers. Really only audible over whatever I'm listening to if I turn the volume way down. I'm thinking that this is caused by an iffy transistor in the amp (after the vol control, given the amount of hiss isn't affected by raising or lowering the vol)

What I would like to try is simply running it until the problem starts, then turning it off and swapping transistors left to right, and turning it back on - repeating the process until the hiss moves to the other side, thereby identifying what transistor is bad. (The hiss doesn't go away if I only turn it off for a minute or two - it takes about another 1/2 hour of being off).

But how do I tell which end of the transistor or socket is which without having to remove the chassis and trace the wiring? (This unit unlike Zenith TVs of the same era, is really difficult to get the chassis in and out of) I noticed there is a red dot on each transistor and socket which line up. But does the dot indicate the same end on every transistor and socket?

2. The record changer rejects when I turn the control, but not at the end of every record. It will however if I move the arm further to the center so it's right over the center of the record.

3. That 8-track plays tapes ok, but outputs no sound on the right channel. It's Realistic model TR-881, which is not even listed in the sams index. Any idea where I can get a schematic for this thing?