S-Meter is now working better and RX sensitivity is better after poking and tighting. I think the relay or fuse lamp socket was not making good contact. Tightened a bunch of screws.
S-Meter only goes to half scale in XMIT. I found this problem on and R4b and found what I did on it a few years ago so maybe it is a similar part on the TR-4c. S-Meter zero is normal and it reads about right now on signals . Below is from the list Archives of what I did with he R4b. The archive is really useful. Received new Bias Filter Cap yesterday and installed it today. R4B is now working again. Thanks to help from the list again. The replacement used was a Sprauge Atom 10uf @500V which is a bit overkill but was the closest I could find from either Digi Key or AES on the day I ordered. Bias and S-Meter alignment now work perfectly. It was very interesting to note the difference in the 'magic eye' readings for the leakage tests on the old vs. new cap when testing on the old Heath C-3 meter. The eye would close down about half way on the 150V leakage test on the old filter cap and did not move at all on the new 500v cap. It sort of a tight fit and I had to ream out the holes in the p/s board a bit with my knife in order to fit the larger diameter leads on the new filter. Muting now puts the meter up to 60 over and the 40 over at 15V sets up nicely.
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