Hi!
Have you got a copy of the Service Manual and can it be found anywhere?
I'd be more than willing to look over the circuits and give you a second opinion as to which resistors need to be carbon comp and which you can reasonably use carbon film in!
There's all sorts of fleabay sellers advertising kits of "carbon composition" resistors but one glance at the pictures reveals they're only describing "what people are looking for" – carbon composition are always parallel–sided! I have never seen a full kit of true C.C. resistors offered in E24 from 1 ohn to 10M anywhere in goodness knows how many years – only individual values and then not many of 'em!
Most C.C. resistors were only specified to +/– 10% – 5% or better tended to be special order bought in manufacturing quantities by OEMs!
I'm afraid the only way round this one is to get a cheap notebook, remove the YIG modules or PCBs where the resistors are most badly drifted out of tolerance, and write a shopping list out writing down how many are needed – C.C. will have been used specifically to minimize extraneous inherent self–inductance!
I would deal with the specific resistors most badly affected first, replace only these, then test your unit again between each batch of replacements, then as soon as you notice a worthwhile improvement, stop at that point!
Chris Williams
PS!
http://www.justradios.com/reskits.html#kit1BWill these help?
I appreciate it's a three–figure investment, but you can have the assurance that you're using fresh bits rather than ancient NOS from some long gone ancient repair shop, and should you need values below 2R2 in C.C., you can possibly buy them in 5s or 10s individually!