[R-390] rebuilding RF transformers

[Flowertime01 at wmconnect.com]

Scott,

There is nothing magic about the caps per say. They are very small 
packages. The variable caps are all the same. Then a fixed cap was added to get a 
mid range on the variable to make up the circuit. Over an hour or so, 
temperature in the cans of the RF deck are fairly stable, and the circuit is just 
band pass, so cap value drift with temperature is not the most critical 
function of the caps. Any good mica with in tuning range should work. You can go 
with some longer lead length and use a bit larger package.

You may want to ask for a whole transformer here on the list and just go 
that rough.

You could have a hair line crack in the core giving you problems. So you 
mite ask for a transformer and core. There are only two flavor of cores in the 
R390/A RF deck (RF and IF) so having a spare core is not bad. And then you 
would have a spare variable trimmer cap parts also.

Roger AI4NI