[R-390] Tantalum or not Tantalum

[Roger L Ruszkowski]

  Just a simple question. Is it better to replace the famous 8uF
cap in the audio section with a tantalun cap or just a normal
electrolytic?

Best 73s
Guido Santacana KP4FAR
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Guido,

Cap technology has come so far since the 1950's there
are many wonderful new caps that will work.

Today the question is how much cap can you get into the space?

The replacement need not be a 8, a 10 - 20 will work very nice.

It need not be any magic kind. What ever you can find with Axial leads.

Check this against the schematic. I think it is a cathode bypass cap.
I was rated at 250 volt in case the tube shorted.

If the new cap is not going to splatter acid all over the place if it
fails,
it need not even be rated for the full voltage.

If the tube does short a low voltage (50volt) cap will fail.

If your going for exact historical replacement then you need the
real time.

If your going for functionality, then any 8 - 25 at 25 or more volts that
fits in the space will work.

Roger.