[R-390] C609 replacement

Drew Papanek [email protected]
Fri, 15 Aug 2003 11:44:50 -0400


Wayne wrote:

" I need to replace this capacitor.   Should it be the same tantalum type?
Why is  this type used for this circuit is there something critical about 
it?"

C609 is the cathode bypass cap for the first audio amplifier stage.  That is 
not a critical circuit.  I believe tantalum was used to achieve performance 
over the entire military temperature range.

In the sheltered lives that most of our R-390(*) lead, aluminum electrolytic 
would be more than adequate.  For a few dimes more you can use a tantalum 
part.  The 35v rating is not necessary; even with the tube shorted plate to 
cathode C609 would not see more than about 6v.

Drew

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