[R-390] C227 Bypass Question

[dmartin]

Regarding C227, the .047 pf oil filled, chassis mounted bypass of the cathode of V201, 
the rf amp tube:

1. This cap was augmented with a field change that added an additional 47 pf cap, 
C257, in parallel and mine has it. Seems to me if 47,000 pf isn't quite enough to 
start with, 47 more pf doesn't really help? When replacing the C227/C257 combination 
with a new single bypass, what would a new recommended value be?

2. Would one of the modern, tubular, axial lead yellow poly caps be OK in this 
application? I seem to recall a general rule of thumb that suggests poly-type and 
Orange Drop-type caps as best for audio to IF and ceramic and mica for RF bypass 
applications?

Thanks!

Dan
WB4GRA


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