[Drake] R4B noise

[Garey Barrell]

Ed -

C90A is a screen bypass on the 6EH5 audio output tube.   Depending upon 
your serial number, and which schematic you have, it may or may not be 
there!

GOOD multi-section FP style cans are getting very hard to find.  You'll 
probably end up having to stuff one or more sections under the chassis. 
  Fortunately there is plenty of room!

73, Garey - K4OAH
Atlanta


ed brooks wrote:
> My R4B is starting to sound a wee dab raspy.   So far I haven't opened 
> the cover (if I had I would just trace out the wiring) but was browsing 
> the schematic to see what filters are in the line.  Seems C90 is the can 
> of suspicion.  But on the schematic I find C90B, C90C and C90D.  I have 
> searched with these old eyes for C90A and can't find it. Guess I could 
> get out the magnifying glass.  But section A may not even be used.  B, 
> C, and D, are all 100 mf at 200 v.  If A is used, (and it may not be) 
> can some one help me avoid eye strain and tell me in what circuit?!!  Or 
> will I be relegated to pulling the covers and tracing the circuit?  And 
> where can I find a suitable replacement can if it turns out that is what 
> is needed?  (Surplus Sales didn't list any such animal under four 
> section cans.) Thanks
> Ed, W5HTW
> 
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