[Amps] Plate Bypass Capacitor

[Robert Groh]

I would strive to keep the total capacity as close to 0.1 uF as possible with, of course, the appropriate voltage rating.  The capacitor value, per se, is not that critical but (for example) a 0.05 uF disk ceramic would be preferable to a 0.01 uF.  Disk ceramics (non-NPO variety) do exhibit some capacity variation with changes in voltage which does not (to my knowledge) occur with a paper. However disk ceramics have a long and successful history in exactly the type of service you are talking about so I am probably being way over cautious here. 

So fine for use of disk ceramics.  Use multiples to get close to 0.1 uF (or at least I would!).

73
Bob, WA2CKY




________________________________
From: David C. Hallam <dhallam at rapidsys.com>
To: AMPS <amps at contesting.com>
Sent: Tuesday, August 4, 2009 10:00:02 AM
Subject: [Amps] Plate Bypass Capacitor

I am restoring a SBE-33 transceiver, don't ask why, and the plate bypass 
capacitor is a 0.1 uF paper capacitor.  There is also a 0.1 uF paper 
capacitor as a cathode bypass on the pair of PL-500's. Is there any 
reason why I shouldn't replace these with 0.001 or 0.01 ceramic disks?

David
KC2JD/4

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