[R-390] ReCapping Question

[Mark Huss]

Bit off subject, but I came here because the level of knowledge in 
recapping is higher here. Besides, we all need a break now and again!
I have a Zenith L-600 Transoceanic in transit. Thing is Chock-of-Full of 
Paper and Black-Beautys. Drawing up a list to order from the origional 
Replacement Parts List. And noted that there are several capacitors that 
have the same value and voltage rating, but have different part numbers. 
For example; 0.01uF 400V that have different part numbers and different 
prices. Since ceramics and Micas are marked, and these are neather, the 
question begs itself, what is the difference?

Did Black Beauties have different specs than Wax?
Did Black Beauties have different specs than Ceramics?
Were Black Beauties cheaper than Ceramics?

Another is C18, C35 and C36. C18 and c35 are 120pF 500V Ceramic with one 
part number and origionally cost $0.30. But C36 is listed as 120pF 500V, 
has a different part number, and cost $0.35 origionally. Looking at the 
schematic, C35 bypasses the 16 meter tuned circuit to ground, C18 is in 
the local oscillator, and C36 bypasses all other tuned circuits besides 
16m to ground. Different properties at HF for ceramics? Why would the 
one handling the highest frequency be cheaper then the one handling the 
lower, less critical frequencies?

Anyone of the Experts want to do a paper on the differences between 
capacitors and their use depending on frequency?

-- 
----------------------------------------------------------------------
Some people are like a Slinky .. not really good for anything,
but you still can’t help but smile when you shove them down the stairs.
----------------------------------------------------------------------