[Amps] Using door knob caps as padders/blockers

[Richard]

>> First, Ameritron does not use mica's in the tank of higher power
>> amplifiers. Never has, probably never will.
>>
>> They switched to ceramic chip capacitors because the doorknobs they
>> had used for years suddenly failed to meet temperature vs capacitance
>> change ratings when HEC starting using tooling or materials purchased
>> from ITT-Jennings.
>
>I stand corrected, everyone!
>I thought the Ameritron caps were mica...my mistake.
>
>I do know that every SB-1000 I have tuned up on 160 meters
>has the same drift problem. I have cured that problem on several
>occasions with the Ameritron CERAMIC chip caps. With
>a single 3-500Z, voltage is not a problem in the loading
>section of a PI-L tank as it would be with a legal-limit amp.
>They seem to be adequate. I see that the AL-1500 used 500pf
>door knobs . Do they still do? 

[]  500pF 5kV doorkobs - such as the 58-series - are typically designed 
for bypass service, not tuned-circuit service.

>...

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
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