[Hallicrafters] Orande dip, yellow tubular, and disc ceramic capacitors

[LEE BAHR]

The voltage rating of the cap is going to change the resonant frequency of 
the cap.  For example, a .01 @t 200 volts is not going to have the same self 
resonance as a .01 @1000 volt cap..  Then, with ceramics, some are multi 
layer and some are not.

Lee, w0vt

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>> We’ve been using all of the above capacitors in restoration for years and
>> haven’t had a situation where one appeared better than the other.  My
>> preference is the yellow tubular caps only because they are pleasing to
>> the eye.  The following information represents the result of testing the
>> components to enable practical, unbiased choices.  Assume measurement
>> accuracy to be +/- 5% to 10% with consideration for component variations,
>> lead lengths, and lead form.
>>
>> The .01 mfd capacitors:
>> Ceramic disc ------  Self resonant at an average 8.0Mc
>> Orange drop ------- Self resonant at  an average 10.0Mc
>> Yellow tubular ----- Self resonant at  an average 9.0Mc
>>
>> The .001 mfd capacitors
>> Ceramic disc -----Self resonant at an average 29.0Mc
>> Orange drop ----- Self resonant at an average 26.0Mc
>> Yellow tubular --- Self resonant at an average 24.0Mc
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>
> The self resonances you measured appear way off.
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>