>I see that Surplus of Neb. has Sprague High Voltage Mica
>Doorknob Capacitors available. Will these be proper
>replacements for the door knobs in my SB-1000?
? Yes, Phil.
>They're
>rated at around 30 kv and seem to be reasonable in size
>and should be fittable into the space. I plan to use
>this amp on 160M primarily. Phil KB9CRY
>>
>>
>> >> The doorknob capacitor in the Heath is within its current ratings,
>> >> assuming you know how to read manufacturers data. I suspect it might
>> >> be within the rating in the ETO also.
>> >
>> >Current rating has nothing to do with the ETO and Heath problems.
>> >They get too hot and change value. The power output on 160 meters
>> >changes after tune-up. The micas don't do this.
>> >
>> Mica dielectric caps are good for 160m and 80m tank padders, however,
>> opposite to barium titanate dielectric "doorknob" caps, mica cap's
>> current-carrying ability decreases as freq. increases. Micas are at
>> their best below 5MHz.
>>
>> cheerz, Phil
>>
>> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
>> www.vcnet.com/measures.
>> end
>>
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>
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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