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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 21st Jan 2021, 9:53 pm   #1
Alan_G3XAQ
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Default Wanted: 2-gang 10pf-360pF airspaced variable capacitors

This is a continuation of my 3-gang capacitor quest. It seemed sensible to start a new thread with a new title.

Experiments show I can make a preselector for 1.8-30MHz in just two ranges as long as I can find twin gang 360pF variables with a low minimum capacitance. 20pF is just usable but 10pF minimum would be better. The old Jackson Bros Type 00 fits the bill. I don't need trimmers nor is a built-in reduction required, in fact either would be a show stopper unless they can be removed. Tracking with trimmers and padders reduces the capacitance swing, which is not what I want. Instead I plan on driving the capacitors individually with RC type servos and a microprocessor (PIC, Arduino, Rpi, etc).

So please have a rummage in your junk box (aka valuable storage facility) and let me know if you have one or more of these twin gang variables you can sell me. There must have been tens of thousands made post war until transistor radios with plastic tuning capacitors became de rigeur.

Thanks, Alan G3XAQ
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Old 22nd Jan 2021, 8:57 am   #2
Ed_Dinning
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Default Re: Wanted: 2-gang 10pf-360pF airspaced variable capacitors

Hi Alan, would a higher max cap be a problem; some of the earlier ones were 500pf

Ed
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Old 22nd Jan 2021, 10:09 am   #3
Alan_G3XAQ
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Default Re: Wanted: 2-gang 10pf-360pF airspaced variable capacitors

No, Ed. 500pF would be fine so long as the minimum is not more than 20pF.

Alan
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Old 22nd Jan 2021, 10:16 am   #4
snowman_al
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Default Re: Wanted: 2-gang 10pf-360pF airspaced variable capacitors

I have a 12pF to 420 (ish) pF dual cap that measures 50 x 40 x 35mm.
For a small donation to Alzheimer's.
PM me if interested, Alan
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Old 22nd Jan 2021, 4:15 pm   #5
Ed_Dinning
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Default Re: Wanted: 2-gang 10pf-360pF airspaced variable capacitors

Hi Alan, I have 2 off 3 gang 450-16pf and 2 off 2 gang 450 to 16pf variable caps if you are interested. See pictures below
There are 2 sizes of 3 gang cap shown, but I also have a similar 3 gang to the smaller one that has easily removable trimmers.

These were measures on the Heathkit capacity meter.



Ed
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