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Sets, Parts and Service Information Offered (private sellers only, exact price required, no swaps) You may announce components or sets for sale or offered free here. Private collectors only - no traders. You must include an exact price. No swaps.

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Old 17th Oct 2019, 2:09 pm   #1
llama
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Default Homebrew valve TX(?) FOC inc P&P

Another item I have had for a long while and just keep moving from one shelf to another. I don't know its origins but it might be useful to someone.

Built on an aluminium chassis it has a B7G valve-holder and an Octal valve holder. My speculation, based on very little, is that its XTAL oscillator is based on an EF91 which in turn drives perhaps a 6V6. The large coil visible is a 4-pin plug-in jobbie and the crystal underneath is the large military surplus type. I don't know the frequency so someone will have the joy of discovering that. The windings on the coils are approximately 40 turns (Top band?) with about 6 turns on top.

It's FOC and I won't charge P&P because it's worth it to me to have it out of the way and re-purposed.

Graham
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Old 17th Oct 2019, 6:52 pm   #2
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Default Re: Homebrew valve TX(?) FOC inc P&P

Possibly a pantry MW transmitter?

Peter
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Old 18th Oct 2019, 12:12 am   #3
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Default Re: Homebrew valve TX(?) FOC inc P&P

I reckon it's a crystal calibrator, albeit possibly one that outputs more watts than is usual for such a device.

Al.
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Old 20th Oct 2019, 4:31 pm   #4
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Default Re: Homebrew valve TX(?) FOC inc P&P

Hi,
if no one else is interested, then I would be.
I am happy to cover any packing / postage costs or make a contribution to Charity if you prefer
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Old 21st Oct 2019, 2:07 pm   #5
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Default Re: Homebrew valve TX(?) FOC inc P&P

I've had a few expressions of interest for this (here and PM) so I'll leave it a couple of days and then hold a hat event.
Graham
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Old 23rd Oct 2019, 10:27 pm   #6
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Default Re: Homebrew valve TX(?) FOC inc P&P

Hi Graham, can I withdraw please, thanks Billy.
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Old 24th Oct 2019, 8:29 am   #7
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Default Re: Homebrew valve TX(?) FOC inc P&P

Hi,
I would like to withdraw as well, please.
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Old 24th Oct 2019, 3:50 pm   #8
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Default Re: Homebrew valve TX(?) FOC inc P&P

I've popped out the crystal and it's inscribed 1.913 m/c - so it's Top Band!
I don't know if that's a commonly used frequency but at least it's legal.
Might be of interest.
Graham
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Old 25th Oct 2019, 12:09 pm   #9
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Default Re: Homebrew valve TX(?) FOC inc P&P

I'll have it, please, Graham, if it's still there. I'll PM you regarding pickup.
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Old 4th Nov 2019, 3:20 pm   #10
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Default Re: Homebrew valve TX(?) FOC inc P&P

Now gone to Bryan - thanks for doing the pick-up.
Graham
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