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Old 18th Oct 2023, 1:44 pm   #1
John10b
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Default Eddystone 840C receiver.

Came across this in collectibles shop, no price on it.
John
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Old 18th Oct 2023, 2:11 pm   #2
G6Tanuki
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Default Re: Eddystone receiver.

If it works, it's probably worth around £40-£50.

It's a somewhat basic HF RX, one RF stage, one IF stage, 465KHz IF and no xtal filter so rather 'wide' in the IF (not good for SSB/CW, but OK for broadcast entertainment listening) and also prone to images above 10MHz.

B8-style 100mA valves

Also, no voltage-stabilisation for the local oscillator so on the upper HF bands the RF Gain control shifts the LO by quite a bit...

And it's AC/DC meaning potentially a 'hot' chassis.

[I have its predecessor the 840A here].
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Old 18th Oct 2023, 2:55 pm   #3
John10b
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Default Re: Eddystone receiver.

Thank you for your quick reply and technical information.
John
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Old 18th Oct 2023, 3:16 pm   #4
Sideband
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Default Re: Eddystone receiver.

Yes it looks quite impressive but the performance is somewhat disappointing. I never got mine to work really well. Acceptable (just) up to about 14Mhz but beyond that....well!
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Old 18th Oct 2023, 11:05 pm   #5
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Default Re: Eddystone receiver.

A nice tuning drive (and this 'C' model got the clever linearising mechanism that reduces the usual scale cramping at the HF end) and neat, sturdy mechanical detailing let down by rather humdrum electronics. Still, not a bad basic SWL set if it's at the right price, bearing in mind the above caveats and particularly the AC/DC power supply arrangements- check that a previous owner hasn't defeated the chassis-to-case isolation through incorrect re-assembly!
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