Gad, Sir.
Anyone who reads QST for 1928 or thereabouts knows that one uses Xmas tree
lights to make an artificial filament centre tap!
73
end
Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
NEW ZEALAND
www.waiheke.co.nz/signal.htm
----- Original Message -----
From: Peter Chadwick <Peter.Chadwick@zarlink.com>
To: 1AMPS <amps@contesting.com>; 'G8GSQ' <g8gsq@qsl.net>
Sent: Thursday, 01 November, 2001 12:00 AM
Subject: RE: [AMPS] Henry 1KD5 Rectifier question
>
> Steve says:
>
> >Does it matter (or even does it happen) that you will get more current
> flow
> >out of the +ve end of the filament?
>
> I suppose it would have some effect, but as the cathode current (as
opposed to
> the filament current) is so much less, I doubt it would make much
difference.
> Reversing the polarity of the filament supply periodically would seem the
best
> way to avoid metal migration problems: an artificial centre tap with a
couple of
> resistors across the filaement for the HV return would be best way to feed
the
> HV return, although they would need to fairly low resistance to avoid the
> introduction of unwanted cathode bias.
>
> 73
>
> Peter G3RZP
>
>
>
> --
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>
>
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