Re: B&W HV cages...regulation failing...

Of course old wires like that will either leak, and or regardless of age, be a 25khz radio transmitter. Either way, the energy is going out. Remember, it's a tesla coil. Without the CRT which acts as a huge filter cap, the anode voltage is AC.

jS

----- Original Message -----
From: "John Robertson" <pinball@telus.net>
To: <vectorlist@vectorlist.org>
Sent: Saturday, February 21, 2009 2:51 AM
Subject: VECTOR: B&W HV cages...regulation failing...

> OK, I've got a couple of WG HV cages for Asteroids and both are croaking
> when warm.
>
> What appears to happen is the HV diode is getting hot just sitting on the
> bench, but not connected to anything other than the HV lead! Ihave
> replaced the HV lead with another from another flyback (colour) and the
> diode still heats up.
>
> Have cleaned the wire, and support post, yet somewhere there is a current
> leak. Have insulated the wire with a silicone collar where it goes through
> the metal cage (and the plastic bit there).
>
> Now, if I remove the outside half of the HV wiring - from the positive end
> of the HV diode - and simply cap the diode with a plastic pen cap, then
> the voltage regulation is stable, and the diode stays cool - as expected.
>
> However if I then put the HV wire back on the diode (carefully replaced
> insulators of course!) the sucker gets hot and the HV regulation fails
> (voltage drops). Note that the anode cap is sitting inside a very clean,
> insulated ceramic mug for isolation and safety (mine!).
>
> Very curious! Will continue working on it in the next day or two and
> report my findings - but this seems to have a bearing on why some cages
> just seem to die and yet, may be good if the cause of the leakage is
> found...
>
> John :-#(#
>
> --
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
> (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
> www.flippers.com "Old pinballers never die, they just flip
> out"
>
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Received on Sat Feb 21 10:58:05 2009