[Boatanchors] [ARC5] Voltage Sequencing on 807s
jfor at quikus.com
Fri Oct 18 19:01:48 EDT 2013
> The divider is safer. Otherwise, you may apply power to the screen with no
> voltage to the plate. Under the right circumstances, the screen will then
> draw too much current and the screen could melt. Plate voltage without
> screen voltage is safer.
> John WA4WDL
> From: "J. Forster" <jfor at quikus.com>
> Sent: Friday, October 18, 2013 6:21 PM
> To: <ARC5 at mailman.QTH.net>; <boatanchors at mailman.QTH.net>;
> <boatanchors at puck.nether.net>
> Cc: <ArmyRadios at yahoogroups.com>; <Milsurplus at mailman.QTH.net>
> Subject: [ARC5] Voltage Sequencing on 807s
>> I'm looking at testing some 807s, which seems pretty straight forward.
>> And, no, I don't have a tube tester available.
>> Obviously, the heater and control grid get powered first, but what about
>> the screen and plate? Or does it even make any significant difference?
>> My original intention was to use a (decoupled) divider off B+ for the
>> screen, but at the moment, I'm inclined to use a separate supply.
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