Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Geoff -
No, the problem in this case is purely the result of the finals
"saturating" (to use a SS term) when there is no grid bias applied.
They do NOT have an I-DSS like a FET either!
Put another way, a SS final is normally "off" with no bias, and a tube
final is normally "on".
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
Geoffrey S. Mendelson wrote:
"Geoffrey S. Mendelson" <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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On Sun, Dec 16, 2007 at 10:24:48AM -0500, Mike Bryce wrote:
Do you want to put the protection inside the power supply?
That brings up a question in my mind. Is the actual cause of damage
to the finals the failure of the bias circuit, or is it due to the
finals being overdriven? In that case wouldn't a device in the power
supply which limits the power supplied to the rig to a safe level
be a better idea, or an "overdrive" cut out?
For example, in a transitor rig there is often some sort of
protective circuit to prevent the finals from being destroyed
if they draw too much current. Many Japanese rigs use limiters
o "fold back" circuits.
Ten-Tec does not use one, instead they includea saftey cut out in their
power supplies.
Could a similar circuit be devised and used in this case?
Geoff.
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