"Chuck Grandgent" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Alright, here's a thought.
If I have the gain / drive level control all the way down (counter clockwise), and the bias were to fail, would my finals be safe ? Chuck, K1OM On Dec 16, 2007 11:17 AM, Garey Barrell <[EMAIL PROTECTED]> wrote: > > Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang > ---------------------------------------------------------------------- > 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 > > ---------------------------------------------------------------------- > > 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. > > > > > > > > > > > ---------------------------------------------------------------------- > Submissions: [EMAIL PROTECTED] > Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body > Hopelessly Lost: [EMAIL PROTECTED] - help in body of message > Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- Submissions: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
