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Re: Old dog learned a new trick [message #11362 is a reply to message #11351]

Mon, 04 December 2006 06:38

Bill Epstein
Messages: 1088
Registered: May 2009
Location: Smoky Mts. USA

Illuminati (2nd Degree)

Fried a resistor on the driver stage of the 45 amp the other day.
Bad driver tube took it out. Or bad CCS mosfet took out the tube, or...
Have had a problem with the turn-on surge of the B+. Even damaged the other channels mosfet.
In looking over the problem and replacing the bad parts at the WSOTT meeting Saturday, Steve suggested implementing a switch on the B+. With a .01uF 2kV cap across the terminals.
Last night I installed it. On the center tap connection to ground.
Just a SPST 250 VAC, 10 amp rated toggle.
Powered up and let the filaments warm up for a few minutes, then closed the switch. No flashes or crackles, which I had previously.

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[Message index]

		Boy, is this a dull forum... By: SteveBrown on Tue, 14 November 2006 17:32
		Re: Boy, is this a dull forum... By: gfederys on Wed, 15 November 2006 08:23
		Re: Boy, is this a dull forum... By: SteveBrown on Wed, 15 November 2006 10:04
		Re: Boy, is this a dull forum... By: gfederys on Wed, 15 November 2006 10:21
		Re: Boy, is this a dull forum... By: SteveBrown on Thu, 16 November 2006 07:27
		Re: Boy, is this a dull forum... By: gfederys on Thu, 16 November 2006 08:26
		Well... By: PakProtector on Thu, 04 January 2007 18:20
		Re: Well... By: gfederys on Mon, 08 January 2007 07:49
		Another Way By: Skip on Fri, 17 November 2006 12:31
		Subject should be: About the V-Caps By: Skip on Fri, 17 November 2006 12:33
		Re: Subject should be: About the V-Caps By: SteveBrown on Fri, 17 November 2006 14:34
		Subject should be: About the V-Caps By: Skip on Fri, 17 November 2006 15:02
		Re: Old dog learned a new trick By: Bill Epstein on Mon, 04 December 2006 06:38
		Re: Old dog learned a new trick By: Shane on Tue, 05 December 2006 18:33
		Re: Old dog learned a new trick By: SteveBrown on Fri, 08 December 2006 12:05
		Re: Old dog learned a new trick By: randle on Sat, 07 April 2007 21:59

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