Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn)
Date: Wed, 12 May 1999 08:45:37 -0600
Rich, Ian & all... Am I missing something? There's no reason for the cathode and bias circuit to go way negative when the "glitch resistor" is in the negative HV lead and a +HV arc occurs. Putting th
? good point, Dick. However, the problem of additionally insulating the neg. HV circuit is obviated by putting the glitch-R in the positive HV lead -- as is recommended by numerous power grid tube m
Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn)
Date: Wed, 12 May 1999 12:22:07 -0600
Rich et al... 1. I doubt that the manufacturers' recommendations are meant to dissuade users from negative-lead resisting - more likely that the + line is more "obvious" and they didn't give it a tho
? If the glitch-R is on the neg side of the anode-current meter shunt resistor, it should act to limit peak fault current -- provided that the insulating ability of the neg. HV circuit is equal that
I see it exactly the same as you, Dick. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon.co.uk/g3sek -- FAQ on WWW: http://www.contes
SNIP IMO you want a diode that can handle the discharge current thru the resistor and still survive. Look at the Ameritron big amps and they all use a wimpy 1N4000 series which goes up in smoke at th
Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn)
Date: Mon, 17 May 1999 13:35:48 -0600
No argument, Norm, although if I remember right the '5404 is rated for 400A surge for a longer time than a typical HV filter cap takes to discharge through a 20-50 ohm suppression resistor (~100A pea