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1. [AMPS] Zener screen supplies (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 12 Apr 2001 09:13:55 +0100; A different aspect to consider - what happens when there is anode-screen flashover. I inherited a PSU (with 10x33V/5W zener screen supply) from a friend. A dud tube caused a flashover and lots of dam; /archives//html/Amps/2001-04/msg00264.html (8,240 bytes)
2. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Thu, 12 Apr 2001 08:44:32 -0700; ? My guess is that the zeners shorted. In such a case, shorted (0 volts) zeners cause no damage. (10) 5w zeners only cost around 11 dollars. ? The 10 x 33v zeners would have shorted at far less than; /archives//html/Amps/2001-04/msg00268.html (9,319 bytes)
3. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 12 Apr 2001 20:18:27 -0400; .....and you can win the lotto by buying only one ticket! Think about the problem a little bit. The screen has to rise to probably a thousand volts or more to give any transient protection time and; /archives//html/Amps/2001-04/msg00286.html (9,076 bytes)
4. [AMPS] Zener screen supplies (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 13 Apr 2001 09:11:20 +0100; Shorted zeners need replacing - I don't want to have to re-build the PSU every time. They surely did. Agreed - my point was that a screen circuit designed to run at 10ish mA isn't an obvious place to; /archives//html/Amps/2001-04/msg00292.html (9,982 bytes)
5. [AMPS] Zener screen supplies (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 13 Apr 2001 09:18:32 +0100; --Original Message-- From: Tom Rauch <w8ji@contesting.com> To: amps@contesting.com <amps@contesting.com>; Steve Thompson <g8gsq@qsl.net> To: <amps@contesting.com> Date: 13 April 2001 01:16 Subject: R; /archives//html/Amps/2001-04/msg00293.html (10,229 bytes)
6. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Fri, 13 Apr 2001 06:54:35 -0700; To: <amps@contesting.com> Zeners are hard clamps when they short. You can not use steering diodes because you need to provide a path to the zener-string for reverse screen current. Anode/screen flas; /archives//html/Amps/2001-04/msg00296.html (10,928 bytes)
7. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 13 Apr 2001 11:00:33 -0400; It would be identical to what you would do with a more complex regulator. I'd use a series diode string to the screen with a properly designed resistance across that diode string for reverse current; /archives//html/Amps/2001-04/msg00297.html (9,693 bytes)
8. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 13 Apr 2001 08:46:21 +0100; [...] You can't generalize either way on the basis of complexity alone. Complex circuits can offer design opportunities that don't exist in simple circuits; but they also have more to go wrong. In th; /archives//html/Amps/2001-04/msg00300.html (12,570 bytes)
9. [AMPS] Zener screen supplies (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 13 Apr 2001 18:49:24 +0100; --Original Message-- From: Tom Rauch <w8ji@contesting.com> To: amps@contesting.com <amps@contesting.com>; Steve Thompson <g8gsq@qsl.net> To: <amps@contesting.com> Date: 13 April 2001 16:09 Subject: R; /archives//html/Amps/2001-04/msg00301.html (9,858 bytes)
10. [AMPS] Zener screen supplies (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 13 Apr 2001 19:53:54 +0100; My, you must have led a sheltered life... 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.contesting.c; /archives//html/Amps/2001-04/msg00302.html (9,145 bytes)
11. [AMPS] Zener screen supplies (score: 1): Author: John_Nelson@compuserve.com (John Nelson); Date: Fri, 13 Apr 2001 16:57:10 -0400; Message text written by "Ian White, G3SEK" one.< I've had dozens, many admittedly self-induced whilst developing and testing protection circuitry. On the basis of personal experience together with wh; /archives//html/Amps/2001-04/msg00305.html (9,173 bytes)
12. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 13 Apr 2001 21:46:59 -0400; That's right, they don't clamp hard. The initial arc is also discharging capacitance beyond the current limiting resistor. VDR's are poor clamps, plus the initial transient can be very large compare; /archives//html/Amps/2001-04/msg00308.html (10,097 bytes)
13. [AMPS] Zener screen supplies (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 13 Apr 2001 21:46:59 -0400; Rich is almost certainly talking about triodes and pentodes Ian, not tetrodes....where they are somewhat common. Anode to screen flashovers are rare in tetrodes and never happen in triodes. 73, Tom; /archives//html/Amps/2001-04/msg00309.html (9,317 bytes)
14. [AMPS] Zener screen supplies (score: 1): Author: conrad.farlow@virgin.net (conrad.farlow@virgin.net); Date: Sat, 14 Apr 2001 03:21:08 +0100; Tom tell me that was riddled with typos :) please!!!! Regards Conrad G0RUZ Very rare in triodes I should imagine :) -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com; /archives//html/Amps/2001-04/msg00310.html (9,911 bytes)
15. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Fri, 13 Apr 2001 19:27:46 -0700; Amen, Tom. codswallop With a zener-string screen regulator, operated through a high resistance from the anode supply current limiting is automatic. Why protect the screen in a bad tube? Why would an; /archives//html/Amps/2001-04/msg00311.html (14,287 bytes)
16. [AMPS] Zener screen supplies (score: 1): Author: jeff@wa1hco.mv.com (jeff millar); Date: Fri, 13 Apr 2001 22:29:06 -0400; Sound right to me, Triodes almost never exhibit flashovers the screen. -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contes; /archives//html/Amps/2001-04/msg00312.html (9,336 bytes)
17. [AMPS] Zener screen supplies (score: 1): Author: 2@vc.net (measures); Date: Fri, 13 Apr 2001 21:34:59 -0700; chortle. Conrad -=- Roughly how many tubes have you autopsied? thanks - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contest; /archives//html/Amps/2001-04/msg00313.html (9,974 bytes)
18. [AMPS] Zener screen supplies (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sat, 14 Apr 2001 09:13:44 +0100; --Original Message-- From: measures <2@vc.net> To: Ian White, G3SEK <g3sek@ifwtech.com>; AMPS <amps@contesting.com> To: <amps@contesting.com> Date: 14 April 2001 03:39 Subject: Re: [AMPS] Zener scree; /archives//html/Amps/2001-04/msg00316.html (11,529 bytes)
19. [AMPS] Zener screen supplies (score: 1): Author: k8cpa@arrl.net (chuck); Date: Sat, 14 Apr 2001 07:01:52 -0400; *Soapbox Mode* Naw.... Everyone knows Rich measures is a dumb ass. ANYONE who says...."just take the fuses out and let the house breakers handle it" is a true blue, 100% USDA MORON! 73 and take it f; /archives//html/Amps/2001-04/msg00317.html (9,406 bytes)
20. [AMPS] Zener screen supplies (score: 1): Author: dcckc@ncn.net (dcckc); Date: Sat, 14 Apr 2001 06:12:40 -0500; pentodes Ian, not who breakers handle it" is a Mailing list http://www.contesting.com/FAQ/amps -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative reques; /archives//html/Amps/2001-04/msg00318.html (9,915 bytes)

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