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1. [AMPS] Blow TL922 (score: 1): Author: Helmut (DF7ZS)" <df7zs@gmx.net (Helmut (DF7ZS)); Date: Thu, 24 Feb 2000 12:33:30 +0100; Hi there. I have a TL922 by Kenwood and the folowing happend to it: On Standby-Mode (after some minutes operation) I heard a loud "bang" . As I looked on the panel the IP-Meter was showing 500mA. Rem; /archives//html/Amps/2000-02/msg00543.html (8,363 bytes)
2. [AMPS] Blow TL922 (score: 1): Author: 2@vc.net (measures); Date: Thu, 24 Feb 2000 06:28:19 -0700; The 922 occasionally oscillates at c. 120MHz. The oscillation temporarily causes the tubes to conduct, thereby arcing the contacts of the cathode bias relay. . Since the tank is a LPF, there is esse; /archives//html/Amps/2000-02/msg00549.html (9,470 bytes)
3. [AMPS] Blow TL922 (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Thu, 24 Feb 2000 09:52:00 -0500; Rich, wouldn't it be reasonable to surmise that he's lost the cut-off bias, perhaps because of a contact failure in the much-maligned TL-922 T/R relay? That would certainly explain the plate current; /archives//html/Amps/2000-02/msg00550.html (8,799 bytes)
4. [AMPS] Blow TL922 (score: 1): Author: Donald.Kessler@wpafb.af.mil (Kessler Donald J LtCol HQ AFMC/DOOT); Date: Thu, 24 Feb 2000 10:57:03 -0500; Helmut, et. al., I don't have the schematic in front of me right now and am working from memory... I would suspect that the bias zener diode is shorted. This 7.5 V zener bias diode is stud-mounted to; /archives//html/Amps/2000-02/msg00551.html (10,454 bytes)
5. [AMPS] Blow TL922 (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Thu, 24 Feb 2000 16:36:26 -0000; bias, relay? That was what I thought too, but the 3-500Z is a zero bias tube, so it would be unlikely to take 500mA even if the grid was grounded. I surmise there has been an arc, this has blown the; /archives//html/Amps/2000-02/msg00552.html (9,051 bytes)
6. [AMPS] Blow TL922 (score: 1): Author: 2@vc.net (measures); Date: Thu, 24 Feb 2000 10:47:05 -0700; a possibility Although the cathode bias contacts in the relay can temporarily arc, I have never heard of one with welded contacts. Ip on standby is usually caused by a shorted tube. If this situatio; /archives//html/Amps/2000-02/msg00555.html (9,257 bytes)
7. [AMPS] Blow TL922 (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Thu, 24 Feb 2000 15:22:45 -0500; But as you pointed out, in a previous post, " If you have output, the tubes can not be shorted, so there should be no Ip on standby." In my SB-220, the bias contacts were sticking both closed and ope; /archives//html/Amps/2000-02/msg00556.html (8,685 bytes)
8. [AMPS] Blow TL922 (score: 1): Author: 2@vc.net (measures); Date: Thu, 24 Feb 2000 13:34:47 -0700; - Hence, the mystery. wow Time for the high speed switching. mod. beats me later, Pete -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests:; /archives//html/Amps/2000-02/msg00558.html (8,613 bytes)
9. [AMPS] Blow TL922 (score: 1): Author: Helmut (DF7ZS)" <df7zs@gmx.net (Helmut (DF7ZS)); Date: Fri, 25 Feb 2000 09:05:06 +0100; HERE IS THE STATUS SO FAR !!! Hi there. Thanks for all these useful replys. I never used such a great source like this one. I located the zenner diode as defective but it takes about 1-2 weeks to get; /archives//html/Amps/2000-02/msg00566.html (10,440 bytes)
10. [AMPS] Blow TL922 (score: 1): Author: 2@vc.net (measures); Date: Fri, 25 Feb 2000 02:53:59 -0700; The zener diode can be replaced with a series of c. 7, 1A forward-biased diodes. Such an arrangement is much more rugged than a zener. The 470uH grid choke can be replaced with a 1/4 to 1/2 W carbon; /archives//html/Amps/2000-02/msg00568.html (12,194 bytes)
11. [AMPS] Blow TL922 (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Fri, 25 Feb 2000 11:25:09 -0000; The zener diode can be replaced with a series of c. 7, 1A forward-biased diodes. Such an arrangement is much more rugged than a zener. And also poor regulation - Does it really matter ? If you are do; /archives//html/Amps/2000-02/msg00569.html (8,504 bytes)
12. [AMPS] Blow TL922 (score: 1): Author: 2@vc.net (measures); Date: Fri, 25 Feb 2000 05:18:55 -0700; The cathode current varies from c. 160mA to c. 1000mA. The resultant <1v variation in forward drop across the diode string is not very significant compared to the approx 115v of driving signal. With; /archives//html/Amps/2000-02/msg00570.html (8,784 bytes)
13. [AMPS] Blow TL922 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 25 Feb 2000 12:52:09 +0000; The TL431 circuit is at: http://www.ifwtech.demon.co.uk\g3sek\boards\triode\triode-3.htm It's fully adjustable and certainly cheaper than a large zener. I don't really know how the IMD varies with ca; /archives//html/Amps/2000-02/msg00572.html (9,345 bytes)
14. [AMPS] Blow TL922 (score: 1): Author: Helmut (DF7ZS)" <df7zs@gmx.net (Helmut (DF7ZS)); Date: Mon, 28 Feb 2000 08:13:57 +0100; Quite a succesful weekend working on my TL922... I replaced the 470uH L2's with a R 27 Ohm and a 1000pF C. There is already a 220pF C in place. The Zennerdiode ZX 7,5 was replaced by a 6.8 V 1 watts; /archives//html/Amps/2000-02/msg00623.html (11,063 bytes)
15. [AMPS] Blow TL922 (score: 1): Author: 2@vc.net (measures); Date: Mon, 28 Feb 2000 09:22:30 -0700; If you do not have glitch diodes across both meters, you are playing Lotto with the delicate meter movements. ? A new world record!. At such a fil V one would receive 4% of the normal emissive life.; /archives//html/Amps/2000-02/msg00633.html (12,664 bytes)
16. [AMPS] Blow TL922 (score: 1): Author: Helmut (DF7ZS)" <df7zs@gmx.net (Helmut (DF7ZS)); Date: Tue, 29 Feb 2000 08:28:04 +0100; Hi Rich ! HEATING VOLTAGE TL922 ? A new world record!. At such a fil V one would receive 4% of the normal emissive life. . Looks like this is so far off that I guess the swaped wires are not enoght t; /archives//html/Amps/2000-02/msg00643.html (8,391 bytes)
17. [AMPS] Blow TL922 (score: 1): Author: 2@vc.net (measures); Date: Tue, 29 Feb 2000 00:49:35 -0700; You need to drop 5.5v - 4.8v = 0.7v. The current is c. 15a. R = 0.7/15 = .047-ohms, so a pair of 0.0235-ohm resistors would be needed. However, 24ga. TFE insulated wire will carry 15a in free air, s; /archives//html/Amps/2000-02/msg00645.html (8,386 bytes)

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