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1. [AMPS] Blown TL922A... What to do? (score: 1): Author: g.m.mcadams@worldnet.att.net (Gary McAdams); Date: Mon, 4 Sep 2000 18:18:04 -0700; Hell gents. As the subject line indicates, I've got a little problem with my Kenwood TL-922A. The background is that this amp has been in storage for a long time, almost a decade. We have moved a few; /archives//html/Amps/2000-09/msg00086.html (9,602 bytes)
2. [AMPS] Blown TL922A... What to do? (score: 1): Author: g.m.mcadams@worldnet.att.net (Gary McAdams); Date: Mon, 4 Sep 2000 20:18:58 -0700; Hi all, Me again... Thanks to Pete, N4ZR for a quick response! I pulled the first tube. This is the one on the left as you face the amp. Plugged in the 240 volts... so far so good. I triggered the HV; /archives//html/Amps/2000-09/msg00089.html (10,093 bytes)
3. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Tue, 5 Sep 2000 00:15:03 -0700; ? The clear and present danger in a 922 is burning bandswitch contacts. (See real toasty bandswitch photo in "Parasitics Revisited", Sept/Oct, 1990 *QST* -- photo also on my Web site). The 922 bands; /archives//html/Amps/2000-09/msg00091.html (9,870 bytes)
4. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Tue, 5 Sep 2000 00:14:58 -0700; ....... A suitable means of limiting current is to remove the two fuses and temporarily attach two, 60w to 100w, 120v lamps across the fuse holders. The mode switch should be set to CW. ? downtown pu; /archives//html/Amps/2000-09/msg00093.html (12,156 bytes)
5. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 5 Sep 2000 11:19:00 -0400; The worse thing in the world for 3-500Z's is to have them used in an amplifier, especially one with marginal cooling, and then store them away for months. The tubes getter themselves (remove gas) by; /archives//html/Amps/2000-09/msg00101.html (10,526 bytes)
6. [AMPS] Blown TL922A... What to do? (score: 1): Author: dcckc@ncn.net (dcckc); Date: Tue, 05 Sep 2000 13:46:31 -0500; Now I understand the Grate parasitic debate and how long standing debates become feuds but do we really have a serious debate on the cooling capacity of the TL922A ? I thought that the good cooling; /archives//html/Amps/2000-09/msg00112.html (9,215 bytes)
7. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 5 Sep 2000 15:23:52 -0400; Please read my post carefully and correctly. I said the cooling system in the TL-922 was not adequate to cook the tubes in at 300-400 watts dissipation. That is a continuous duty application. If you; /archives//html/Amps/2000-09/msg00113.html (9,469 bytes)
8. [AMPS] Blown TL922A... What to do? (score: 1): Author: N6BUU@aol.com (N6BUU@aol.com); Date: Tue, 5 Sep 2000 16:34:48 EDT; << not adequate to cook >> TOM: u mean cool....right? hank -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Prob; /archives//html/Amps/2000-09/msg00114.html (8,784 bytes)
9. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Tue, 5 Sep 2000 14:12:14 -0700; The 922 has an anode supply that has a continuous capacity of c. 250w per tube. This is not possible because the power supply will shut down due to excessive heat buildup. // I did a test of the coo; /archives//html/Amps/2000-09/msg00116.html (10,457 bytes)
10. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Tue, 5 Sep 2000 14:12:16 -0700; ? One of the debators tested the 922's cooling ability, and one debator probably only pontificated about it. // The Grate Parasitic Debate is no longer controversial. The missing piece of the parasi; /archives//html/Amps/2000-09/msg00117.html (10,725 bytes)
11. [AMPS] Blown TL922A... What to do? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 5 Sep 2000 22:08:45 +0100; That is no proof of a parasitic. The grid current meter is in the return path from chassis to B-minus, so a DC arc from B+ to chassis will pin that meter with no RF involvement whatsoever. 73 from Ia; /archives//html/Amps/2000-09/msg00119.html (8,995 bytes)
12. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 5 Sep 2000 19:06:45 -0400; No, I mean cook. The context of my post was "cooking" the tube anodes to de-gas the tubes by running the tubes at 300-400 watts dissipation for several hours. You would NOT want to do that even for; /archives//html/Amps/2000-09/msg00120.html (9,177 bytes)
13. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 5 Sep 2000 19:15:20 -0400; Rich, you are amazing! The series resonance actually makes the input impedance of the tank look like only a few ohms! It actually makes it impossible for the tube to drive significant voltage at the; /archives//html/Amps/2000-09/msg00121.html (10,180 bytes)
14. [AMPS] Blown TL922A... What to do? (score: 1): Author: N6BUU@aol.com (N6BUU@aol.com); Date: Tue, 5 Sep 2000 19:33:17 EDT; << No, I mean cook. The context of my post was "cooking" the tube anodes to de-gas the tubes by running the tubes at 300-400 watts dissipation for several hours. >> ur right, my mistake was not readi; /archives//html/Amps/2000-09/msg00122.html (9,202 bytes)
15. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Tue, 5 Sep 2000 20:08:01 -0700; This is true only when the series resonance is not offset from the parasitic freq. L-networks are never resonant. When the resonance is Near but not dead-on the parasitic freq., the L-network effect; /archives//html/Amps/2000-09/msg00132.html (10,697 bytes)
16. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 5 Sep 2000 23:36:00 -0400; You must be using a new definition of resonance. Can you tell me what you mean? This is a series-resonance, not L-network, and it is shunting the path the tube must drive on VHF. If the tank could f; /archives//html/Amps/2000-09/msg00134.html (10,670 bytes)
17. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Tue, 5 Sep 2000 22:08:32 -0700; zzzzz L-networks transform Z. They shunt not. If the tank were a high-pass Pi, VHF parasitic oscillation would be unlikely. At the HF/MF fundamental freq. there is not enough feedback C to sustain o; /archives//html/Amps/2000-09/msg00137.html (11,389 bytes)
18. [AMPS] Blown TL922A... What to do? (score: 1): Author: ea6nb@wanadoo.es (Jaime P.Ullívarri); Date: Wed, 6 Sep 2000 07:52:52 -0000; Hi Tom, To cook the tubes for de-gassing, normally I left them on stby with a low mains voltage ( maybe 180 to 200v using a variable mains transformer) for several hours. But I think you mean to have; /archives//html/Amps/2000-09/msg00142.html (9,962 bytes)
19. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 6 Sep 2000 07:49:12 -0400; Sounds like you have outgassed. You need to take more nichrome. Nice diversion, but it is not an L network at work. It is a series resonance. So you are saying an amplifying device driving a high lo; /archives//html/Amps/2000-09/msg00144.html (12,032 bytes)
20. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Wed, 6 Sep 2000 09:34:33 -0700; ? The Tune-C series-resonance frequency is Near the oscillation frequency - but not on it. This is what transforms the Tune-C into a Z-stepup L network. ? No. ? I did not propose this. What makes yo; /archives//html/Amps/2000-09/msg00148.html (14,284 bytes)

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