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81. [AMPS] Blown TL922A... What to do? (score: 1): Author: watson@epiloglaser.com (George K. Watson); Date: Thu, 7 Sep 2000 20:35:29 -0600; What to do? 1. Delete all of the messages pertaining to this topic. 2. If you have one of these amps, either throw the thing away or ship it to one of the protagonists in this drivel fest, as they se; /archives//html/Amps/2000-09/msg00256.html (9,520 bytes)
82. [AMPS] Blown TL922A... What to do? (score: 1): Author: RMcGraw@InfoAve.Net (Bob & Linda McGraw K4TAX); Date: Thu, 07 Sep 2000 22:09:36 -0700; AMEN! 73 Bob K4TAX -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com; /archives//html/Amps/2000-09/msg00259.html (10,041 bytes)
83. [AMPS] Blown TL922A... What to do? (score: 1): Author: ve3tu@rac.ca (Steve); Date: Fri, 08 Sep 2000 01:34:11 -0400; I have to agree with George, this great debate does not seem to me to be advancing the state of the art. I can just picture it, a group standing by a tomb stone which reads "WATCH OUT FOR THE PARASIT; /archives//html/Amps/2000-09/msg00269.html (10,946 bytes)
84. [AMPS] Blown TL922A... What to do? (score: 1): Author: rfamps@ic24.net (Steve Thompson); Date: Fri, 8 Sep 2000 08:25:22 +0100; the Has anyone been able to measure the frequency of oscillation in, for example, TL922? What dip frequencies are found with a GDO in a 922? In other amps? I don't. I've never mastered a straight key; /archives//html/Amps/2000-09/msg00272.html (12,750 bytes)
85. [AMPS] Blown TL922A... What to do? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 8 Sep 2000 08:27:08 +0100; I'll ask again: What is the standard TL922 parasitic suppressor? If it's the usual carbon resistor/shunt inductor, I could well imagine parasitics starting after a period, as the resistor has probabl; /archives//html/Amps/2000-09/msg00273.html (9,929 bytes)
86. [AMPS] Blown TL922A... What to do? (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Fri, 08 Sep 2000 06:53:30 -0400; Thank you, Peter! At last the discussion moves forward. Given how long any given TL-922 may have been around, it seems entirely plausible to me that the suppressor resistors would have changed value; /archives//html/Amps/2000-09/msg00274.html (10,364 bytes)
87. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 8 Sep 2000 08:33:48 -0400; I'm missing something in the above Steve. Tell me how a GDO can be used to measure the mode of resonance? How do you know the impedance is high, instead of low? How do you know what you are measurin; /archives//html/Amps/2000-09/msg00275.html (12,689 bytes)
88. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Fri, 8 Sep 2000 05:47:40 -0700; I doubt that Tom has any such evidence. I tested the 922 cooling system and found it to be surprizingly efficient. Anyone who looks over the tubes in a TL-922 knows that the Eimac ink is red. Arcs d; /archives//html/Amps/2000-09/msg00276.html (10,961 bytes)
89. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Fri, 8 Sep 2000 05:47:43 -0700; To: <amps@contesting.com> The only case I have knowledge of involved loosely coupling a spectrum analyzer to the anodes of a seemingly stable* SB-220. Whenever anode-current changed, damped wave rin; /archives//html/Amps/2000-09/msg00278.html (12,949 bytes)
90. [AMPS] Blown TL922A... What to do? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 8 Sep 2000 13:52:09 +0100; With respect, Tom, I think you're falling into the same trap Rich does - generalising from insufficient evidence. Consider the case where there is a resonance of the the tube output capacity in serie; /archives//html/Amps/2000-09/msg00280.html (11,036 bytes)
91. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Fri, 8 Sep 2000 06:31:33 -0700; A test by the owner of a SB-220 indicated that the max. mistune potential for the tank was 3700v. My own tests semi-confirm this. zzzzzz If an antenna tuner cap. or a lightning-arrestor gap arcs, it; /archives//html/Amps/2000-09/msg00281.html (14,101 bytes)
92. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Fri, 8 Sep 2000 06:47:56 -0700; less There is undoubtedly no way to build a VHF suppressor that does not have considerable loss at 29MHz. The hat trick is finding a resistor with c. 10nH that can dissipate what's needed. cheers, P; /archives//html/Amps/2000-09/msg00282.html (11,376 bytes)
93. [AMPS] Blown TL922A... What to do? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 8 Sep 2000 15:05:54 +0100; Another sweeping generalisation! Because a tube with the plate parasitic resonance BELOW the grid parasitic resonance doesn't oscillate, a plain inductor can clear it up. If I remember correctly, was; /archives//html/Amps/2000-09/msg00283.html (9,659 bytes)
94. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 8 Sep 2000 10:23:05 -0400; There certainly is a way. The "theory" that the suppressor has to get hot at 29 MHz to have considerable ESR at 100MHz is not correct. I'll wager money I can build a suppressor that has almost no 29; /archives//html/Amps/2000-09/msg00284.html (9,812 bytes)
95. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 8 Sep 2000 10:23:05 -0400; It's limited by what breaks down, and the loaded Q of the tank. I can easily get ten times that amount using HV rated parts in a PA. I've measured higher voltages in the 220, although even 3700 volt; /archives//html/Amps/2000-09/msg00285.html (9,795 bytes)
96. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 8 Sep 2000 10:23:05 -0400; With respect Peter, you seem to have not read my post. I have measured the tanks in several PA's that Rich claims have arcing failures from VHF parasitics. These amplifiers have large air variables t; /archives//html/Amps/2000-09/msg00286.html (12,911 bytes)
97. [AMPS] Blown TL922A... What to do? (score: 1): Author: 2@vc.net (measures); Date: Fri, 8 Sep 2000 07:42:33 -0700; hardly. Successful suppressors typically exhibit hellish heat on 10m RTTY or FM. semi-true. One problem is that the anode-resonance does not stay put from band to band. (groan) don't Indeed. The kap; /archives//html/Amps/2000-09/msg00287.html (10,091 bytes)
98. [AMPS] Blown TL922A... What to do? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 8 Sep 2000 15:43:44 +0100; That doesn't mean it can't happen - only that you haven't seen it. Getting a sufficiently high impedance of R very high in series with absolutely j0. Assume the stray capacity to ground from the swit; /archives//html/Amps/2000-09/msg00288.html (10,670 bytes)
99. [AMPS] Blown TL922A... What to do? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 8 Sep 2000 15:46:17 +0100; resonance doesn't oscillate, No, Rich, totally true. While that condition is valid, it doesn't and can't oscillate. This is 1920's technology - see Mr. Miller (his name, not his occupation). 73 Peter; /archives//html/Amps/2000-09/msg00289.html (9,264 bytes)
100. [AMPS] Blown TL922A... What to do? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 8 Sep 2000 11:08:36 -0400; To be more specific: It means I have not seen it in PA's where Rich claims the bandswitch is damaged by VHF oscillations. The R only has to be a value somewhat higher than the dynamic impedance of t; /archives//html/Amps/2000-09/msg00290.html (11,878 bytes)

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