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References: [ +from:Peter_Chadwick@mitel.com: 967 ]

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241. [AMPS] Blown TL922A... What to do? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 12 Sep 2000 07:00:48 +0100; Then it doesn't meet the criteria for stability - viz, anode parasitic resonance lower than grid parasitic resonance. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amp; /archives//html/Amps/2000-09/msg00513.html (9,243 bytes)
242. [AMPS] Logic v. Magic (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 12 Sep 2000 07:05:27 +0100; This is very true. A very similar effect is not uncommon when repairing PC boards - a component is replaced and the board works, while the original component tests (and is) good. The problem has been; /archives//html/Amps/2000-09/msg00514.html (8,441 bytes)
243. [AMPS] SELL:8877 RF Deck Components (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 12 Sep 2000 07:55:40 +0100; Sure - but working grey matter between the ears of the operator (provided it gets used) can add at least 6dB. It doesn't matter how big your signal is if you transmit when he does.......... 73 Peter; /archives//html/Amps/2000-09/msg00518.html (7,434 bytes)
244. [AMPS] Blown TL922A... What to do? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 12 Sep 2000 08:49:17 +0100; . The question is how long this will take - especially 1. Modelling is a very good tool - if the model is right. 'Ay, there's the rub'. At an international standards meeting, one American guy made a; /archives//html/Amps/2000-09/msg00519.html (9,912 bytes)
245. [AMPS] Properties of Different Metals (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 12 Sep 2000 10:19:31 +0100; high Skin depth is given by the eqn: d = (2.6/sq.rt. f)K K is one for copper, f is in MHz, and the depth is in thousandths of an inch ('mil') K is given by sq. rt.[(1/u) p/pc] u is the relative perme; /archives//html/Amps/2000-09/msg00521.html (9,494 bytes)
246. [AMPS] Properties of Different Metals (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 12 Sep 2000 11:01:03 +0100; Do you think we can start an 'intermodulation is caused by using electrolytics in linear amplifier power supplies' story? Let your imagination have free rein...... 73 Peter G3RZP -- FAQ on WWW: http:; /archives//html/Amps/2000-09/msg00523.html (7,878 bytes)
247. [AMPS] Logic v. Magic (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 12 Sep 2000 11:22:29 +0100; So where's the difference between them and nichrome inductor, except that the resistance is higher? Let's not lose sight of the fact a nichrome inductor will have a Q that increases with frequency -; /archives//html/Amps/2000-09/msg00524.html (8,280 bytes)
248. [AMPS] Mount pi-net capacitors vertically (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 18 Sep 2000 10:38:57 +0100; After getting the comments from Rich about this, I've gone over to vertical mounting, and found (fortuitously?) that I end up with far more sanitary layouts and easier mechanics. However, I am motor; /archives//html/Amps/2000-09/msg00838.html (9,044 bytes)
249. [AMPS] Mount pi-net capacitors vertically (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 18 Sep 2000 13:50:27 +0100; As they say, there's more ways than one of skinning a cat.....I think that especially if motor driving, vertical mount can (not necessarily has) have advantages. 73 Peter G3RZP -- FAQ on WWW: http://; /archives//html/Amps/2000-09/msg00840.html (8,193 bytes)
250. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 19 Sep 2000 09:32:00 +0100; This is not necessarily so. Class AB2 or Class B2 operation with grid current in grounded cathode requies a well regulated bias supply, and a well regulated drive, but it does NOT automatically mean; /archives//html/Amps/2000-09/msg00855.html (9,251 bytes)
251. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 19 Sep 2000 09:59:08 +0100; Which is why 572s are such a problem. One of the applications for the 833 was in RF heating, usually as a power oscillator at 27MHz. Regardless of that, I suspect that parasitic suppression when oper; /archives//html/Amps/2000-09/msg00857.html (8,949 bytes)
252. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 19 Sep 2000 10:13:18 +0100; This is all very true. However, there is an anomaly in the argument in that in GG AB2, the grid does go positive with respect to the cathode. The reliance is on negative feedback to keep distortion d; /archives//html/Amps/2000-09/msg00859.html (9,624 bytes)
253. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 19 Sep 2000 15:24:03 +0100; Tom, Haven't you learned that the ONLY way that it is possible to run a linear PA is in GG zero bias? For that, you have to have a high mu tube! In grounded cathode of course, gain is [mu. Rl]/[Rl +; /archives//html/Amps/2000-09/msg00866.html (8,943 bytes)
254. [AMPS] BC610... no 833's (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 19 Sep 2000 16:48:42 +0100; I'm sure George is correct on that. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: ow; /archives//html/Amps/2000-09/msg00876.html (8,381 bytes)
255. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 19 Sep 2000 17:03:43 +0100; Something I don't understand here. How come grid driven high mu triodes can produce lots of low distorted power in audio service? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Subm; /archives//html/Amps/2000-09/msg00879.html (8,785 bytes)
256. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 25 Sep 2000 11:52:52 +0100; Just funny that the broadcasters managed OK using audio amps with grid current. And don't let us forget the people like Collins, Marconi, Racal, Brown-Boveri and so on who very successfully used line; /archives//html/Amps/2000-09/msg00975.html (9,227 bytes)
257. [AMPS] New member and Drake L7 questions (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 25 Sep 2000 13:00:30 +0100; Unless the meters are 500mV drop (rather than the usual 100mV), I'd argue that there's no 'probably' involved - it is a VERY good idea - in any amplifier. 73 Peter G3RZP -- FAQ on WWW: http://www.con; /archives//html/Amps/2000-09/msg00977.html (8,222 bytes)
258. [AMPS] Amp using 833A (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 25 Sep 2000 13:30:44 +0100; Your statements have always been that Class AB2 grounded cathode produced unacceptable distortion, with the implication that no circuit techniques exist to prevent it. Pappenfus et al describe where; /archives//html/Amps/2000-09/msg00980.html (9,374 bytes)
259. [AMPS] wanted SB 220 bandswitch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 25 Sep 2000 13:49:45 +0100; This would appear to be a fairly common problem. Is the switch in the standard SB220 switch so easy to turn that it's not noticeable that it's not a capacitor? If so, some sort of stronger spring in; /archives//html/Amps/2000-09/msg00981.html (8,005 bytes)
260. [AMPS] New member and Drake L7 questions (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 25 Sep 2000 15:21:30 +0100; A lot depends on what the meters are. If the shunt is internal and it's a 'standard' 100mV meter, then increasing the drop isn't very practical. A 5x overload may not be a brilliant idea for the mete; /archives//html/Amps/2000-09/msg00985.html (8,580 bytes)

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