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41. [AMPS] Re: series filaments (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 18 Nov 1997 14:42:40 -0000; Tom, you say: Hmmm????? It affects the current, but unless you're pulling so much current that you're stripping out the space charge, does it affect emission? I think you're meaning 'emission' as 'cu; /archives//html/Amps/1997-11/msg00244.html (7,140 bytes)
42. No subject (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 19 Nov 1997 10:59:27 -0000; 400W There are those who argue that if you can power the amp from a UK standard 230 volt 13 Amp outlet ( which may well be able to give up to 20Amps for short periods), it's legal! 73 Peter G3RZP --; /archives//html/Amps/1997-11/msg00264.html (7,028 bytes)
43. [AMPS] Re:solid state relay (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 20 Nov 1997 12:20:03 -0000; I've used one once in a HV supply, with a snubber (series R -C) across it. It failed - short circuit. Possibly a mains spike. I prefer big, heavy duty DC relays - no 50Hz buzz - and have had greater; /archives//html/Amps/1997-11/msg00280.html (7,121 bytes)
44. [AMPS] series filaments (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 20 Nov 1997 12:40:51 -0000; OK, agreed. I have seen it claimed that 6A3s were worse on hum than 2A3s in audio amplifiers for exactly the same reason. Which is why it's better to ground the centre tap rather than one side of the; /archives//html/Amps/1997-11/msg00284.html (8,475 bytes)
45. [AMPS] Re:solid state relays (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 20 Nov 1997 14:19:33 -0000; I hadn't realised quite what Dave meant by until I read Tom's comment. I agree 100% with Tom on this. (I know, makes a change for me to 100% agree with anyone). I guess the best would be the old fash; /archives//html/Amps/1997-11/msg00290.html (7,926 bytes)
46. [AMPS] RE:Loading problem (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 21 Nov 1997 14:14:33 -0000; Rich's suggestion is a good start. A sort of related question: has anyone any experience with drift in compression type mica trimmers used as padders in high current circuits? 73 Peter G3RZP -- FAQ o; /archives//html/Amps/1997-11/msg00306.html (6,869 bytes)
47. [AMPS] volts (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 6 Oct 1997 12:53:20 +0100; idiot It is claimed in many places that the most dangerous voltages are between 400 and 1600 DC, as that usually leads to ventricular fibrillation. Some people claimed that sweep tube linears were sa; /archives//html/Amps/1997-10/msg00029.html (7,644 bytes)
48. [AMPS] volts (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 6 Oct 1997 17:29:07 +0100; Adding to George's (K6GT) comments, don't assume that because a solid state amp is running 12, 28 or 50 volts, it's safer. I'd suggest, in addition to George's recommendations, the following:- 1. DON; /archives//html/Amps/1997-10/msg00032.html (7,759 bytes)
49. [AMPS] B+resistors (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 9 Oct 1997 17:18:13 +0100; Rich, Have you any comments about using big solid carbon or metal film resistors - things like 50ohm, 50 watt metal film tubular resistors NOT spirally cut, as are/were made for dummy loads? Similarl; /archives//html/Amps/1997-10/msg00053.html (7,917 bytes)
50. [AMPS] electrolytics (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 13 Oct 1997 09:33:43 +0100; that >when you need to peer inside the chassis, the bakelite bottom with its >bleeder hole does not peer back at YOU. Amen to that. I knew a guy at Marconi's who lost an eye when an electrolytic went; /archives//html/Amps/1997-10/msg00075.html (7,104 bytes)
51. [AMPS] 572 parasitic suppressors (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 13 Oct 1997 16:40:31 +0100; Carl, Would you mind sharing that design with us? My experience of 572B's is that they are something akin to swine to sort out the parasitics on. The KW1000 (a UK made linear in the same size box as; /archives//html/Amps/1997-10/msg00080.html (7,289 bytes)
52. [AMPS] Bird Thruline Line Section Question (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 16 Oct 1997 11:16:28 +0100; Phil, Bird Electronic Corp is 30303 Aurora Road, Cleveland OH 44139. Tel is216 248 1200, FAX is 216 248 5426. The Bird Technologies Group of Bird Electronic Corp is listed with same street address, s; /archives//html/Amps/1997-10/msg00094.html (8,792 bytes)
53. [AMPS] Bird meters (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 16 Oct 1997 16:35:38 +0100; rack of Carl, Are you thinking of something that ends up with the same meter scale as the Bird, or do you want something that will give a linear power scale, thus needing a non linear amplifier? 73 P; /archives//html/Amps/1997-10/msg00098.html (7,093 bytes)
54. [AMPS] arcs (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 17 Oct 1997 14:33:51 +0100; Am I interpreting you correctly that you are saying internal arcs CAN occur, but rarely cause the major damage levels seen, such as bent filaments etc, when the tube is not gassy? 73 Peter G3RZP -- F; /archives//html/Amps/1997-10/msg00109.html (7,225 bytes)
55. [AMPS] arcs (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 17 Oct 1997 16:17:11 +0100; Rich, you say: arc. I don't know what the 8877 grid looks like after it has had the gold boiled. But I would surmise that IF it was boiled by an arc, there would be one spot on the grid totally boile; /archives//html/Amps/1997-10/msg00111.html (7,397 bytes)
56. [AMPS] Perfect Amplifier (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 1 Sep 1997 12:06:29 +0100; Rich raises some interesting points. I guess one question to ask is: "Are we designing a commercially viable, going to make lots of, device OR are we building one offs as amateurs?" The answer to thi; /archives//html/Amps/1997-09/msg00004.html (11,982 bytes)
57. [AMPS] perfect amplifiers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 2 Sep 1997 09:50:53 +0100; in many >cases. want to want in amps 10-20 bare educated >about this. I guess this should apply to newcomers in the professional design area as well, Phil. I must admit I only use 3/16 tubing, though; /archives//html/Amps/1997-09/msg00026.html (12,521 bytes)
58. [AMPS] RE:perfect amplifiers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 2 Sep 1997 16:38:08 +0100; Being cynical (who, me?) I wonder if we ought to worry too much about very clean linears at HF (i.e. better than say -36dB rel. one tone of a two tone signal), since we seem to be likely to drive the; /archives//html/Amps/1997-09/msg00029.html (6,896 bytes)
59. [AMPS] conjugate match (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 3 Sep 1997 08:59:11 +0100; Tom, I'm in deep disagreement with you on conjugate matching. Not that it matters - it should lead to a lively discussion! But, when you say: is often confused with a dissipative resistance like a re; /archives//html/Amps/1997-09/msg00036.html (8,177 bytes)
60. [AMPS] silver plate (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 3 Sep 1997 09:39:49 +0100; That's my understanding. But apparently, not all silver platings are the same - there's a 'hard' and a 'soft' plate, and one of them (and I can't remember which) can actually reduce Q. 73 Peter G3RZ; /archives//html/Amps/1997-09/msg00038.html (7,408 bytes)

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