Mail Archive Search: <+from:paulc@mediaone.net>

Results:

References: [ +from:paulc@mediaone.net: 110 ]

Total 110 documents matching your query.

1. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Mon, 3 Dec 2001 19:59:21 -0500; Class of operation is contingent parameter. In Class B or C service for FM broadcast, this tube can typically deliver 2600 watts (See http://www.eimac.com/catalog/168423.htm ). During my college days; /archives//html/Amps/2001-12/msg00051.html (11,801 bytes)
2. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Tue, 4 Dec 2001 10:59:04 -0500; Absolutely. And, there may have been more than one "bad run" on these tubes. I do know that in 1980 it was a critical issue for Eimac. As I indicated in my previous message, I went through ~ 10 new; /archives//html/Amps/2001-12/msg00077.html (8,908 bytes)
3. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Wed, 5 Dec 2001 14:04:41 -0500; If I am not mistaken, the original Alpha 77 (model PA-77) uses such a grid-protection circuit. However, I don't recall how well the switching transistor is buffered and isolated from the grid. If I; /archives//html/Amps/2001-12/msg00118.html (9,277 bytes)
4. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Wed, 5 Dec 2001 16:15:19 -0500; // Some Alphas apparently C-E-short their interrupt transistor. If I am not mistaken, the original Alpha 77 (model PA-77) uses such a grid-protection circuit. However, I don't recall how well the swi; /archives//html/Amps/2001-12/msg00121.html (7,143 bytes)
5. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Wed, 5 Dec 2001 20:40:50 -0500; Regarding the Alpha PA-77... I just reviewed the schematic and here is my understanding of the transistorized grid over-current circuit: The cathode-side of a 8.2 V zener is coupled to the 8877's cat; /archives//html/Amps/2001-12/msg00131.html (11,116 bytes)
6. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Wed, 5 Dec 2001 20:45:46 -0500; Clarification.... "The anode side of the zener is then brought to THE COLLECTOR OF a discrete darlington transistor pair (Q4 & Q5)." -Paul, W9AC -- FAQ on WWW: http://www.contesting.com/FAQ/amps Subm; /archives//html/Amps/2001-12/msg00132.html (8,399 bytes)
7. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Thu, 6 Dec 2001 08:22:35 -0500; That is correct Ian. Right again. In essence, Q2 "samples" the emitter current on the darlington pair. Yes. I failed to mention that the R20 sample point also routes over to the multi-meter circuit; /archives//html/Amps/2001-12/msg00143.html (10,193 bytes)
8. [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Thu, 6 Dec 2001 09:02:18 -0500; By comparison, my PA70-V uses the same darlington EBS circuit to the cathode, but Q2 does not exist as this was a feature "enhancement" in the PA-77 which later replaced the PA70 series. Instead, a 1; /archives//html/Amps/2001-12/msg00144.html (11,871 bytes)
9. e: [AMPS] AL1500 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Fri, 7 Dec 2001 14:13:40 -0500; Quite impressive actually...even without an accelerating circuit. Ian, very interesting results! Another interesting possibility is the use of an opto-isolating photo-transistor (e.g., GE H11A2 or 4; /archives//html/Amps/2001-12/msg00170.html (10,040 bytes)
10. [AMPS] messages (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Wed, 7 Nov 2001 08:30:42 -0500; Yes. Just like this message. You will see two of them from me. Why? Look at the message header. My message and Peter's message are addressed to both the 'AMPS' reflector and to yourself. This commonl; /archives//html/Amps/2001-11/msg00121.html (7,826 bytes)
11. [AMPS] Millen HV Connectors Factory Pricing (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Tue, 20 Nov 2001 13:08:36 -0500; Absolutely stay away from the lesser-rated Millen connectors in any HV application. The first-generation Alpha amplifiers used these connectors between the P.S. compartment and the R.F. deck. Even w; /archives//html/Amps/2001-11/msg00388.html (9,520 bytes)
12. [AMPS] ALPHA 374A (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Fri, 5 Oct 2001 14:43:21 -0400; Looks like the 374 was produced with three 8874s and two with the 374A. See the following link for a complete listing of legacy Alpha Amplifier specs... http://www.alpha-amps.com/html/legacy.htm For; /archives//html/Amps/2001-10/msg00093.html (14,670 bytes)
13. [AMPS] Re: [ETO_Alpha] B&W 802 plate choke in an Alpha 77Dx (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Wed, 10 Oct 2001 18:22:05 -0400; Yes. In fact, the added inductance will in the #802 will allow for 24 MHz operation with the 77DX/77Dx/77/PA70-V. Dick Byrd, N4UQ, offers an exchange program where he sends you an #802 equivalent re; /archives//html/Amps/2001-10/msg00273.html (7,621 bytes)
14. [AMPS] IMD (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Tue, 18 Sep 2001 16:37:39 -0400; So true Jon. Ten years ago, I left design work for a management position which paid substantially more than I had been making in design. However, there's no financially-safe haven in management eith; /archives//html/Amps/2001-09/msg00333.html (11,275 bytes)
15. [AMPS] TS-2000 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Fri, 3 Aug 2001 13:28:02 -0400; W8JI: I suppose it depends on your definition of the perfect wave shape. If what you see is the same as my reference on p 15.6 of the 1998 ARRL Handbook, I would gladly trade my eye teeth for the wav; /archives//html/Amps/2001-08/msg00033.html (11,998 bytes)
16. [AMPS] TS-2000 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Fri, 3 Aug 2001 17:14:58 -0400; I would agree with that and to simultaneously meet these two requirements, the sine rise - sine decay in ~ 2 mS time on each slope is probably a good starting point. The waveform that I referred to; /archives//html/Amps/2001-08/msg00036.html (13,093 bytes)
17. [AMPS] TS-2000 (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Fri, 3 Aug 2001 21:35:53 -0400; The sound...not the wave shape. The exponential decay produces this effect and agreeably at the cost of added bandwidth. I use 1.8 kHz and 2.4 kHz filters most of the time and let my ear filter out; /archives//html/Amps/2001-08/msg00043.html (10,397 bytes)
18. [AMPS] Watercooling Question (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Tue, 7 Aug 2001 10:26:03 -0400; This is a multi-part message in MIME format. --=_NextPart_000_0098_01C11F2B.5C6A2700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The following Eimac app; /archives//html/Amps/2001-08/msg00079.html (11,741 bytes)
19. [AMPS] Tetrode poor IMD performance (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Wed, 15 Aug 2001 18:23:13 -0400; Not very linear, is it? Is this indicative of most tetrode-based designs? I had always thought that in addition to higher gain, tetrodes offered better IMD performance over GG triodes, all other fact; /archives//html/Amps/2001-08/msg00142.html (9,318 bytes)
20. [AMPS] RJ-iAvacuum relay (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Tue, 21 Aug 2001 08:23:46 -0400; I had a similar experience with RF Parts several years ago. I had ordered either a Jennings RJ-1A or Kilovac HC-1 and upon receipt, I noted that it was surplus and looked like it had been in a very c; /archives//html/Amps/2001-08/msg00256.html (9,346 bytes)

Current List: 1 - 20
Page: [1] [2] [3] [4] [5] [6]