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1. [Amps] Neutral vs Ground Connection for 220 VAC (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Thu, 12 Dec 2002 09:14:36 -0500; Mike, An excellent question and its one I wrestled with painfully when connecting my Alpha 77Dx to service in my new home.... Most amateur amplifiers do not require a neutral when configured for 240V; /archives//html/Amps/2002-12/msg00172.html (11,370 bytes)
2. [Amps] Failed 8877 (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Sun, 6 Oct 2002 14:47:00 -0400; After 20 years of service, I experienced my first problem with my Alpha 77Dx amplifier. I noted that the input VSWR into the amp was very high, zero plate current, and only 40mA of grid current regar; /archives//html/Amps/2002-10/msg00046.html (7,962 bytes)
3. [Amps] 8877 - To Choke or not to Choke? (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Mon, 7 Oct 2002 21:49:33 -0400; As I've been sorting through my 8877 filamant issue, I have noted that some GG 8877 designs tie the filamant and cathode together while other designs do not. The designs that keep the cathode isolate; /archives//html/Amps/2002-10/msg00064.html (7,998 bytes)
4. [Amps] Alpha 87A amp (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Wed, 16 Oct 2002 11:14:15 -0400; Of course, Alpha's main competitor in this performance and price class is the ACOM 2000A. I have owned two ACOMs and two 87As. I now run only the older battleship Alphas. Anyway... Both the 87A and A; /archives//html/Amps/2002-10/msg00173.html (11,305 bytes)
5. [Amps] pictures (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Thu, 22 Aug 2002 09:31:06 -0400; And don't fall into the trap of purchasing for "more megapixels" alone. Resolution quality for both distant and near-field objects is also largely dependant on the lens quality. From the barrage of a; /archives//html/Amps/2002-08/msg00198.html (10,037 bytes)
6. [Amps] bangs in 3cx800 (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Sat, 24 Aug 2002 15:24:38 -0400; make Except perhaps on the air? Rated third-order IMD of the ACOM 1000 is only -35 dB below rated output. I suspect real-world performance from this tetrode-based amp without a tuned input may be wo; /archives//html/Amps/2002-08/msg00250.html (7,463 bytes)
7. [Amps] bangs in 3cx800 (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Sat, 24 Aug 2002 17:17:48 -0400; a Recall that the 2000A is a true auto-tune amp and it performs this function remarkably well...even better than the Alpha 87A in my opinion. If the amp is misadjusted during tune-up, it's the amp's; /archives//html/Amps/2002-08/msg00253.html (8,374 bytes)
8. [Amps] ETO Model 70 Amplifier (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Mon, 1 Jul 2002 15:38:11 -0400; Two versions of the original ALPHA SEVENTY were offered. The 70V is the vapor-cooled version which uses the 3CV1500A7 and the 70A was the air-cooled version, using a 3CX1000A7. Both amps offer instan; /archives//html/Amps/2002-07/msg00009.html (8,907 bytes)
9. [Amps] ETO Model 70 Amplifier (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Mon, 1 Jul 2002 15:49:09 -0400; Actually, the only part not still available and in production on the 70V is the power tube (although not a trivial matter!). However, if you are fortunate to find a 70V with a good tube and a good s; /archives//html/Amps/2002-07/msg00014.html (8,067 bytes)
10. [Amps] ETO Model 70 Amplifier (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Mon, 1 Jul 2002 16:41:38 -0400; Right. There is indeed a baffle contained within the tube's boiler assembly; the purpose of which is to better regulate the exhaustion of steam from the tube and to assist in minimizing boiled hot s; /archives//html/Amps/2002-07/msg00018.html (8,072 bytes)
11. [Amps] Re: Big HV Transformer for Sale (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Thu, 20 Jun 2002 11:31:45 -0400; One form of phase-modulated AM is termed "Ampliphase," a technique used by RCA in it's high-power MW and SW broadcast transmitters from the late '50s through the mid '70s. Here's an interesting arti; /archives//html/Amps/2002-06/msg00153.html (8,818 bytes)
12. [Amps] re: CTI screen regulator, tubes vs solid state (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Sat, 22 Jun 2002 11:10:05 -0400; Is this amp now FCC Type Accepted? The overall "classic" concept of this amp is interesting, but I'm having a hard time taking any amp seriously which uses 4CX250Bs. -Paul, W9AC; /archives//html/Amps/2002-06/msg00187.html (8,409 bytes)
13. [Amps] Earliest Commercial Amateur Linear Amplifier (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Wed, 26 Jun 2002 14:19:54 -0400; If we look back to the period between 1900 and 1930, commercially manufactured "amateur" transmitters did not exist. In the era between 1919 and 1921, we find that CW begins replacing homebrew spark; /archives//html/Amps/2002-06/msg00236.html (8,931 bytes)
14. [Amps] My work is famous! (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Mon, 13 May 2002 14:52:34 -0400; Looks like some great design work Jon. How about a quick history lesson on the product? -Paul, W9AC; /archives//html/Amps/2002-05/msg00176.html (7,408 bytes)
15. [Amps] 1.5 Kw SS HF amp reasonably priced...when? (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Sat, 20 Apr 2002 19:06:22 -0400; I purchased and installed the Harris DX-50 50KW transmitter for the legendary WAPE - 690 kHz in Jacksonville back in 1995. It was without a doubt one of my better decisions when I was in the broadca; /archives//html/Amps/2002-04/msg00504.html (7,934 bytes)
16. [Amps] Winding Toroid Help (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Mon, 4 Mar 2002 09:22:31 -0500; FWIW - I generally make my own Teflon-jacketed wiring.... First start with ordering Teflon tubing and bare buss-bar wire. Alpha Wire and Belden sells Teflon tubing and bare buss-bar wire in rolls of; /archives//html/Amps/2002-03/msg00045.html (7,882 bytes)
17. [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Tue, 26 Mar 2002 19:23:24 -0500; Unless the source generator is a pure resistance, where all reflections at the load are returned to, and absorbed by the source. -Paul, W9AC; /archives//html/Amps/2002-03/msg00607.html (8,320 bytes)
18. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Tue, 26 Mar 2002 20:52:02 -0500; the Correct. In the case of a 50-ohm resistive source (e.g., a solid-state transmitter without a pi-network, ATU, or other reactance network), reflected power created by a line-to-load mis-match is; /archives//html/Amps/2002-03/msg00614.html (10,121 bytes)
19. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Wed, 27 Mar 2002 09:06:35 -0500; should I ran some tests this morning using my Ten-Tec Omni Six and Kenwood TS-850/SAT with auto-tuner. I used my Bird 43 wattmeter as the measuring device at the source end into 100-feet of LMR-400; /archives//html/Amps/2002-03/msg00624.html (14,373 bytes)
20. [Amps] Re: [Amps] Re: [Amps] Bird® 43 Manual (score: 1): Author: w9ac@arrl.net (Paul Christensen); Date: Wed, 27 Mar 2002 10:50:24 -0500; Quid Pro Quo: That's my assertion, what is yours? Where do you believe 100-watts of source power is being dissipated in an unterminated line? Even if the transceiver's maximum output power was not a; /archives//html/Amps/2002-03/msg00629.html (10,646 bytes)

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