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1. [AMPS] Need Alpha 374A Mods. (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Sat, 1 May 1999 17:18:48 -0600; Bill, ALPHA/POWER, Inc. has a page on its web site <www.alpha-power-inc.com> listing all the legacy ALPHA amps from 70V (1970) through at least the 76A-78 series (1978-85), tube complements, band cov; /archives//html/Amps/1999-05/msg00006.html (8,210 bytes)
2. FW: [AMPS] 8877s and MRIs? (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Mon, 10 May 1999 12:33:48 -0600; Barry... ETO 16 kW (peak) amps used in virtually all GE, Picker, Philips & Toshiba 1.5 Tesla MRI systems from 1984-89 were servo-tuned and bandswitched with digital stepping motors. They used a pair; /archives//html/Amps/1999-05/msg00127.html (9,560 bytes)
3. [AMPS] Vacuum relay help (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Tue, 11 May 1999 15:04:21 -0600; Don... You probably can buy coils directly from Kilovac (Santa Barbara, CA?), or it's possible that Alpha/Power @ (970) 535-4173 or <apicontact@aol.com> may carry spares. Good luck. Dick Does anyone; /archives//html/Amps/1999-05/msg00141.html (7,831 bytes)
4. [AMPS] Henry 2K2; glitch resistor in negative HV considerations (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Wed, 12 May 1999 08:45:37 -0600; Rich, Ian & all... Am I missing something? There's no reason for the cathode and bias circuit to go way negative when the "glitch resistor" is in the negative HV lead and a +HV arc occurs. Putting th; /archives//html/Amps/1999-05/msg00145.html (10,622 bytes)
5. [AMPS] Henry 2K2; glitch resistor in negative HV considerations (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Wed, 12 May 1999 12:22:07 -0600; Rich et al... 1. I doubt that the manufacturers' recommendations are meant to dissuade users from negative-lead resisting - more likely that the + line is more "obvious" and they didn't give it a tho; /archives//html/Amps/1999-05/msg00153.html (9,067 bytes)
6. [AMPS] Henry 2K2; glitch resistor in negative HV considerations (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Mon, 17 May 1999 13:35:48 -0600; No argument, Norm, although if I remember right the '5404 is rated for 400A surge for a longer time than a typical HV filter cap takes to discharge through a 20-50 ohm suppression resistor (~100A pea; /archives//html/Amps/1999-05/msg00193.html (9,977 bytes)
7. [AMPS] Big Bang Theories? (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Mon, 17 May 1999 13:52:54 -0600; I'll toss in an opinion the the question below: Big BANG means an air-borne arc(vs. inside the tube vacuum) OR an exploding component - such as the plate choke exploding when a tube arcs in an amp wi; /archives//html/Amps/1999-05/msg00194.html (12,470 bytes)
8. [AMPS] HV PS topics (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Mon, 17 May 1999 13:31:04 -0600; Hi John... Your comment (below) about the BE transmitter power supply choke application reminded me of perhaps the best underlying reason for putting filter choke(s) in the HV lead: insulation breakd; /archives//html/Amps/1999-05/msg00195.html (14,382 bytes)
9. [AMPS] Arcing in air vs. arcing in a vacuum (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Mon, 17 May 1999 14:38:59 -0600; Hi Jon... Sorry you caught me w/my head under the table Saturday and were gone by the time I stood up & figured out who'd said "Hi." If your friend's theory was correct, vacuum capacitors surely woul; /archives//html/Amps/1999-05/msg00198.html (10,994 bytes)
10. [AMPS] Big Bang Theories? (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Mon, 17 May 1999 14:39:08 -0600; Pardon, Jon, but sound waves don't propagate in the absence of some medium, such as air or water. A big "bang" in a vacuum is essentially inaudible; however the multi-hundred-amp current surge, or th; /archives//html/Amps/1999-05/msg00199.html (11,372 bytes)
11. [AMPS] Brightest Bottles (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Wed, 19 May 1999 09:51:29 -0600; Hi Ed... Maybe something like the old (WWII-era) 250TH/TL, 450TH/TL, or 304TL. They would run literally white hot without fatal damage on occasion. Remember seeing white lines on the high ceiling of; /archives//html/Amps/1999-05/msg00228.html (8,864 bytes)
12. [AMPS] FCC Actions at Dayton (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Fri, 21 May 1999 11:33:22 -0600; Alek & guys.... Sorry, Alek, but in my opinion your last comment is way off the reservation. Venturing dangerously close to the precipice of politics, the fact that a whole series of U.S. congresses; /archives//html/Amps/1999-05/msg00266.html (13,796 bytes)
13. [AMPS] parasite (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Fri, 9 Apr 1999 15:34:18 -0600; Hi John... I refuse to be drawn into a discussion of what I was doing socially in 1947. Just figured it would have taken you at least 50 years to get so much QRO experience! (Not kidding - but that's; /archives//html/Amps/1999-04/msg00199.html (12,102 bytes)
14. [AMPS] Parasitic suppressors/another question, (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Fri, 9 Apr 1999 15:51:48 -0600; ? Adjusting C-tune makes little difference in the anode resonance since C-tune is effectively in series with C-anode, which is much smaller. [Richard W. Ehrhorn] <<< A sweeping generalization which i; /archives//html/Amps/1999-04/msg00200.html (11,107 bytes)
15. [AMPS] Parasitic suppressors/another question, (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Sat, 10 Apr 1999 07:42:49 -0600; probably be around 100pF. However, in a SB-220 the measured anode resonant freq. changes little between 80m and 10m operation. But one example does not a universe make. 73, Dick Rich... R. L. Measure; /archives//html/Amps/1999-04/msg00230.html (10,842 bytes)
16. [AMPS] 87A Fault 17; cause & cure (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Sun, 11 Apr 1999 23:18:41 -0600; Hi Dick & all... Dick, I believe your timing explanation as to why you see Fault 17 (low gain)rather than Fault 13 (overdrive) is precisely correct. I remember discussing the exact same issue with th; /archives//html/Amps/1999-04/msg00248.html (15,871 bytes)
17. [AMPS] RE: L band oscillation inside tube; "the old days" (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Tue, 13 Apr 1999 10:14:29 -0600; Morning, John... You're taking me WAY back... The two aromas I recall best are rf-burnt flesh and melting polyethylene (as in 300 ohm twinlead) and folded dipoles. My favorite images: purplish glow f; /archives//html/Amps/1999-04/msg00276.html (12,788 bytes)
18. FW: [AMPS] Alpha/Power and Henry Radio (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Tue, 13 Apr 1999 10:20:43 -0600; Hi Richard... I have personally done the same demonstration with virtually every ALPHA model we've ever built - beginning with the original ALPHA SEVENTY back at the Miami, Orlando and Jacksonville h; /archives//html/Amps/1999-04/msg00277.html (8,699 bytes)
19. [AMPS] ICE bandpass filter problems (score: 1): Author: w4eto@rainbow.rmii.com (Richard W. Ehrhorn); Date: Wed, 28 Apr 1999 13:52:48 -0600; Several years ago I bought several ICE units intended to protect radios from electrostatic discharges & presumable lightning-induced spikes. They smoked in short order at less than rated carrier powe; /archives//html/Amps/1999-04/msg00421.html (7,031 bytes)

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