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1. [AMPS] re: beryllium in tubes (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Mon, 5 Oct 1998 15:53:50 EDT; << Some years ago I read, in QST I think, that the incidence of leucaemia in USA hams is about twice that of the population's norm. Exposure to "intense x-rays" from tubes at high output, fields arou; /archives//html/Amps/1998-10/msg00022.html (8,179 bytes)
2. [AMPS] Re: SB220 prices (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Wed, 1 Jul 1998 02:13:19 EDT; << Hi Chris, Im curious what a SB220 w/ tubes goes for in your part of the world. Here in the Dallas area one with good tubes and no mods other than the low current keying mod will go for $550 if it; /archives//html/Amps/1998-07/msg00003.html (6,657 bytes)
3. [AMPS] RE: Henry 8K ultra or Commander HF-2500E (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Mon, 1 Jun 1998 13:19:13 EDT; << Chris, The 3cx3000 is very hard for the average ham to work with. First, it takes 7.5 vac @55 Amps for the filaments. It does not work well with less than 5kv on the plate and at that Ep it idles; /archives//html/Amps/1998-06/msg00009.html (8,254 bytes)
4. [AMPS] RE: Counterpoints and corrections to Radiodan (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Sun, 7 Jun 1998 09:49:00 EDT; << I've only seen "SPIN" this good from President Clinton! Good. All we need is a Clinton basher on the remailer. Do you think it would be at all possible to keep political preferences out of a discu; /archives//html/Amps/1998-06/msg00107.html (7,511 bytes)
5. [AMPS] What's a Western Electric CW-701A? (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Fri, 12 Jun 1998 08:36:48 EDT; I have a brand new, right out of the box, Western Electric CW 701A. Guaranteed for 250 hours (says right on it). It's a strange looking tube with the anode wrapped around four oxide cathodes at the p; /archives//html/Amps/1998-06/msg00150.html (7,445 bytes)
6. [AMPS] 3-500Z 101 (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Tue, 16 Jun 1998 09:22:24 EDT; This may seem like a real basic question but keep in mind -- I write software for a living. As I increase the drive to my SB-221 (2x3-500Z), there is a fairly linear relationship between input drive; /archives//html/Amps/1998-06/msg00170.html (7,338 bytes)
7. [AMPS] 3-500ZG Data Sheet (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Thu, 18 Jun 1998 09:25:41 EDT; Any suggestions about where I can get my hands on a 3-500ZG data sheet? Thanks, Chris, KF0FX KF0FX@aol.com -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Admini; /archives//html/Amps/1998-06/msg00199.html (6,523 bytes)
8. [AMPS] SB-220 Price? (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Tue, 30 Jun 1998 11:23:45 EDT; << What would be a fair price for a SB-220 with no tubes? 73, Tom KE3YQ I would say $200 - $500 depending upon condition. High end if it's well maintained and has things like soft start, low current; /archives//html/Amps/1998-06/msg00260.html (6,674 bytes)
9. [AMPS] RE: Henry 8K ultra or Commander HF-2500E (score: 1): Author: KF0FX@aol.com (KF0FX@aol.com); Date: Sun, 31 May 1998 22:29:25 EDT; << The 3CX3000A7 is $795 (need one tube only) (at discount) The 3CX800A7 is $435 PER tube X 3 $1305 (at discount) The single tube (3CX3000A7) is superior for IMD and Harmonics, and much superior to t; /archives//html/Amps/1998-05/msg00001.html (7,422 bytes)
10. [AMPS] Another arc question (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Thu, 7 May 1998 12:43:45 EDT; << Arcs do not depend on the existence of a gas. Do you believe you could never get an arc in outer space, for instance? Please refer, if you will, to your sophomore physics book. In a vacuum, with a; /archives//html/Amps/1998-05/msg00091.html (11,680 bytes)
11. [AMPS] Mixing Tubes in an SB-221 (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Thu, 2 Apr 1998 13:20:43 EST; Here's the problem. I have an SB-221 with one dead Eimac 3-500Z and one that seems to be working okay (both tubes have been in the amp since 1982). The bad tube seems to have 0 cathode emission. Emis; /archives//html/Amps/1998-04/msg00011.html (7,867 bytes)
12. [AMPS] SB-220 = SB-221 ? (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Fri, 3 Apr 1998 08:57:28 EST; << Hello all I have a HEATHKIT SB-220 and is offered an SB-221. I GUESS they are alot the same (2x3-500Z). I haven't seen it yet and want to know if there is a big difference between the two? Can som; /archives//html/Amps/1998-04/msg00022.html (7,467 bytes)
13. [AMPS] Mixing Tubes in an SB-221 (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Fri, 3 Apr 1998 09:02:59 EST; << Zero emission meaning that the filament is not lit? If the filament is not lit, the solder on pin 1 or pin 5 may have melted and dripped out of the pin. Resoldering the pins using rosin flux usual; /archives//html/Amps/1998-04/msg00023.html (8,628 bytes)
14. [AMPS] SB-221 on the warc bands? (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Tue, 7 Apr 1998 16:48:48 EDT; << >Is it possible to use the SB-221 on 12-17 and 30 with out any mods. (with If the CB filter is removed, the tuned inputs are put right, and 10m is added, then12m and 17m are no prob. However, even; /archives//html/Amps/1998-04/msg00057.html (7,554 bytes)
15. [AMPS] Reliability of Tube vs Solid State Amps (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Sun, 26 Apr 1998 19:10:00 EDT; in frustration for anyone who wants to use it rather than fix it. I discovered parasitic oscillations in my SB-221 and that lead me to Rich's articles and subsequent taming of the amp. That was Heat; /archives//html/Amps/1998-04/msg00297.html (9,264 bytes)
16. [AMPS] SB-221 Suppresion on 10 Meters (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Sun, 26 Apr 1998 19:10:05 EDT; I have an SB-221 who's history is as follows: 1) Bought used in 1991 with original Eimac tubes (1982). Well constructed. 1,350 watts out. Nice, no problems. 2) 1996. Joined USAF MARS. Found SB-221 wo; /archives//html/Amps/1998-04/msg00298.html (8,563 bytes)
17. [AMPS] SB-221 Suppresion on 10 Meters (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Mon, 27 Apr 1998 19:41:53 EDT; << Chris, I'm curious about your big event - was the SB-221 keyed at the time? If you were listening, with the tubes cut off, sounds like it wasn't a parasitic. The amp was in Rx mode at the time. Tu; /archives//html/Amps/1998-04/msg00314.html (7,531 bytes)
18. [AMPS] Emission from Thoria Filaments (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Wed, 29 Apr 1998 21:15:41 EDT; There was a comment a while back about emission from a tungsten-thoria filament being the result of carburization. I had been under the impression that the thorium was used to enhance emission. And t; /archives//html/Amps/1998-04/msg00338.html (7,702 bytes)
19. [AMPS] Neat Web site -- Old Broadcast Transmitters (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Thu, 30 Apr 1998 08:19:21 EDT; This is probably old news for some, but I just came across a real nice Web site run by Jim Hawkins. He has lots of photos and data from a number of broadcast sites. Of particular interest is the 500; /archives//html/Amps/1998-04/msg00346.html (6,958 bytes)
20. [AMPS] Emission from Thoria Filaments (score: 1): Author: KF0FX@aol.com (KF0FX); Date: Thu, 30 Apr 1998 08:25:35 EDT; << - - How does one determine how much tungsten carbide has been formed?: . Tungsten is a better electrical conductor than tungsten-carbide, so one can tell how thick the tungsten-carbide layer is by; /archives//html/Amps/1998-04/msg00347.html (7,885 bytes)

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