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1. [Amps] Alpha 87A reliability problem (score: 1): Author: shr@ricc.net (W0UN--John Brosnahan); Date: Thu, 02 Jan 2003 08:33:07 -0600; Hi, Rag-- I have three 87As that I have used fairly hard in the 1990s. Two of the amps are about ten+ years old and one is five+ years old. I have never had a PIN diode failure in any of them! From t; /archives//html/Amps/2003-01/msg00004.html (11,781 bytes)
2. [Amps] Alpha 87A reliability problem (score: 1): Author: shr@ricc.net (W0UN--John Brosnahan); Date: Thu, 02 Jan 2003 15:25:00 -0600; I am not sure about the Polyphaser units. But just stick an ohmmeter on both SO-239s and look for a short on one side and put that towards the antenna. I know the ICE ones DO show a short circuit on; /archives//html/Amps/2003-01/msg00015.html (8,965 bytes)
3. [Amps] ETO Model 70 Amplifier (score: 1): Author: shr@ricc.net (W0UN--John Brosnahan); Date: Mon, 01 Jul 2002 14:37:14 -0500; Alpha has a legacy amp page with the info you need. http://www.alpha-amps.com/html/legacy.htm If it still has a vapor phase tube in it there are no spares anywhere--so you will need to convert it to; /archives//html/Amps/2002-07/msg00008.html (8,443 bytes)
4. [AMPS] another myth on EMF (score: 1): Author: shr@ricc.net (Signal Hill Ranch); Date: Mon, 05 Nov 2001 10:45:37 -0700; I am reluctant to wade in on a discussion such as this, but as most of you know, the methodology of doing these types of correlations is very prone to error. And as proof, I offer one quick story. My; /archives//html/Amps/2001-11/msg00051.html (9,532 bytes)
5. [AMPS] Fw: alpha input swamp circuit (score: 1): Author: shr@ricc.net (Signal Hill Ranch); Date: Thu, 15 Nov 2001 07:18:32 -0700; One thing that I haven't noticed being mentioned in this discussion that was certainly a factor in the decision to use the swamp circuit was gain reduction. The FCC had just recently defined the maxi; /archives//html/Amps/2001-11/msg00258.html (7,189 bytes)
6. [AMPS] 8877 rectifier board considerations (score: 1): Author: shr@ricc.net (Signal Hill Ranch); Date: Mon, 19 Nov 2001 09:27:10 -0700; Jim-- Take a look at the boards on Paul's site. Think it might save you a lot of time. http://wd7s.home.att.net/triode_control.htm Good Luck--John W0UN John W. Brosnahan shr@ricc.net -- FAQ on WWW: h; /archives//html/Amps/2001-11/msg00329.html (10,251 bytes)
7. [AMPS] Setting the record straight--Dick Ehrhorn (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Tue, 17 Jul 2001 11:30:21 -0600; AMPS Reflector-- Rich Measures said on July 2, 2001: "Low Rp parasitic oscillation suppressors apparently work. The Alpha 86 & 87 does not use such suppressors. Around 40% of the 80-series Alpha owne; /archives//html/Amps/2001-07/msg00199.html (8,999 bytes)
8. [AMPS] Setting the record straight--Dick Ehrhorn (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Wed, 18 Jul 2001 08:33:16 -0600; Rich, I'll bite. I had an Alpha 86, and have three Alpha 87As, and an Alpha 77SX. I have never had ANY tube failures in any of them. The 87As are used quite heavily in contests and the 77SX is only; /archives//html/Amps/2001-07/msg00212.html (10,465 bytes)
9. [AMPS] amp control (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Tue, 26 Jun 2001 17:02:48 -0600; Carl-- Alpha/Power amps can be keyed by the transceiver in the classical way--but they also have keyer input/output lines so you can plug in your KEYER directly into the amp and the amp will then key; /archives//html/Amps/2001-06/msg00285.html (8,933 bytes)
10. [AMPS] 4CX1500B (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Sat, 05 May 2001 18:29:57 -0600; Have a friend who needs an Eimac 4CX1500B for his amp. He might be willing to buy a second one for a spare if the price is right. Just wonder who deals in surplus 4CX1500Bs, has good prices, and good; /archives//html/Amps/2001-05/msg00064.html (7,122 bytes)
11. [AMPS] Nichrome wire and tube chimneys! (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Sat, 12 May 2001 08:15:18 -0600; I have seen questions about low-cost chimneys on the reflector from time to time and thought I would add a note for what it's worth. Pyrex glass chimneys for the 3-400, 3-500, and 4-400 family are re; /archives//html/Amps/2001-05/msg00207.html (10,948 bytes)
12. [AMPS] Nichrome wire and tube chimneys! (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Mon, 14 May 2001 07:27:18 -0600; Understand your issue with the Coleman lantern -- but the pickle jar is shaped just like an Eimac chimney and curves the air around to the anode connection. The mouths on the pickle jar and on the Ei; /archives//html/Amps/2001-05/msg00253.html (10,041 bytes)
13. [AMPS] Vacuum Variable voltage rating (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Thu, 12 Apr 2001 10:52:36 -0600; You can get a good idea of the vacuum by just grabbing the drive mechanism and seeing you can pull it straight out. The same as reducing the capacitance but without turning the screw. A bad vacuum w; /archives//html/Amps/2001-04/msg00273.html (7,951 bytes)
14. [AMPS] Vacuum Variable voltage rating (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Thu, 12 Apr 2001 14:36:38 -0600; It is not the shaft area but the area of the bellows that is important. Most caps have a larger insert that is drilled and tapped for a 1/4 inch shaft. The air leaks around the shaft and around the i; /archives//html/Amps/2001-04/msg00280.html (9,166 bytes)
15. [AMPS] Vacuum Variable voltage rating (score: 1): Author: shr@ricc.net (W0UN--Signal Hill Ranch); Date: Fri, 13 Apr 2001 06:29:55 -0600; The leaks I have seen (maybe a dozen out of the 100+ vacuum caps I own) have all been due to failures in the bellows as far as I can tell. Don't know if it is harder on the bellows to store them at; /archives//html/Amps/2001-04/msg00295.html (8,964 bytes)

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