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1. [Amps] Revisited: Power Combiners, cheap amps. (score: 206): Author: shr at medinaec.com (W0UN -- John Brosnahan); Date: Sun Jul 13 07:38:28 2003; I had always thought that the phase of a tube amp would vary all over the place as the tuning was changed. But with the ionospheric research radar transmitters that I have built this is NOT the case.; /archives//html/Amps/2003-07/msg00075.html (11,612 bytes)
2. [Amps] 4-1000 chimney (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Sun Apr 20 08:30:54 2003; Jeff, It has been a long time since I thought about the Coleman lantern chimneys--but my recollection is that the one for the double-mantle lamp will fit a 4-400 or 3-500Z but no way will it fit the; /archives//html/Amps/2003-04/msg00192.html (8,473 bytes)
3. [Amps] THANKS re the 8877 failures and GE Medical (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Sun Mar 2 19:35:28 2003; Tom-- Thanks for the clarification. I was not at ETO during the 8877 fiasco--but I was experiencing the same issues with the 3CPX1500A7s used in our 50 MHz wind profilers. Totally an EIMAC issue -- c; /archives//html/Amps/2003-03/msg00035.html (8,872 bytes)
4. [Amps] Alpha 86 (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Wed Mar 5 13:36:30 2003; Hi, Vic, Been some time since we "spoke". I always make the analogy that changing a band switch is about like open-heart surgery. It is the toughest thing to do in an amp. Certainly not impossible, A; /archives//html/Amps/2003-03/msg00198.html (8,472 bytes)
5. [Amps] Found 8874, now need chimney (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Wed Mar 12 12:17:49 2003; The "glue" is silicone RTV and the "secret" is to clamp the joint very tightly for 24 hours. Use strips of plastic or metal on both the front and back of the joint and then clamp it with those giant; /archives//html/Amps/2003-03/msg00480.html (7,277 bytes)
6. [Amps] Dealing with the manure (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Thu Mar 20 09:53:32 2003; I am reluctant to jump into this discussion--but one point of clarification needs to be made because I think Roger has made ONE serious mistake. The mistake is to lump the illegal activities of "free; /archives//html/Amps/2003-03/msg00735.html (10,863 bytes)
7. [Amps] Dealing with the manure (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Thu Mar 20 09:54:19 2003; I am reluctant to jump into this discussion--but one point of clarification needs to be made because I think Roger has made ONE serious mistake. The mistake is to lump the illegal activities of "free; /archives//html/Amps/2003-03/msg00736.html (10,854 bytes)
8. [Amps] Capacitor checker (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Sun Mar 30 08:59:07 2003; I think the "Almost All Digital" L/C Meter IIB is the best little test instrument for low value (typical HF) components for the money. There are a lot of DVMs that have C and L ranges but they are ty; /archives//html/Amps/2003-03/msg00935.html (7,904 bytes)
9. [Amps] Help ! Hard Fault 99 (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Sun Feb 2 23:07:44 2003; Jamie-- It's unfortunate that you did not read the manual in more detail. When the 87A shuts down it stores a fault code as is described in the manual. The next time you turn the 87A it will flash th; /archives//html/Amps/2003-02/msg00020.html (9,584 bytes)
10. [Amps] Help ! Hard Fault 99 (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Sun Feb 2 23:10:59 2003; Glenn--SORRY but I could not resist sending this note to "James C. Hall, MD" <nwtcc@earthlink.net> and to amps@contesting.com Here it is so you are prepared for his call! 73--John -- Jamie-- It's unf; /archives//html/Amps/2003-02/msg00021.html (9,731 bytes)
11. [Amps] Help ! Hard Fault 99 (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Sun Feb 2 23:35:02 2003; Hi, Jamie-- I didn't mean to send the copy of the Glenn note to the reflector! ;-) But now that I have I guess I will continue. Without the error code I don't know what to tell you. The AC mains issu; /archives//html/Amps/2003-02/msg00025.html (10,122 bytes)
12. [Amps] Help ! Hard Fault 99 (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Sun Feb 2 23:39:02 2003; Now the plot thickens. Are your meters this much different or is your line voltage varying? And which one is really right? You need to resolve the actual line voltage as well as the regulation of the; /archives//html/Amps/2003-02/msg00026.html (8,736 bytes)
13. [Amps] Speaking of filaments...& regulation (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Mon Feb 3 23:53:15 2003; While the ferro-resonant transformer seems like a good idea at first--there are some issues. The main thing is that they work at a single line frequency. So you can't use only one transformer for 50; /archives//html/Amps/2003-02/msg00055.html (8,497 bytes)
14. [Amps] re filaments & regulation (score: 206): Author: shr at medinaec.com (W0UN--John Brosnahan); Date: Tue Feb 4 11:59:06 2003; I didn't write that--Rich did. But either one will work--a rotary style high-wattage potentiometer--or a high-wattage power resistor with an adjustable tap. Depends on whether you just want to set it; /archives//html/Amps/2003-02/msg00073.html (7,968 bytes)

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