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1. [Amps] Revisited: Power Combiners, cheap amps. (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Sat Jul 12 10:27:52 2003; Brian, The trick would be matching the phase. With broadband solid-state amplifiers, this isn't too much of a problem. With narrow-band tube amps using hi-q tuning networks, it would be more challeng; /archives//html/Amps/2003-07/msg00072.html (9,214 bytes)
2. [Amps] 3CX400A7/8874 ??? (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Thu Jun 19 08:32:24 2003; Yes, they do, Art. I believe the warm-up timer on the Alpha 78 is set for around 2 minutes. 73 de Mike, W4EF.............. question.; /archives//html/Amps/2003-06/msg00141.html (6,921 bytes)
3. [Amps] G-G Amplifiers With No Tuned Input. (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Sun May 4 08:43:12 2003; How does the problem manifest itself, Rich. I have used the Alpha 78 quite a bit with a Kenwood TS-940, Ten-Tec Paragon, and Kenwood TS-950SDX. All of these rigs are solid state, but don't seem to ha; /archives//html/Amps/2003-05/msg00022.html (8,986 bytes)
4. [Amps] G-G Amplifiers With No Tuned Input. (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Sun May 4 08:43:15 2003; The Paragon uses a low-pass/hi-pass cascade for the receiver, but only the low-pass filters are used on the TX side. The low-pass filters are made with beefy components and switched with reed relays; /archives//html/Amps/2003-05/msg00024.html (9,091 bytes)
5. [Amps] G-G Amplifiers With No Tuned Input. (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Tue May 6 09:57:02 2003; How come all the tuned input circuits I see in amplifiers look like PI-networks, Bill? This is a low-pass configuration or am I over simplfying things? I suppose if I take a standard 3 pole low-pass; /archives//html/Amps/2003-05/msg00036.html (10,911 bytes)
6. [Amps] G-G Amplifiers With No Tuned Input. (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Tue May 6 09:57:17 2003; Yes, quite right on the output PI network, Bill. However, if you plug the values for Q=1 into a circuit simulator (I just ran them), the frequency response of a tuned input PI looks a lot like a cla; /archives//html/Amps/2003-05/msg00042.html (10,466 bytes)
7. [Amps] Spectrial purity and tank configuration (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Sat May 24 09:58:42 2003; Norm, It depends on the tuner. Many commercially available tuners are "T" networks that use two series capacitors and and shunt inductor. This forms a hi-pass network and will not improve harmonic re; /archives//html/Amps/2003-05/msg00183.html (8,587 bytes)
8. [Amps] QRO Balun? (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Tue Apr 15 22:02:07 2003; doubt Sevick has quite a bit of information in his book "Transmission Line Transformers". According to Sevick's data, measured losses for typical 4:1 ferrite baluns appear to run between 0.05 and 0.; /archives//html/Amps/2003-04/msg00164.html (8,257 bytes)
9. [Amps] Why hasn't solid state replaced tubes? (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Wed Mar 5 02:13:28 2003; A good example of where this comes into play is early in the morning on 75 meter SSB during the winter months. During the longpath opening at my sunrise, DX signals are typically right at the noise f; /archives//html/Amps/2003-03/msg00153.html (13,618 bytes)
10. [Amps] AL-80B questions (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Sun Mar 9 03:43:46 2003; in >Wyoming with an older AL-80 who apparently had similar problems 'till he installed >a different supressor. We did not install any of the other items in the kit yet. I left >him with a semi-worn; /archives//html/Amps/2003-03/msg00354.html (10,454 bytes)
11. [Amps] AL-80B questions (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Mon Mar 10 11:44:22 2003; Tom, I haven't really analyzed this problem carefully, but I always find it helpful to use extremes (as you have) to bracket the problem. As you point out, if Rp is lowered to zero, then the Xp is sh; /archives//html/Amps/2003-03/msg00429.html (14,567 bytes)
12. [Amps] TL922A and AL80A (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Wed Mar 19 10:44:28 2003; We had a TL-922A at our college club station when I was an undergraduate. I don't recall running it in the CW position very often even though we operated a lot of CW. Being young and dumb we ran the; /archives//html/Amps/2003-03/msg00709.html (7,933 bytes)
13. [Amps] TL922A and AL80A (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Wed Mar 19 22:31:03 2003; You guys keep arguing about whether a single 3-500z can be run linearly at 550mA anode current in SSB service. Has anyone actually measured the difference in IMD for a single tube run at 400mA and 5; /archives//html/Amps/2003-03/msg00722.html (8,521 bytes)
14. [Amps] Henry 2K-D (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Wed Mar 26 00:30:09 2003; I've got the power supply filters caps in this Henry 2K-D I inherited and am ready to test it. Does anyone know it provides WARC coverage (e.g. does anyone know where the plate choke resonates)? Some; /archives//html/Amps/2003-03/msg00834.html (6,636 bytes)
15. [Amps] Henry 2K-D (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Wed Mar 26 01:41:56 2003; Phil, I took a second look at the manual and found that it says "the amplifier can be operated at most frequencies outside the amateur bands", so I went ahead and checked it on 30, 17, and 12 meters.; /archives//html/Amps/2003-03/msg00836.html (7,934 bytes)
16. [Amps] Cheap 1500 Watt Amps? (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Fri Feb 14 12:02:13 2003; Dan, I would suggest you talk to Stan, K5GO. I think he is using Drake L-4B's with homebrew power supplies. Myself I have a couple of Drake L-7's here which can be found pretty cheap on Ebay, but the; /archives//html/Amps/2003-02/msg00327.html (8,969 bytes)
17. [Amps] HV Filter Caps (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Thu Feb 27 02:40:10 2003; Can anyone recommend a source for good computer grade electrolytics? I just had one let go in the HV supply of a Henry 2K-D (miniature Mt. St. Helens). The specifcations are as follows: Electrical: 1; /archives//html/Amps/2003-02/msg00490.html (6,549 bytes)
18. [Amps] HV Filter Caps (score: 200): Author: W4EF at dellroy.com (Michael Tope); Date: Fri Feb 28 20:00:23 2003; Thanks for all of the replies, gents. Lots of good suggestions for replacements sources! I will probably replace all of the caps and the equalizing resistors in the HV supply just to play it safe. 73; /archives//html/Amps/2003-02/msg00517.html (7,500 bytes)

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