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1. [Amps] PowerGenius XL Video (score: 1): Author: M Gerber <wh7w.us@gmail.com>; Date: Thu, 9 Feb 2017 22:08:52 -1000; I suspect many were aware of FlexRadio and 4O3A teaming up to build and market an SSPA. Just came across a nice little video. Not sure how long ago it was posted or when amp will be available. The vi; /archives//html/Amps/2017-02/msg00024.html (7,380 bytes)
2. Re: [Amps] PowerGenius XL Video (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Fri, 10 Feb 2017 08:18:16 -0700; Interesting that the ad says 100% Duty Cycle then later says ..."ICAS"... ?? Maybe the terminology has changed over the years. 73, Dick, W1KSZ _______________________________________________ Amps mai; /archives//html/Amps/2017-02/msg00026.html (8,415 bytes)
3. [Amps] PowerGenius XL Video (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 10 Feb 2017 10:30:17 -0800; Interesting that the ad says 100% Duty Cycle then later says ..."ICAS"... ?? Maybe the terminology has changed over the years. 73, Dick, W1KSZ in the background, with 1.5 kw po on CW mode. I e-mailed; /archives//html/Amps/2017-02/msg00027.html (9,199 bytes)
4. Re: [Amps] PowerGenius XL Video (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 10 Feb 2017 13:53:35 -0500; background, with 1.5 kw po on CW mode." I noticed the same and it sounds like the same screaming jet engine noise coming from my SPE 1K-FA amp. The next SS amp here will be H2O-cooled, using the 2KW; /archives//html/Amps/2017-02/msg00028.html (7,123 bytes)
5. Re: [Amps] PowerGenius XL Video (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Fri, 10 Feb 2017 22:29:30 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: Me too. When this amp was first announced I was pretty gung ho for it, but now I'm not so sure. A single 8877 will do anything the SS amps will do except; /archives//html/Amps/2017-02/msg00029.html (8,180 bytes)
6. Re: [Amps] PowerGenius XL Video (score: 1): Author: Ken K6MR <k6mr@outlook.com>; Date: Fri, 10 Feb 2017 22:48:42 +0000; One advantage of SS amps is the ability to do SO2R with a single amp. Ive not heard of a tube amp that will change bands quickly enough to allow on the fly instant band changes (or are there?). Ken K; /archives//html/Amps/2017-02/msg00030.html (8,634 bytes)
7. Re: [Amps] PowerGenius XL Video (score: 1): Author: Kevin <kstover@ac0h.net>; Date: Fri, 10 Feb 2017 17:52:14 -0600; No way a pair or trio of 3-500Z's does 1500W FM/RTTY key down all day. An 8877 won't do it either without having a very big, very loud blower. power, I would pass on it myself. REPLY: Me too. When th; /archives//html/Amps/2017-02/msg00031.html (9,081 bytes)
8. Re: [Amps] PowerGenius XL Video (score: 1): Author: Kevin <kstover@ac0h.net>; Date: Fri, 10 Feb 2017 17:53:43 -0600; Not very well it doesn't. Ken K6MR -- ORIGINAL MESSAGE --(may be snipped) power, I would pass on it myself. REPLY: Me too. When this amp was first announced I was pretty gung ho for it, but now I'm n; /archives//html/Amps/2017-02/msg00032.html (9,803 bytes)
9. Re: [Amps] PowerGenius XL Video (score: 1): Author: "Fern Rivard" <crc@cyberlink.ca>; Date: Fri, 10 Feb 2017 17:11:50 -0700; Hey Kevin: I disagree with your comment. I have two hf amps using the 8877 and they both operate very quietly without use of humongous blower. One of them is the Viewstar PT-3000A and other one is th; /archives//html/Amps/2017-02/msg00033.html (9,958 bytes)
10. [Amps] PowerGenius XL Video (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 10 Feb 2017 17:39:28 -0800; No way a pair or trio of 3-500Z's does 1500W FM/RTTY key down all day. An 8877 won't do it either without having a very big, very loud blower. R. Kevin Stover AC0H ARRL FISTS #11993 SKCC #215 NAQCC #; /archives//html/Amps/2017-02/msg00035.html (9,364 bytes)
11. Re: [Amps] PowerGenius XL Video (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Sat, 11 Feb 2017 03:20:13 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: I have to disagree. A pair of 3-500Z's has 1 kW plate diss, which is enough if you can get 60% efficiency which is not hard. Many amps with two tubes are; /archives//html/Amps/2017-02/msg00037.html (8,690 bytes)
12. [Amps] PowerGenius XL Video (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 11 Feb 2017 00:17:41 -0800; Hey Kevin: I disagree with your comment. I have two hf amps using the 8877 and they both operate very quietly without use of humongous blower. One of them is the Viewstar PT-3000A and other one is th; /archives//html/Amps/2017-02/msg00039.html (8,305 bytes)
13. Re: [Amps] PowerGenius XL Video (score: 1): Author: Kevin <kstover@ac0h.net>; Date: Sat, 11 Feb 2017 10:51:54 -0600; All day, key down, maximum smoke? I doubt it. That seems to be the new standard around here. Any amplifier topology that can't meet that ridiculous standard isn't worthy. Oh, don't forget the 20:1 ma; /archives//html/Amps/2017-02/msg00045.html (11,053 bytes)
14. Re: [Amps] PowerGenius XL Video (score: 1): Author: Kevin <kstover@ac0h.net>; Date: Sat, 11 Feb 2017 11:06:28 -0600; Jim brings up a good point that didn't cross my work addled mind last night. On 10m FM you aren't going to get 60+% efficiency. Add to that 1500W continuous carrier on FM for lets say an hour? The Pi; /archives//html/Amps/2017-02/msg00046.html (11,915 bytes)
15. [Amps] PowerGenius XL Video (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 11 Feb 2017 10:44:40 -0800; Jim brings up a good point that didn't cross my work addled mind last night. On 10m FM you aren't going to get 60+% efficiency. Add to that 1500W continuous carrier on FM for lets say an hour? The Pi; /archives//html/Amps/2017-02/msg00052.html (11,230 bytes)
16. Re: [Amps] PowerGenius XL Video (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Sat, 11 Feb 2017 12:51:23 -0600; 8877 will do 2500 watts out CCS. Like in a Bext broadcast FM amplifier. 88-108 MHz. 73 Jim W7RY Jim brings up a good point that didn't cross my work addled mind last night. On 10m FM you aren't going; /archives//html/Amps/2017-02/msg00053.html (12,509 bytes)
17. Re: [Amps] PowerGenius XL Video (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 11 Feb 2017 14:26:40 -0500; 88-108 MHz." And the AEL FM-2.5K FM Broadcast transmitter using a single 8877 driven by a 4X150A. No extraordinary cooling was required in operation below 10,000 ft AMSL. The one I took care of duri; /archives//html/Amps/2017-02/msg00056.html (9,541 bytes)
18. Re: [Amps] PowerGenius XL Video (score: 1): Author: Ken K6MR <k6mr@outlook.com>; Date: Sat, 11 Feb 2017 20:08:28 +0000; run all day key down maximum smoke on FM and RTTY (people really do that?) Maybe not all day, but in a serious RTTY SO2R contest effort dual CQ mode will keep my amp(s) transmitting nearly 100% of th; /archives//html/Amps/2017-02/msg00058.html (12,805 bytes)
19. Re: [Amps] PowerGenius XL Video (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Sat, 11 Feb 2017 15:00:56 -0600; I built my first bandswitched 8877 amp back in the seventies for publication in the Bill Orr Handbook (which paid for the parts). When bench-testing the amp, I was surprised to see the efficiency on; /archives//html/Amps/2017-02/msg00060.html (9,204 bytes)
20. Re: [Amps] PowerGenius XL Video (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Sat, 11 Feb 2017 21:32:42 -0600; Hi Jim, My understanding is that the cathode needs a low impedance to ground in order for the high frequency plate current harmonics to develop properly. 73 Gary K4FMX _______________________________; /archives//html/Amps/2017-02/msg00069.html (10,541 bytes)

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