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1. [Amps] stability of amps (score: 1): Author: "c.s." <carlseye@verizon.net>; Date: Mon, 24 Sep 2007 17:50:23 -0400; In my previous "diatribe" I addressed a very annoying issue!! ( IE) advertising for amps, that are WAY above the known useful range of the tubes being used !!!! I have been on this list for a number; /archives//html/Amps/2007-09/msg00228.html (6,998 bytes)
2. Re: [Amps] stability of amps (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 24 Sep 2007 23:35:12 +0100; How does the instability show - what frequency is any oscillation at? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/l; /archives//html/Amps/2007-09/msg00231.html (6,868 bytes)
3. Re: [Amps] stability of amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 25 Sep 2007 00:55:31 +0200 (CEST); I suspect the real question is: Does anyone have the s (or y or z) parameterts of the 572B at frequencies up to 50 MHz and beyond? This would tell you the potential stability. My experience with 572B; /archives//html/Amps/2007-09/msg00232.html (7,783 bytes)
4. Re: [Amps] stability of amps (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Mon, 24 Sep 2007 20:00:00 -0400; Peter, the 572B has the same basic form as the 811A which is rated to 54 MHz. Just because Cetron built an audio tube and simply said 30MHz sounds like a good number doesnt mean its gospel. The first; /archives//html/Amps/2007-09/msg00234.html (9,963 bytes)
5. Re: [Amps] stability of amps (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 24 Sep 2007 20:17:31 -0400; I would too, but that's because I like to use a tube on a frequency where it is very stable and predictable. That means well below the self-neutralizing frequency...not above. I once made sweep tube; /archives//html/Amps/2007-09/msg00235.html (8,127 bytes)
6. Re: [Amps] stability of amps (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Mon, 24 Sep 2007 20:49:53 -0400; If its repeatable it is called engineering. If it works once and then you write an article about how smart you are that is called something else. I see that the Ameritron AL-572 that you may have wor; /archives//html/Amps/2007-09/msg00237.html (8,871 bytes)
7. Re: [Amps] stability of amps (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Mon, 24 Sep 2007 21:26:58 -0400; The Vega was fine once they switched to the Pontiac Iron Duke engine. Rust out was not an engineering issue, strictly cheapskates in the front office. Lots of nice south west examples are up here as; /archives//html/Amps/2007-09/msg00240.html (11,137 bytes)
8. Re: [Amps] stability of amps (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 24 Sep 2007 22:39:09 -0400; Well you start on Karl and then try to flame me. Never really happy with anyone who disagrees with you are you? Seriously Carl if you can settle down a bit and quit flaming, good or accurate enginee; /archives//html/Amps/2007-09/msg00241.html (9,189 bytes)
9. Re: [Amps] stability of amps (score: 1): Author: kd4e <doc@kd4e.com>; Date: Mon, 24 Sep 2007 22:36:06 -0500; To this amateur Amateur the design concept here looks really elegant: http://www.qsl.net/ve5ri/cyclops.htm What is the perspective of the assembled amplifier-gurus? It sounds as though he has enginee; /archives//html/Amps/2007-09/msg00243.html (8,150 bytes)
10. Re: [Amps] stability of amps (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 24 Sep 2007 23:07:13 -0400; It's a simple swamped grid to stabilize the amplifier. The 200 ohm grid resistor loads the control grid. Hopefully the resistor loads the grid so much that the feedback capacitance is insufficient t; /archives//html/Amps/2007-09/msg00244.html (9,394 bytes)
11. Re: [Amps] stability of amps (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Tue, 25 Sep 2007 05:53:04 +0200; That design has nothing to do with neutralization, there is none. It´s just passive grid, I did that quite often with tetrodes and it always worked very well for me. 73 Peter --Original Message; /archives//html/Amps/2007-09/msg00245.html (9,018 bytes)
12. Re: [Amps] stability of amps (score: 1): Author: Gudguyham@aol.com; Date: Tue, 25 Sep 2007 01:26:14 EDT; If you can make a 572B stable at 50 mhz, then why can't it be stabilized at 30 mhz.????? carl / kz5ca OK, I will take a snare at this question.....If you built an SB-200 just for 10 meters with a nic; /archives//html/Amps/2007-09/msg00247.html (8,263 bytes)
13. [Amps] stability of amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 25 Sep 2007 10:33:01 +0200 (CEST); compensation in the grid for higher frequencies. The 4CX3000 has about 130pF of input capacitance plus whatever the circuit adds. That's less than 44 ohms reactance shunting the 200 ohms on 28MHz. Yo; /archives//html/Amps/2007-09/msg00250.html (8,913 bytes)
14. Re: [Amps] stability of amps (score: 1): Author: kd4e <doc@kd4e.com>; Date: Tue, 25 Sep 2007 09:31:31 -0500; The nay-sayers suggest that this http://www.qsl.net/ve5ri/cyclops.htm successful 160-10M contest-tested Eimac 4CX1500B power tetrode amp is sub-standard in design and may suffer as to spectral purity; /archives//html/Amps/2007-09/msg00261.html (12,281 bytes)
15. Re: [Amps] stability of amps (score: 1): Author: Gudguyham@aol.com; Date: Tue, 25 Sep 2007 09:54:48 EDT; WDYT? I take this to mean What do you think? If you ask me Doc I think your summary of all this gets right to the point! I admire how well you said it all and don't think I could have said it any bet; /archives//html/Amps/2007-09/msg00263.html (8,102 bytes)
16. Re: [Amps] stability of amps (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Tue, 25 Sep 2007 10:37:07 -0400; There was no flame involved, I was simply repeating some prior postings. I suggest that you read some of your own writings sometime Tom before starting on another of your "not invented by me" rants.; /archives//html/Amps/2007-09/msg00269.html (11,083 bytes)
17. Re: [Amps] stability of amps (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 25 Sep 2007 11:34:36 -0400; The nay-sayers suggest that this http://www.qsl.net/ve5ri/cyclops.htm successful 160-10M contest-tested Eimac 4CX1500B power tetrode amp is sub-standard in design and may suffer as to spectral Well,; /archives//html/Amps/2007-09/msg00274.html (10,228 bytes)
18. Re: [Amps] stability of amps (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 25 Sep 2007 11:37:02 -0400; I already explained that in great detail. If you read more carefully you will accuse people of things less. 73 Tom _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2007-09/msg00275.html (9,392 bytes)
19. Re: [Amps] stability of amps (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Tue, 25 Sep 2007 08:54:21 -0700 (GMT-07:00); And, then there is the Gee Bee airplane. Jimmy Doolittle, flying a Gee Bee, won a major air race. Problem was that almost every pilot who flew it died. The design finally disappeared, and all of the; /archives//html/Amps/2007-09/msg00280.html (10,060 bytes)
20. Re: [Amps] stability of amps (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 25 Sep 2007 12:00:29 -0400; Of course, and everyone agrees on that point. The problem is when people try to rewrite good engineering or science or badmouth others based on some esoteric lucky design. The fact is a 572B is a lo; /archives//html/Amps/2007-09/msg00281.html (8,856 bytes)

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