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Total 30 documents matching your query.

1. [Amps] Grounded Screen 4CX1500B (score: 1): Author: Shawn Tayler <amps@xmtservices.net>; Date: Sun, 6 Nov 2005 20:12:07 -0800; Hi Guys, Playing with my 30S-1 has gotten me thinking about a project. I've been wanting an amp for 50Mhz for a while and I have 2 4CX1500B's lating around as spares. One would make a nice amp on 6M; /archives//html/Amps/2005-11/msg00082.html (6,940 bytes)
2. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 7 Nov 2005 07:52:44 +0000; There are two separate issues here: RF grounding, and power supplies. The RF grounding issue is thoroughly discussed in the description of a 4CX1000 amp for 2m that was in the ARRL Handbooks for seve; /archives//html/Amps/2005-11/msg00083.html (9,619 bytes)
3. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 7 Nov 2005 02:35:36 -0800; Less power gain in cathode driven config. Wasn't it grounded-screen, grid-driven, not grounded-screen cathode-driven? A seriously bypassed cathode means that it's grid driven. Richard L. Measures, AG; /archives//html/Amps/2005-11/msg00085.html (8,420 bytes)
4. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Shawn Tayler <amps@xmtservices.net>; Date: Mon, 7 Nov 2005 04:50:31 -0800; On Mon, 7 Nov 2005 07:52:44 +0000 Ian White G/GM3SEK <gm3sek@ifwtech.co.uk> exclaimed: Thank you Ian, I will peruse your site for these! I was curious on the 4CX1000A for 2M in the ARRL book. I thoug; /archives//html/Amps/2005-11/msg00087.html (11,294 bytes)
5. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Shawn Tayler <amps@xmtservices.net>; Date: Mon, 7 Nov 2005 04:54:13 -0800; On Mon, 7 Nov 2005 02:35:36 -0800 R. Measures <r@somis.org> exclaimed: Hello Rich, Interesting that you say this. I was under that same impression from conversations through the years. I was happy to; /archives//html/Amps/2005-11/msg00088.html (9,710 bytes)
6. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 7 Nov 2005 12:57:31 +0000; That's news to me, so I'd be happy to learn more. -- 73 from Ian G/GM3SEK http://www.ifwtech.co.uk/g3sek _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2005-11/msg00089.html (8,152 bytes)
7. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: "G0RUZ_Conrad" <conrad@g0ruz.com>; Date: Mon, 7 Nov 2005 12:58:56 -0000; Shawn I operated the 2m amp for several years on eme. There was a problem with the 3rd harmonic which appeared to be a result of cavity resonances in the output compartment. I cured it with a 100 ohm; /archives//html/Amps/2005-11/msg00091.html (13,503 bytes)
8. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: "Jim Tonne" <tonne@comcast.net>; Date: Mon, 7 Nov 2005 09:14:23 -0500; Conrad: Regarding a resistor in the PA cabinet, absorbing harmonic energy: it is not anedotal! Quite true, being used at Continental Electronics. But the position is important and has to be done by c; /archives//html/Amps/2005-11/msg00092.html (8,513 bytes)
9. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>; Date: Mon, 7 Nov 2005 08:17:39 -0600; Perfect arrangement. There is a very nice review of grounded screen designs, including the pros and cons in Sabin's "Single Sideband Systems and Circuits" book (an excellent book which everyone shoul; /archives//html/Amps/2005-11/msg00093.html (10,281 bytes)
10. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 7 Nov 2005 14:43:00 +0000; The 30S-1 is cathode driven (I'm looking at the schematic now). G1 is mostly grounded to RF by a 220pF capacitor, but RF negative feedback is also applied at this point by a 5pF cap from the anode. G; /archives//html/Amps/2005-11/msg00094.html (9,182 bytes)
11. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 7 Nov 2005 07:07:26 -0800; The 30S-1 is cathode-driven because no signal applied between the grid and the cathode. The screen grid is grounded and the control grid is at the same signal potential as the cathode. Thus, the driv; /archives//html/Amps/2005-11/msg00095.html (11,669 bytes)
12. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 7 Nov 2005 16:38:28 +0000; It is cathode-driven because the RF input is connected to the cathode - and nothing else (still looking at the schematic here). Yes... The control grid and cathode are not connected in the 30S-1. G1; /archives//html/Amps/2005-11/msg00096.html (8,990 bytes)
13. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 7 Nov 2005 18:50:34 +0100; Have also seen this used in the Granger 172-2 MF/HF 5 kW amplifier. Two 100 ohm Globar resistors were placed near the anode cooler of the P-290A, with one end grounded and the other end "floating". T; /archives//html/Amps/2005-11/msg00097.html (10,684 bytes)
14. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Mon, 07 Nov 2005 18:48:37 +0000; Many moons ago (10~15 years) a friend G8WYI and I built an amp with a pair of 4CX1000A's on 2m. The unit never did perform properly and is sitting in my garage in a pretty much useless state. The scr; /archives//html/Amps/2005-11/msg00098.html (10,409 bytes)
15. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 7 Nov 2005 13:39:08 -0800; Push-pull or parallel 4cx1000As? -- What is the resistance of the grid swamper? cheerz, David Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Am; /archives//html/Amps/2005-11/msg00100.html (11,880 bytes)
16. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: R.Measures <r@somis.org>; Date: Mon, 7 Nov 2005 13:43:46 -0800; Not connected DC-wise, but for RF, there is virtually no signal potential between the grid and the cathode. Agreed, and the driving signal is applied to the cathode, so the 30S-1 is Class AB1 cathode; /archives//html/Amps/2005-11/msg00101.html (10,040 bytes)
17. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 7 Nov 2005 22:30:46 +0000; Because G1 receives a small fraction of the anode voltage as negative feedback, it moves in the same direction as the instantaneous RF cathode voltage, but I think that "virtually no" signal potentia; /archives//html/Amps/2005-11/msg00102.html (9,176 bytes)
18. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Mon, 07 Nov 2005 23:17:21 +0000; as in the weasel, - push pull with a U-shaped anode line. I can't recall if there was one at all. I had no desire to waste power -- David Kirkby, G8WRB Please check out http://www.g8wrb.org/ of if yo; /archives//html/Amps/2005-11/msg00104.html (8,278 bytes)
19. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Shawn Tayler <amps@xmtservices.net>; Date: Mon, 7 Nov 2005 21:01:20 -0800; Wow Ian, I had totally missed that. The input circuits were right next to the grid circuit and I had simply assumed. Well how about that. Hmmm, very interesting. Kinda burst the bubble for me. I must; /archives//html/Amps/2005-11/msg00106.html (11,145 bytes)
20. Re: [Amps] Grounded Screen 4CX1500B (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 8 Nov 2005 07:43:37 +0000; The problem is that everything about the 30S-1 is more weird than you think it's going to be. It's a fascinating design, full of complexities caused by the decision to cathode-drive a tetrode. You ha; /archives//html/Amps/2005-11/msg00107.html (9,828 bytes)

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