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1. [Amps] One PS, many amps (score: 1): Author: W2RU - Bud Hippisley <W2RU@frontiernet.net>; Date: Thu, 06 Oct 2005 19:33:36 +0000; Years -- no, that's not quite right -- decades ago, W1MX used just such a system. We had a bunch of HF monoband push-pull 304TL amplifiers tied to a single HV supply. We had a single Collins exciter.; /archives//html/Amps/2005-10/msg00159.html (7,892 bytes)
2. Re: [Amps] One PS, many amps (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Thu, 6 Oct 2005 15:25:04 -0500; Frank Donovan, W3LPL is probably the world's best source of info on this type of lash-up. His multi-multi contest station, as I recall, had amps for each band, with only one power supply. It may sti; /archives//html/Amps/2005-10/msg00162.html (7,931 bytes)
3. Re: [Amps] One PS, many amps (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 6 Oct 2005 21:57:04 +0100; A separate resistor in each amp would reduce interaction and voltage drop, but a resistor is needed in the power supply as well, to handle the situation where one of the B+ leads shorts to ground. Ea; /archives//html/Amps/2005-10/msg00163.html (9,112 bytes)
4. Re: [Amps] One PS, many amps (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Thu, 06 Oct 2005 17:08:18 -0400; What about if you don't light the filament on each amp? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf; /archives//html/Amps/2005-10/msg00164.html (9,207 bytes)
5. Re: [Amps] One PS, many amps (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 6 Oct 2005 23:01:59 +0100; Workable for a single station, and for directly heated tubes; but in a multi-multi station, each amp needs full real-time metering. -- 73 from Ian G/GM3SEK http://www.ifwtech.co.uk/g3sek ____________; /archives//html/Amps/2005-10/msg00165.html (9,736 bytes)
6. Re: [Amps] One PS, many amps (score: 1): Author: David Smith <vk3hz@wia.org.au>; Date: Fri, 07 Oct 2005 10:08:59 +1000; I run amps for 2m and 70cm (both GG triodes) off a common supply. Like the original poster (Dino) is proposing, mine is set up so that only one amp can be keyed at any one time. Mine uses common ano; /archives//html/Amps/2005-10/msg00166.html (7,110 bytes)
7. Re: [Amps] One PS, many amps (score: 1): Author: Gary Schafer <garyschafer@comcast.net>; Date: Thu, 06 Oct 2005 21:38:58 -0400; I should have posed the question differently. What I was really asking was: What about applying high voltage to a tube when the filament is not powered up? Isn't that harmful to the tube? 73 Gary K4F; /archives//html/Amps/2005-10/msg00167.html (10,429 bytes)
8. Re: [Amps] One PS, many amps (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 7 Oct 2005 07:27:10 +0100; As far as I know, high voltage itself is not harmful to the tube in any way. What is actually harmful is a demand for more electron current than the filament or cathode is capable of emitting, becaus; /archives//html/Amps/2005-10/msg00169.html (8,826 bytes)
9. [Amps] One PS, many amps (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Sun, 09 Oct 2005 16:54:55 +0000; I?m wondering if for triode amps the solution may be simply to isolate the DC path from the grid to the chassis of each amp so as to prevent one amp affecting the meter readings of another amp. See m; /archives//html/Amps/2005-10/msg00209.html (7,147 bytes)
10. Re: [Amps] One PS, many amps (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 10 Oct 2005 07:16:15 +0100; But only at the risk of RF instability in each amp. I think it can be done by leaving each amp as-is, and adding a series diode from each Ia meter to the common B-minus return. If you trace the curre; /archives//html/Amps/2005-10/msg00237.html (8,862 bytes)
11. [Amps] One PS, many amps (score: 1): Author: "David G4FTC" <g4ftc@hotmail.com>; Date: Mon, 10 Oct 2005 18:32:55 +0000; Ian G/GM3SEK wrote: The decoupling ?C? will provide the RF return paths for the input and output but provide the DC isolation. But only at the risk of RF instability in each amp. Agreed - it would ne; /archives//html/Amps/2005-10/msg00250.html (8,883 bytes)
12. Re: [Amps] One PS, many amps (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 11 Oct 2005 03:23:33 -0700; The difference between the grid's resonant freq with the stock choke/capacitor grounded grid and a direct Cu strap grounded grid is about 1MHz -- with the RFC/C grounding method being the higher of t; /archives//html/Amps/2005-10/msg00268.html (10,204 bytes)

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