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References: [ +from:g4fph@mjha.co.uk: 74 ]

Total 74 documents matching your query.

1. [Amps] Base for GU-84B (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Mon, 01 Dec 2003 15:56:41 +0000
Folks, Does anyone have a recommended source of supply of bases for the above Russian tetrode? I can't work out from the drawings I have whether a Svetlana SK-3 (for 4CX1600) might do. Regards. Mark.
/archives//html/Amps/2003-12/msg00009.html (6,776 bytes)

2. [Amps] Sockets for GU-84B (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Mon, 08 Dec 2003 09:42:33 +0000
Folks, Thanks to all that replied to my request for information regarding the above. RF Parts seems to win on price, with Tom as an alternative source. I had no joy with any of the Russian sources me
/archives//html/Amps/2003-12/msg00123.html (6,860 bytes)

3. Re: [Amps] Sockets for GU-84B (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Tue, 09 Dec 2003 14:10:39 +0000
WA5QPZ de G4FPH. Dudley, Apparently RF Parts has them for $120, though I have not confirmed this with them. See: http://us.imdb.com/title/tt0081949/ I don't know whether these are new or ex-equipment
/archives//html/Amps/2003-12/msg00144.html (8,871 bytes)

4. Re: [Amps] HV SAFETY QUESTION (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Fri, 23 Jan 2004 09:30:00 +0000
Folks, I remember as a boy watching a film on TV in the late 1960s about electrical safety. They used 'SIDE' (the notes in brackets are my interpretations): S witch off (no live working) I solate (ca
/archives//html/Amps/2004-01/msg00236.html (8,833 bytes)

5. [Amps] Custom HV transformers - UK (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Mon, 03 May 2004 19:12:49 +0100
Folks, Any recommendations as to UK-based companies that will custom wind single phase, multi-kVA HV transformers suitable for valve PA's? I have had a quote from Express Transformers in Runcorn whic
/archives//html/Amps/2004-05/msg00036.html (7,032 bytes)

6. Re: [Amps] E-bay 12 tube 3-500Z deck (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Sat, 22 May 2004 16:44:04 +0100
Lane, Thanks. That made me laugh a lot! Perhaps, from the pictures, Rich, with his extensive 3-500 experience, would care to identify just a few of the reasons that make this amp. likely to disappoin
/archives//html/Amps/2004-05/msg00200.html (8,495 bytes)

7. [Amps] 4CX1500B QSK (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Mon, 01 Nov 2004 16:56:37 +0000
Folks, I'm looking to QSK an ex-commercial amplifier which uses a 4CX1500B. The amplifier has no changeover mechanism at all at present (it was part of a TX system that was on 24/7 with remote receiv
/archives//html/Amps/2004-11/msg00001.html (7,798 bytes)

8. [Amps] 4CX1500 QSK (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Tue, 02 Nov 2004 12:09:43 +0000
Rich, Karl-Arne, Many thanks for the suggestions. Having looked at the circuits for the amplifier section, I think leaving the screen Voltage present at all times and switching the grid bias would be
/archives//html/Amps/2004-11/msg00019.html (7,832 bytes)

9. Re: [Amps] Choices for valve linear project 1st timer! (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Tue, 01 Feb 2005 09:19:30 +0000
Simon, Apologies, I sent my reply (below) direct to you and not via the reflector. It just might be of interest to someone else. Ian 'SEK has given the correct reference for the Russian valve site I
/archives//html/Amps/2005-02/msg00003.html (12,210 bytes)

10. [Amps] Datong ASP (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Wed, 02 Feb 2005 11:41:40 +0000
Folks, (Not strictly an amps. issue, but I excuse my own post because it makes you sound louder when it works!) Can anyone help me out with a circuit diagram for a UK-made Datong Automatic RF Speech
/archives//html/Amps/2005-02/msg00020.html (7,403 bytes)

11. Re: [Amps] Datong ASP (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Wed, 02 Feb 2005 12:47:01 +0000
Steve, Thanks for the reply. I suspect the ASP is not that different from the original design except that it may have some sort of audio VOGAD before the clipper, so may not be too hard to fault find
/archives//html/Amps/2005-02/msg00023.html (8,611 bytes)

12. RE: [Amps] Choices for valve linear project 1st timer! (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Wed, 02 Feb 2005 23:33:59 +0000
Simon, Yes, best of luck sorting out a design. I noticed some useful ideas relating to the Russian triodes on this site: http://amp.w4zt.com/ Regards. Mark. -- At 12:38 02/02/2005, Simon Steed wrote:
/archives//html/Amps/2005-02/msg00025.html (9,359 bytes)

13. Re: [Amps] Why price difference (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Thu, 03 Feb 2005 18:11:44 +0000
Dan, Worth considering not just the cost of the initial purchase but also the 'total cost of ownership (TCO)'. As one part of the TCO-equation, some valves cost a lot more than others thesedays. Is t
/archives//html/Amps/2005-02/msg00043.html (9,959 bytes)

14. Re: [Amps] Why price difference (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Fri, 04 Feb 2005 16:49:47 +0000
Bill, Thanks for the info. Shame the one with 3 in has to be exported! Have you guys got a shortage of electric over there?!! If so, how many houses did Rich have to wire to to run his ugly bug? Happ
/archives//html/Amps/2005-02/msg00088.html (10,024 bytes)

15. Re: [Amps] GS35B Plate connection suggestions wanted (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Sat, 05 Feb 2005 20:51:29 +0000
I have a friend that built at 4 x 4CX250B PA for HF. When it came to connect to the valve tops, he drilled a hole in each the anodes and used four screws. Works fine! The GS-35 should be even more su
/archives//html/Amps/2005-02/msg00157.html (11,537 bytes)

16. Re: [Amps] 10dB and propagation (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Tue, 08 Feb 2005 17:04:02 +0000
Folks, Say, did somebody here mention amplifiers recently? Anybody? Please! I'm sure I can see a nice, cherry red 3-500 at the end of this tunnel full of dead horses!! Regards. Mark. ** Mark Hill - G
/archives//html/Amps/2005-02/msg00307.html (9,378 bytes)

17. [Amps] Bird 4314B - Overshoot when in peak mode (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Thu, 10 Feb 2005 12:37:57 +0000
Folks, Has anyone else noticed pronounced overshoot on readings taken with the above type of Bird when using it in peak mode? I recently home brewed a peak reading board for use with a Bird dual line
/archives//html/Amps/2005-02/msg00395.html (7,902 bytes)

18. Re: [Amps] mobile amp (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Tue, 08 Mar 2005 12:40:58 +0000
That reminds me: Anyone got any old Steely Dan records they want to trade? (Rich started it!) Regards. Mark. ** Mark Hill - G4FPH E-mail: g4fph@mjha.co.uk Current web pages at: www.qsl.net/g4fph Old
/archives//html/Amps/2005-03/msg00218.html (8,204 bytes)

19. Re: [Amps] Bird Element Calibration? (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Sun, 20 Mar 2005 18:43:39 +0000
Phil, I'm surprised at this. At one time, I considered getting 'P'-series (0.45 - 2.5 MHz) elements especially for use on 160. However, I was told that, for the high power elements at least, the stan
/archives//html/Amps/2005-03/msg00437.html (9,509 bytes)

20. Re: [Amps] Bird Element Calibration? (score: 1)
Author: Mark Hill <g4fph@mjha.co.uk>
Date: Mon, 21 Mar 2005 09:12:34 +0000
Phil, Further to my post of yesterday. Last night, I briefly checked the response of a Bird 2500H at 4, 3, 2, 1.8 and 1.6 MHz. The readings I took were (for a nominal 1 kW CW RF) 1050, 1100, 1030, 10
/archives//html/Amps/2005-03/msg00444.html (10,072 bytes)

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