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1. [Amps] RF choke selection (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Tue, 2 Jul 2002 15:26:30 +0100; Hello all I've just re-subscribed to this list, so here's a question for everyone :- I'm trying to modify a surplus RF deck (an auto-tune 2 - 30 MHz tube amp.) which has a 3-section plate choke. One; /archives//html/Amps/2002-07/msg00045.html (7,649 bytes)
2. [AMPS] WTB B&W 852 or 195-2 (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Fri, 22 Feb 2002 22:48:47 -0000; Hello all I want to buy a B&W 852 Pi-tank assembly, or similar 160 - 10m Pi coil assembly without the bandswitch e.g. B&W 195-2 I'll pay all shipping costs from the U.S.A. or wherever to Scotland of; /archives//html/Amps/2002-02/msg00233.html (6,813 bytes)
3. [AMPS] (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Thu, 2 Aug 2001 15:17:57 +0100; Not really John - according to reports you have to have a fire-extinguisher handy if you want to use the Mark V in Class-A !! -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@conte; /archives//html/Amps/2001-08/msg00016.html (6,494 bytes)
4. [AMPS] Replacing 8873 (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Tue, 19 Jun 2001 07:03:46 +0100; Hello all My OT friend Tom GM2BMJ needs to replace the 8873 in his Heathkit amp. I told him that replacement tubes are difficult to find and expensive. Any suggestions about either a source of 8873 t; /archives//html/Amps/2001-06/msg00151.html (7,160 bytes)
5. [AMPS] Sucking instead of Blowing (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Tue, 29 May 2001 21:58:27 +0100; Hello all I've been off this reflector for a few weeks - hope my comments are relevant to this cooling discussion. I have a homebrew amp. with a single QY5-500 (looks a bit like a large 3-500z) which; /archives//html/Amps/2001-05/msg00499.html (8,439 bytes)
6. [AMPS] Sucking instead of Blowing (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Wed, 30 May 2001 18:25:13 +0100; Hi Rich, Phil, Peter et al The QY5-500 is a bit of a turkey of a valve - it's described as a 'radiation-cooled tetrode' - needs about 5kV on the anode to deliver any real power, and it's a class-C va; /archives//html/Amps/2001-05/msg00529.html (8,301 bytes)
7. [AMPS] Changing tubes (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Sat, 17 Mar 2001 13:04:13 -0000; Hello all If you have a 2-tube amplifier and say, 2 spare new tubes, is there really any advantage in changing the tube sets over every year, or whenever ? I know that glass tubes need to be used per; /archives//html/Amps/2001-03/msg00155.html (7,169 bytes)
8. [AMPS] 4CX1600B (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Sat, 10 Feb 2001 11:14:09 -0000; Hello all I was going to modify a homebrew amp. to use a 4CX1600B (+SK3A base) but get the same message from 2 different suppliers "The 4CX1600B is not available in the U.S.A. at the moment" Does any; /archives//html/Amps/2001-02/msg00212.html (7,164 bytes)
9. [AMPS] Runaway amp (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Tue, 20 Feb 2001 17:01:20 -0000; Hi Mike et al Interesting problem - are you measuring the grid bias and screen volts at the socket pins, or remotely (e.g. some test point) ? It could be several things, but I'd put my money on a gri; /archives//html/Amps/2001-02/msg00272.html (7,680 bytes)
10. [AMPS] HV PSU Question (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Mon, 1 Jan 2001 20:09:39 -0000; Hi Phil - Happy New Year to you and the 'amps' reflectees This sounds like one of the HV xfmrs used in 2 x 4-400A Marconi amps. for Band II FM ? The 4-400As had about 5.5 - 6.0 kV on the anode and th; /archives//html/Amps/2001-01/msg00019.html (8,775 bytes)
11. [AMPS] Feedback path 3-500Z (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Mon, 2 Oct 2000 18:28:26 +0100; Rich writes :- There was No oscillation in the amplifier. Pulsed DC and a tuned circuit produced RF - the same way that spark transmitters produced RF. My spark TX theory is a bit rusty, but surely t; /archives//html/Amps/2000-10/msg00055.html (8,169 bytes)
12. [AMPS] 30S-1 power output (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Tue, 5 Sep 2000 15:32:43 +0100; Hi Jim et all 4CX1500B...has same screen dissipation (12W) but LESS (nominally zero W) grid dissipation. In many ways the 1000A is a better tube than the 1500B - you get just as much RF out with the; /archives//html/Amps/2000-09/msg00103.html (8,157 bytes)
13. [AMPS] 30S-1 power output - correction (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Tue, 5 Sep 2000 15:44:54 +0100; Sorry guys - got this wrong - the 1000A is 'zero' W grid diss. and the 1500B is 1 W ! 73 Chris GM3WOJ www.qsl.net/gm3woj/ -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesti; /archives//html/Amps/2000-09/msg00106.html (6,782 bytes)
14. [AMPS] 4CX1000A grid current (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Thu, 7 Sep 2000 17:10:42 +0100; Hello all This reflector is getting busy ! Difficult to get a word in on the frequency ! I have a homebrew 4CX1000A amplifier (passive grid, grounded cathode) and over the past few months the grid cu; /archives//html/Amps/2000-09/msg00223.html (7,679 bytes)
15. [AMPS] Sked please - Rich and Tom (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Fri, 8 Sep 2000 20:19:58 +0100; Hello all I've read so much from both Rich and Tom on this reflector recently, I'd like to talk to them on the radio (using an amplifier of course!) I did a log search and neither callsign is in the; /archives//html/Amps/2000-09/msg00308.html (7,271 bytes)
16. [AMPS] Re: Sked with Rich and Tom (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Sat, 9 Sep 2000 19:46:25 +0100; Hi Phil W2GE et al Well I worked Tom, and 2 other 'amps reflectees' Mike WY6K and Don VE3RM, but couldn't hear Rich. Can't try again next weekend but still hoping to work AG6K soon. Tom told me about; /archives//html/Amps/2000-09/msg00375.html (6,793 bytes)
17. [AMPS] shortwave Tx (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Sat, 16 Sep 2000 06:47:59 +0100; Bill W7TI wrote :- <snip> AND, most important for us AMPS enthusiasts, Bill - dozens of 10kW, 50kW+ etc. surplus transmitters for the HF Bands ! Maybe.... (transport costs would be to high for here!; /archives//html/Amps/2000-09/msg00800.html (7,715 bytes)
18. [AMPS] Drake L7: first check (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Mon, 25 Sep 2000 17:55:45 +0100; Hi Jose I would not recommend this - you are in great danger from the HV - I have worked with amps. for 30 years and you can only really work with HV if you follow a rigid set of safety rules - what; /archives//html/Amps/2000-09/msg00993.html (7,454 bytes)
19. [AMPS] Dumb directly heated cathode amp operational questions (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Wed, 7 Jun 2000 15:27:57 +0100; Hi Bill et al I would suggest more like 3 - 4 minutes, Bill. The 3-500z is a radiation-cooled tube i.e. most of the heat is infra-red radiated by the plate structure, and absorbed by the surrounding; /archives//html/Amps/2000-06/msg00054.html (10,288 bytes)
20. [AMPS] 50MHz 8877 amp. plate circuit (score: 1): Author: gm3woj@talk21.com (Chris Tran GM3WOJ); Date: Mon, 8 May 2000 16:12:38 +0100; Monday 8th May 2000 Hello all I've finally finished a 6m amp. using an 8877, and the output Pi network does not resonate, even with very low values of inductance, because of (I'm guessing) approx. 25; /archives//html/Amps/2000-05/msg00106.html (8,514 bytes)

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