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361. Re: [Amps] Query: AC Switching of High voltage (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Wed, 7 Sep 2005 06:44:33 -0700
Hi Ron: There are two different timing circuits used on the 76A. I converted one of my amps to use 3CX800A7 tubes and simply added capacitance to easily get 3 minutes. One problem with the mercury re
/archives//html/Amps/2005-09/msg00068.html (7,341 bytes)

362. Re: [Amps] MTBF Thread... (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Wed, 14 Sep 2005 09:36:01 -0700
My wife believes that one long MTBF is better than many short MTBF. Colin K7FM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma
/archives//html/Amps/2005-09/msg00122.html (7,487 bytes)

363. Re: [Amps] RE : Alpha releases New Amp 9500 (score: 1)
Author: Colin Lamb <k7fm@teleport.com>
Date: Fri, 16 Sep 2005 08:43:10 -0700 (GMT-07:00)
The Alpha 9501 model, on the drawing board, has a built in computer that will respond to suggestions on the Amps reflector, and also has a built in program to automatically check for parasitic oscill
/archives//html/Amps/2005-09/msg00143.html (10,064 bytes)

364. Re: [Amps] 4CX1500B (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Wed, 21 Sep 2005 05:37:45 -0700
"4CX1500B works great in a 30S1 which I think is the same configuration gfz" No, not same configuration. The 30S1 used conventional cathode drive, with control grid and screen grid operating on corre
/archives//html/Amps/2005-09/msg00260.html (7,736 bytes)

365. Re: [Amps] 3rd Order IMD (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Wed, 21 Sep 2005 16:20:29 -0700
The KWM2 uses negative feedback so that the output of the transmitter is cleaner than the 6146 tubes. Collins is excellent in using negative feedback to clean up the signals - which is why the Collin
/archives//html/Amps/2005-09/msg00277.html (6,973 bytes)

366. [Amps] Transformer Efficiency Question? (score: 1)
Author: Colin Lamb <k7fm@teleport.com>
Date: Fri, 23 Sep 2005 15:00:02 -0700 (GMT-07:00)
I have a 6.5 KW 120 volt Onan generator. I have been told that because it uses a transformer as part of a regulator system that it is not recommended to reconnect to produce 240 output. Question: Wha
/archives//html/Amps/2005-09/msg00314.html (7,456 bytes)

367. Re: [Amps] grid dipper (score: 1)
Author: Colin Lamb <k7fm@teleport.com>
Date: Sun, 25 Sep 2005 07:13:24 -0700 (GMT-07:00)
zzHi Carl: The 955 tube is very common. Still available new in oroginal box. AES has some. These old tubes are easier to get than many transistors produced only 15 years ago. A lot of signal generato
/archives//html/Amps/2005-09/msg00320.html (9,034 bytes)

368. Re: [Amps] re 955 (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Tue, 27 Sep 2005 19:23:04 -0700
"Hi,re acorn tubes,I have quantities of new in carton 954,955 956 and 958 acorn tubes if anybody interested. Bob VK3ZL." Do you have the air system sockets? With proper airflow design, you can get 5
/archives//html/Amps/2005-09/msg00342.html (7,238 bytes)

369. Re: [Amps] re 955 (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Tue, 27 Sep 2005 20:22:30 -0700
Hi Barrie: I ran 4 x 6AG7 tubes in grounded grid for some time with 200 watts input. The big problem is that you cannot see the plates. The amp still has the original tubes in it and sits in a box in
/archives//html/Amps/2005-09/msg00346.html (7,436 bytes)

370. Re: [Amps] Millen dipper (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Fri, 30 Sep 2005 16:49:25 -0700
I have at least 3 Millen grid dip meters. Both the tube and solid state version have a much better dial calibration than the one you ended up with. The third one I converted from tube to solid state
/archives//html/Amps/2005-09/msg00394.html (7,672 bytes)

371. Re: [Amps] Ameritron AL-811H-- Again (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Sat, 1 Oct 2005 07:56:53 -0700
"In my survey of Alpha 87 and 88 owners, c. 40% had needed to return theirs to the factory hospital" Note - attribution marks left out on purpose. Quotation marks used to indicate I was quoting someo
/archives//html/Amps/2005-10/msg00009.html (8,693 bytes)

372. Re: [Amps] Ameritron AL-811H-- Again (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Sat, 1 Oct 2005 18:35:00 -0700
" This was c. the same time that I found out that General Electric Medical had cancelled a contract with Dick because he failed to fix the problem of sudden 8877 failures in a MRI amplifier that he w
/archives//html/Amps/2005-10/msg00028.html (8,555 bytes)

373. Re: [Amps] Power cord to use when converting AL-80B to 240 volts? (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Sun, 2 Oct 2005 12:47:26 -0700
If the mains cable for the amp is designed for 120 volts, it will handle 240 volts. The current is 1/2 at 240 volts, so you could actually make the cable smaller. Regarding voltage rating, each wire
/archives//html/Amps/2005-10/msg00051.html (8,363 bytes)

374. Re: [Amps] What's inside a vacuum relay? (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Wed, 5 Oct 2005 07:39:03 -0700
Ian said "besides, it would let all the good stuff out" Shouldn't that be "all the bad stuff in"? Colin K7FM _______________________________________________ Amps mailing list Amps@contesting.com http
/archives//html/Amps/2005-10/msg00132.html (6,998 bytes)

375. [Amps] Fw: What's inside a vacuum relay? (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Wed, 5 Oct 2005 07:43:58 -0700
Ignore the last post. My e-mail program just jumbled all the received e-mails and I was responding to a post Ian had in 2003. Like really bad mail service. 73, Colin K7FM ____________________________
/archives//html/Amps/2005-10/msg00133.html (6,547 bytes)

376. Re: [Amps] 2006 ARRL Radio Handbook (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Fri, 7 Oct 2005 20:02:50 -0700
"Am I to understand that you guys have written a better handbook?" No - but they do use Kevlar for their A frame supports. Colin K7FM _______________________________________________ Amps mailing list
/archives//html/Amps/2005-10/msg00181.html (7,764 bytes)

377. Re: [Amps] amateur code (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Sun, 9 Oct 2005 16:06:57 -0700
"BALANCED.radio is an avocation, never interfering with duties owed to family, job, school or community." Boy, wonder how many of these boy scouts are on top of the contest heap. Wasn;t it the Archdu
/archives//html/Amps/2005-10/msg00229.html (7,595 bytes)

378. Re: [Amps] Center Tapped Secondary Circuit (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Wed, 19 Oct 2005 06:42:28 -0700
Spike Protection _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2005-10/msg00455.html (6,809 bytes)

379. Re: [Amps] Amp 101 (score: 1)
Author: Colin Lamb <k7fm@teleport.com>
Date: Fri, 28 Oct 2005 13:40:00 -0700 (GMT-07:00)
"Can anyone recommend a good source of information on the basics of testing and eventually tuning/operating such a beast?" Try reading the operator's manual. Often the designer knows more than some s
/archives//html/Amps/2005-10/msg00665.html (7,215 bytes)

380. Re: [Amps] Read this- buyer beware- identity revealed (score: 1)
Author: "k7fm" <k7fm@teleport.com>
Date: Sun, 30 Oct 2005 05:14:58 -0800
A few years ago I had a similar experience with a ham in Detroit. I filed a complaint with the postal authorities. They did nothing. I read the rules at the time I was corresponding with the post off
/archives//html/Amps/2005-10/msg00688.html (9,176 bytes)

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