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301. Re: [Amps] AL80b low power (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 22 Mar 2013 21:42:05 -0500
Let RF Parts know so they can be prepared to deny your warranty claim about a year from now (or less). 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.co
/archives//html/Amps/2013-03/msg00293.html (7,974 bytes)

302. Re: [Amps] What is max grid current for YC-156 ?? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 24 Mar 2013 05:56:19 -0500
Isn't there a data sheet for that tube? 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2013-03/msg00318.html (6,928 bytes)

303. Re: [Amps] Fw: Need Caps for Titan II Please (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 11 Apr 2013 17:39:02 -0500
you don't need caps from ten tec which would probably not be all that good anyway. They usually used disc ceramics which were sub-par when it came to handling continuous duty current on 160 m. I'd in
/archives//html/Amps/2013-04/msg00077.html (8,887 bytes)

304. Re: [Amps] Transmit signal monitoring AM & SSB (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Thu, 30 Jul 2015 08:53:41 -0500
I run a ten tec centurion modified for AM. I also operate a pair of 3-400Zs modulated by 572Bs. For the modified slopbucket amp I use an old SB610 monitor scope for the fake trapezoid display. I say
/archives//html/Amps/2015-07/msg00185.html (10,648 bytes)

305. [Amps] Capacitor and Alpha 374 question (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 21 Aug 2016 05:36:52 -0500
Run the amplifier until you hear the hum then shoot a temperature of the cap with an IR thermometer. Take the cap temp. when at room temperature first. The temperature shouldn't rise much if any. If
/archives//html/Amps/2016-08/msg00055.html (8,923 bytes)

306. Re: [Amps] "Conventional" current flow (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 2 Nov 2016 18:32:29 -0500
Guys, you can disagree all you want and go to your graves frustrated, but the world isn't going to do a 180 and have a BC / AD on this to satisfy your personal sense of how things ought to be. A cent
/archives//html/Amps/2016-11/msg00021.html (7,729 bytes)

307. Re: [Amps] 1/4" to 1/4" shaft couplers (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 19 Nov 2016 11:10:11 -0600
http://mgs4u.com/RF-Microwave/ceramic.htm Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2016-11/msg00060.html (7,364 bytes)

308. Re: [Amps] Machlett 3-500Z tubes (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 26 Nov 2016 11:31:35 -0600
Taylor, Machlett and RCA have all been purchased by new companies. Taylor and Machlett are merely brands for tubes made in China now. A company in Ohio? can't remember where, bought the RCA brand to
/archives//html/Amps/2016-11/msg00126.html (8,494 bytes)

309. Re: [Amps] Amps] SB-220 update & gettering (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 26 Nov 2016 11:34:08 -0600
I disagree. The internal graphite anode tubes must have color to de-gas and stay gettered. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lis
/archives//html/Amps/2016-11/msg00127.html (6,853 bytes)

310. Re: [Amps] SB-220 update and gettering (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 26 Nov 2016 13:57:09 -0600
You're sending me a long paper from 1935 30 years before the 3-500Z, which is the tube I am discussing, although I may have incorrectly described it as an internal anode graphite tube. I don't have t
/archives//html/Amps/2016-11/msg00131.html (8,753 bytes)

311. Re: [Amps] SB-220 update and gettering (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 27 Nov 2016 06:19:28 -0600
John, Thanks for your thoughtful response but I'm sticking with my m.o. on 3-400/500/1000Zs and the other post-1950 Eimac fire bottles. FB on all--you mention a number of excellent sources, but none
/archives//html/Amps/2016-11/msg00144.html (8,413 bytes)

312. Re: [Amps] "Conventional" current flow (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 2 Dec 2016 11:35:34 -0600
It's true with any amplifier tubes and vacuum diodes. the positive charge is to the cathode from grid and plate. Except of course diodes don't have grids. 73 Rob K5UJ ________________________________
/archives//html/Amps/2016-12/msg00016.html (8,697 bytes)

313. Re: [Amps] Conventional" current flow (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 3 Dec 2016 05:58:35 -0600
Dick and others, Go to a hamfest and look for an old RCA Tube Manual. The first 30 to 50 pages is a complete explanation of how tubes work, complete with illustrations. You can usually pick one up fo
/archives//html/Amps/2016-12/msg00027.html (7,679 bytes)

314. Re: [Amps] Stock up on tubes? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 4 Dec 2016 06:19:20 -0600
As hams drink the solid state kool-aide and rush out to unload their perfectly good tube gear and buy dinky little light weight plastic boxes with heat sinks, the rest of us reap the benefits of the
/archives//html/Amps/2016-12/msg00055.html (8,559 bytes)

315. Re: [Amps] The cost of amplifiers, radios (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 4 Dec 2016 06:38:36 -0600
Correct. Plus, the immense satisfaction that comes with regular use of something you constructed to your needs. People who never do this are missing out on more than half the fun of ham radio. 73 Ro
/archives//html/Amps/2016-12/msg00056.html (8,529 bytes)

316. Re: [Amps] Stock up on tubes? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 4 Dec 2016 09:31:57 -0600
Who cares; it's go nothing to do with transceivers, you can't even get my call-sign right, and you wonder vaguely about some "gotcha" converting a lightweight Heathkit amp to an 8877, evidently not e
/archives//html/Amps/2016-12/msg00066.html (9,021 bytes)

317. Re: [Amps] Stock up on tubes? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 4 Dec 2016 12:31:34 -0600
I misread this comment; I thought it meant the same attitude was common when hams went from separates to transceivers. I must apologize for that error. It's entirely possible that attitude existed w
/archives//html/Amps/2016-12/msg00067.html (8,471 bytes)

318. Re: [Amps] Stock up on tubes? (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 4 Dec 2016 19:06:56 -0600
That sounds like a great deal to me--you're on! 73 Rob K5UJ -- ORIGINAL MESSAGE --(may be snipped) REPLY: If you will forgive me for getting your callsign wrong, I will forgive you for totally misrea
/archives//html/Amps/2016-12/msg00083.html (8,688 bytes)

319. Re: [Amps] "Conventional" current flow (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 9 Dec 2016 11:49:36 -0600
Dear Bill, I didn't know you had gotten into the fake news business. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2016-12/msg00221.html (8,314 bytes)

320. Re: [Amps] FCC Denies Expert Linears' Request for Waiver of 15 dB Rule (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 30 Dec 2016 16:37:48 -0600
I completely agree with WA3JPY. You who want this all-inclusive, let's all have a warm fuzzy because we all have ham tickets, ham radio take note: In Part 97, the FCC _requires_ licensees, who are th
/archives//html/Amps/2016-12/msg00531.html (11,642 bytes)

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