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381. Re: [Amps] AL-811 Tube Swap (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 28 Apr 2021 18:09:38 -0500
What are you expecting to achieve by changing the tube type? Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf
/archives//html/Amps/2021-04/msg00103.html (6,662 bytes)

382. [Amps] Vacuum Relay Question (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 26 Jul 2021 05:08:24 -0500
I would not use a vacuum relay in a matching network for a 1/4 w. antenna. That's a low v. high current setup calling for open frame contactors or at least large open relays. Perhaps this information
/archives//html/Amps/2021-07/msg00071.html (6,597 bytes)

383. Re: [Amps] Vacuum Relay Question (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 26 Jul 2021 10:54:06 -0500
A 1/4 w. monopole load is a low Z load; that means high current, low voltage, i.e. it is not a voltage fed antenna. Therefore there isn't high voltage involved. You can operate without a vacuum relay
/archives//html/Amps/2021-07/msg00073.html (7,546 bytes)

384. Re: [Amps] Vacuum Relay Question (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 27 Jul 2021 06:23:02 -0500
Sure you can use vac. relays if they can handle the current. My point was that they're not necessary and since they are usually expensive, why use them when open large surface area contactors can be
/archives//html/Amps/2021-07/msg00080.html (7,995 bytes)

385. [Amps] SB-220 Output Network (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Fri, 13 Aug 2021 10:02:51 -0500
SB220s are designed for light duty cycles. SSB and CW. It is probably obvious to you by now that they were not made for full strap at 100% d.c. RTTY for any length of transmit time. You don't need h
/archives//html/Amps/2021-08/msg00029.html (9,093 bytes)

386. Re: [Amps] 572B/T160L tube class C (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 21 Aug 2021 10:44:51 -0500
The Cetron plant used to be about 2 miles from my house, in nearby Geneva IL. It was torn down a few years ago. A few years before I moved here in 1992 they had ceased production, but local hams told
/archives//html/Amps/2021-08/msg00050.html (7,763 bytes)

387. Re: [Amps] 572B/T160L tube class C (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sat, 21 Aug 2021 16:03:44 -0500
I wish I could have seen inside that plant when it was in operation. I guess no one ever took any photos, at least I have not seen any. Rob K5UJ _______________________________________________ Amps m
/archives//html/Amps/2021-08/msg00053.html (8,126 bytes)

388. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 11 Oct 2021 04:49:48 -0500
Why do some of you guys want to jack up the plate v. on your 3-500s? The power difference won't be noticed and you'll create a cascade of problems. You still have the same plate dissipation and plate
/archives//html/Amps/2021-10/msg00025.html (7,669 bytes)

389. Re: [Amps] Hole punches (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 11 Oct 2021 05:04:26 -0500
I have sets of punches here I've picked up at hamfests over the years. Makes clean holes in steel so much easier but be sure to use cutting oil so they don't get dull. If you've ever watched pros wor
/archives//html/Amps/2021-10/msg00027.html (8,104 bytes)

390. Re: [Amps] Need Smarter Than I Am Help. (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 11 Oct 2021 05:05:53 -0500
It's tube type dependent. Not all tubes work the same way. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
/archives//html/Amps/2021-10/msg00028.html (7,913 bytes)

391. [Amps] 1:9 un-un for grid driven tetrode (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 24 Oct 2021 06:19:24 -0500
The unun is (my opinion) a waste of time. Just connect your grid input network, usually a pi network for tetrodes, to the grid and design it to do all the impedance transformation. It can be band swi
/archives//html/Amps/2021-10/msg00083.html (7,737 bytes)

392. Re: [Amps] 1:9 un-un for grid driven tetrode (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 24 Oct 2021 10:21:33 -0500
Obviously? This is a ham. No telling what a ham will try. I drive a 4-1000 grid with a grid leak bias resistor all the time. Separate screen v. supply Why would a ham want a tube with 15 KW anode dis
/archives//html/Amps/2021-10/msg00085.html (7,767 bytes)

393. Re: [Amps] 1:9 un-un for grid driven tetrode (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Sun, 24 Oct 2021 11:26:55 -0500
Okay, thinking about this some more (rainy day here). Firstly, I apologize for sneering at this idea and those trying it. More information is needed for anyone to help in my opinion. 1. What is the t
/archives//html/Amps/2021-10/msg00086.html (8,757 bytes)

394. [Amps] QRO HF2000 plate choke (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 2 Nov 2021 05:03:46 -0500
Please tell us what these problems are exactly. Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2021-11/msg00001.html (6,523 bytes)

395. Re: [Amps] QRO HF2000 plate choke (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 2 Nov 2021 10:10:17 -0500
Okay it looks as if you'll have to modify your choke. Here's a useful guide on how to do that. https://www.w8ji.com/rf_plate_choke.htm You can get a pretty good look at what the stock choke looked li
/archives//html/Amps/2021-11/msg00004.html (8,085 bytes)

396. Re: [Amps] Triode Amps (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 6 Dec 2021 05:00:41 -0600
That's not a problem. Plenty of parts out there that can work. Lots of AM rigs swing up to at least 4 KV DC on positive modulation. Then the peak of each RF cycle goes higher. A couple guys, one now
/archives//html/Amps/2021-12/msg00052.html (8,652 bytes)

397. [Amps] Triode Amps (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 7 Dec 2021 06:28:55 -0600
John, Firstly, I botched Penn Yan Bob's call sign. It was W2ZM. He went SK about 18 months ago. Covid maybe, not sure. https://forums.qrz.com/index.php?threads/w2zm.712121/ Some photo's of Bob's gear
/archives//html/Amps/2021-12/msg00058.html (7,984 bytes)

398. [Amps] AL82 pi network C2 failure (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Tue, 7 Dec 2021 20:30:14 -0600
My guess is that you are not sequencing your station, or you are, but there's a timing problem. When you run high power you have to have a sequencer so everything that changes state can do so and pul
/archives//html/Amps/2021-12/msg00061.html (7,476 bytes)

399. Re: [Amps] AL82 pi network C2 failure (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Wed, 8 Dec 2021 09:19:26 -0600
Carbon tracks. If you find any they have to be completely removed. Dremel works well. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
/archives//html/Amps/2021-12/msg00065.html (7,788 bytes)

400. Re: [Amps] DX-100B CW Keying (score: 1)
Author: Rob Atkinson <ranchorobbo@gmail.com>
Date: Mon, 3 Jan 2022 07:32:21 -0600
I'd post your question here: https://antiqueradios.com/forums/viewforum.php?f=5 The reason is that you need to communicate with vintage radio people. I've never owned a DX100 but my experience with c
/archives//html/Amps/2022-01/msg00018.html (7,408 bytes)

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