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1. Re: [Amps] Amplifier output power delivery .... (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 26 Sep 2016 14:06:55 +0000 (UTC)
Related to this, is there a significant output difference between a TL922 and a Heathkit SB-220/221? Will these two-tube 3-500Z amplifiers product the same output at the same exciter power? 73, Cathy
/archives//html/Amps/2016-09/msg00122.html (8,988 bytes)

2. Re: [Amps] MFJ-(AMERITRON) ROLLER INDUCTOR? (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Thu, 29 Sep 2016 14:42:24 +0000 (UTC)
I have been happy with the performance of the roller inductor in my ATR-30. While I can see that contacts may hold up better long-term in a switched inductor, the performance of the rollers seems to
/archives//html/Amps/2016-09/msg00135.html (8,217 bytes)

3. [Amps] SB-220 question (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Sat, 15 Oct 2016 15:41:28 +0000 (UTC)
I've just bought a Heathkit SB-200. Superficial inspections looks good; no sign of burned contacts, corrosion, etc. Transformers appear fine. There do not appear to be any Harbach board modifications
/archives//html/Amps/2016-10/msg00061.html (8,094 bytes)

4. Re: [Amps] Ampleon BLF189XR 1900W LDMOS transistor (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Thu, 20 Oct 2016 15:17:50 +0000 (UTC)
Broadcast is really the wrong comparison for all the reasons that Jim gives below. How does the military handle this in applications that require power and frequency agility? While they don't have ou
/archives//html/Amps/2016-10/msg00099.html (9,401 bytes)

5. [Amps] SB-220 Harbach meter board - blown meter diodes (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 24 Oct 2016 23:45:38 +0000 (UTC)
In the continuing saga of the "new" SB-220... I've opened everything up and it looks good to me. No burned spots, signs of arcing, etc. A previous owner has already installed the Harbach soft-key and
/archives//html/Amps/2016-10/msg00110.html (7,585 bytes)

6. Re: [Amps] reference direction of current flow in screen grids (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Fri, 28 Oct 2016 20:49:42 +0000 (UTC)
More than a hundred years ago. The "scientist [who] guessed wrong" about polarity was Ben Franklin! 73, Cathy _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2016-10/msg00135.html (7,473 bytes)

7. [Amps] SB-220 HV meter on zero (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Tue, 1 Nov 2016 00:08:28 +0000 (UTC)
I have replaced the back-to-back meter diodes on the Harbach diode meter board (which came with the amp pre-installed, and is not the latest version), replaced the capacitor block, installed a 10 ohm
/archives//html/Amps/2016-11/msg00005.html (8,687 bytes)

8. Re: [Amps] SB-220 HV meter on zero (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 31 Oct 2016 19:10:01 -0700
OK, found schematics (thanks Bob W1ICW). Looking at the glorified voltage divider, I'm guessing it's just an open resistor on the meter board. I'll have a closer look at it later this week. Hoping th
/archives//html/Amps/2016-11/msg00006.html (7,288 bytes)

9. [Amps] SB-220 saga continues (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Thu, 3 Nov 2016 12:39:51 +0000 (UTC)
Thanks to all who gave advice, links to documentation, etc. The meter reads 1400 ohms when disconnected from the side meter board and connected to an ohmmeter, and that puts the meter at half scale.
/archives//html/Amps/2016-11/msg00024.html (8,235 bytes)

10. Re: [Amps] SB-220 fixed (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Thu, 3 Nov 2016 22:49:48 +0000 (UTC)
As you might expect, this problem turned out to be trivial once found. The problem was that the black B- wire running from the cap board to the diode/mixer board was hanging by a thread. Heath used s
/archives//html/Amps/2016-11/msg00025.html (7,443 bytes)

11. Re: [Amps] Glitch resistor (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 14 Nov 2016 06:47:41 -0800
The recommended resistor is 10 ohms 20 watts. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2016-11/msg00040.html (7,344 bytes)

12. Re: [Amps] Glitch resistor (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Tue, 15 Nov 2016 08:34:59 -0800
That's right. The glitch resistor is designed to limit current long enough for the fuse/breaker to trip. Cathy N5WVR _______________________________________________ Amps mailing list Amps@contesting.
/archives//html/Amps/2016-11/msg00050.html (7,716 bytes)

13. Re: [Amps] "Conventional" current flow (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Sat, 19 Nov 2016 21:15:19 +0000 (UTC)
Anyone care to argue that if Ben Franklin had guessed the other way about which substance had the negative charge (which meant we would have had an electron defined as holding a positive charge), tha
/archives//html/Amps/2016-11/msg00066.html (10,675 bytes)

14. Re: [Amps] "Conventional" current flow (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Sat, 19 Nov 2016 13:49:41 -0800
Thanks, I must have missed that. More reading to do. :-) 73, Cathy N5W B R _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/li
/archives//html/Amps/2016-11/msg00068.html (8,315 bytes)

15. Re: [Amps] "Conventional" current flow (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 21 Nov 2016 13:22:01 +0000 (UTC)
The speed of light. 73, Cathy N5WVR Subject: Re: [Amps] "Conventional" current flow To: "Charles H" <k4vud@hotmail.com>, "Jim Garland" <4cx250b@miamioh.edu>, amps@contesting.com Date: Monday, Novembe
/archives//html/Amps/2016-11/msg00092.html (9,035 bytes)

16. Re: [Amps] "Conventional" current flow (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 21 Nov 2016 16:06:06 +0000 (UTC)
Bill, I'm just repeating what I've seen stated by physicists over decades. I've never seen any hint that gravity waves can travel faster than light. Mainstream theory is that all forces are carried b
/archives//html/Amps/2016-11/msg00095.html (10,345 bytes)

17. Re: [Amps] "Conventional" current flow (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 21 Nov 2016 16:12:38 +0000 (UTC)
Excellent, experiments trump theory any day! 73, Cathy N5WVR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2016-11/msg00097.html (9,106 bytes)

18. Re: [Amps] "Conventional" current flow (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 21 Nov 2016 08:27:37 -0800
And the best summary I've seen of our confusion about the fundamental forces: https://m.xkcd.com/1489/ Be sure click on the alt text link and get the punchline! 73, Cathy N5WVR ______________________
/archives//html/Amps/2016-11/msg00098.html (8,891 bytes)

19. Re: [Amps] "Conventional" current flow (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Mon, 21 Nov 2016 08:46:42 -0800
And that's evidence that physicists understand this stuff very, very well. Their math models correctly predict just about everything observed. The one big gap remains quantum gravity, but that has no
/archives//html/Amps/2016-11/msg00101.html (9,260 bytes)

20. [Amps] SB-220 update & gettering (score: 1)
Author: Catherine James <catherine.james@att.net>
Date: Sat, 26 Nov 2016 15:20:54 +0000 (UTC)
Quick update on the SB-220: After getting the HV supply working, I was still having trouble getting RF out. The relay wouldn't key via the TS-590S, and when I tried to key it by directly shorting the
/archives//html/Amps/2016-11/msg00122.html (8,179 bytes)

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