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1. [Amps] LK-500 Problem (score: 1)
Date: Mon, 29 May 2006 10:27:07 -0500 (CDT)
Sounds to me like there is something not connected properly in the 220 conversion. Remember this particular amp has 2 primaries in the transformers, 3 leads (plus a ground). Lead "A" with the single
/archives//html/Amps/2006-05/msg00487.html (7,974 bytes)

2. [Amps] LK-500 Problem (score: 1)
Date: Mon, 29 May 2006 10:38:47 -0500 (CDT)
Boy did I read that one wrong! Have you connected both primaries to the input voltage. Again Ohm meter ... My LK-500B did not have step start so I added one using resistors in each lead and a double
/archives//html/Amps/2006-05/msg00488.html (7,632 bytes)

3. [Amps] LK-500 (score: 1)
Date: Tue, 30 May 2006 09:07:05 -0500 (CDT)
Jeff: You don't have to buy anything from Harbach. Mouser has a high current DPDT relay with a 12 volt coil. Wire each side of the line (think 220, but will work at 120) through a set of normally ope
/archives//html/Amps/2006-05/msg00506.html (6,824 bytes)

4. Re: [Amps] Amps Digest, Vol 42, Issue 40 (score: 1)
Author: "Edwin Karl" <>
Date: Thu, 15 Jun 2006 15:30:24 -0500
On the question of Scotch tape .. I beleive it serves 2 purposes; a. to keep the formvar insulation on the wire from being scratched by sharp edges on a not so neatly made torroid, also to make a smo
/archives//html/Amps/2006-06/msg00297.html (24,351 bytes)

5. Re: [Amps] Amps Digest, Vol 42, Issue 67 (score: 1)
Author: "Edwin Karl" <>
Date: Mon, 26 Jun 2006 22:14:36 -0500
It occurs to me Ameritron may be trying to compensate for operators who do not 'scope their station. With an oscilloscope you can see how undercoupling the output causes the tube to flat top. That cr
/archives//html/Amps/2006-06/msg00488.html (28,037 bytes)

6. Re: [Amps] IM Distortion (score: 1)
Author: "Edwin Karl" <>
Date: Wed, 28 Jun 2006 07:16:06 -0500
Does the new graphite tubes change any of the dynamic of the discussion? i.e. 3-500Zg. It would appear the supposed extra 100 watts of plate dissipation should enable you to "Pump up the Volume". Som
/archives//html/Amps/2006-06/msg00547.html (30,211 bytes)

7. Re: [Amps] Amps Digest, Vol 43, Issue 23 (score: 1)
Author: "Edwin Karl" <>
Date: Tue, 4 Jul 2006 09:35:47 -0500
In the bandwidth sidebar regarding amplifiers, etc. I would like to make 2 points: A. Bandwidth and noise power in the receiver is directly related to the ability to get a signal out of the QRM. Now
/archives//html/Amps/2006-07/msg00185.html (25,389 bytes)

8. Re: [Amps] Amps Digest, Vol 43, Issue 25 (score: 1)
Author: "Edwin Karl" <>
Date: Tue, 4 Jul 2006 23:07:55 -0500
Re: Safety Grounding. First, the two "hot" leads; red, and black (or more correctly black and red) have single phase 240 across them. The white or neutral will have no current in this case, but still
/archives//html/Amps/2006-07/msg00198.html (11,230 bytes)

9. Re: [Amps] Amps Digest, Vol 43, Issue 70 (score: 1)
Author: "Edwin Karl" <>
Date: Tue, 18 Jul 2006 08:06:26 -0500
I have been reading the PEP discussion and where it is drifting. Here's my thoughts. First, an amplifier with output devices (notetubes or solid state) will have a certain absolute maximum output pow
/archives//html/Amps/2006-07/msg00563.html (33,747 bytes)

10. Re: [Amps] Amps Digest, Vol 44, Issue 75 (score: 1)
Author: "Edwin Karl" <>
Date: Tue, 22 Aug 2006 11:45:35 -0500
Regarding the selection of amplifiers, I have comments (everybody has an opinion ...etc) One of my considerations for an amplifier is the cost of replacement tubes. As mentioned here, unlikely that i
/archives//html/Amps/2006-08/msg00598.html (24,622 bytes)

11. Re: [Amps] Amps Digest, Vol 44, Issue 84 (score: 1)
Author: "Edwin Karl" <>
Date: Fri, 25 Aug 2006 13:31:49 -0500
Re: AL-80B Mike, first I would check the bias on the tube. It sounds like the tube is idling in the "on" position. There should be a relay that biases the tube to hard off, i.e. no plate current or a
/archives//html/Amps/2006-08/msg00659.html (16,468 bytes)

12. [Amps] PARASITICS AND fILAMENT SAG (score: 1)
Author: "Edwin Karl" <>
Date: Mon, 28 Aug 2006 09:13:53 -0500
Gentlemen It would seem that someone should call the ASPCA on this discission/argument. That's for beating a dead horse. I joined this thread several months ago to seek information regarding amplifie
/archives//html/Amps/2006-08/msg00733.html (24,255 bytes)

13. Re: [Amps] Amps Digest, Vol 45, Issue 21 (score: 1)
Author: "Edwin Karl" <>
Date: Sat, 9 Sep 2006 20:49:51 -0500
On the subject of auxiliary transmitter on ... I worked in the broadcast business for over 40 years. Mostly as a Chief or Consultant to many radio stations. Multiple TVs, etc. I only one case did we
/archives//html/Amps/2006-09/msg00160.html (24,635 bytes)

14. [Amps] Newbie Question SB-200 (score: 1)
Date: Fri, 29 Sep 2006 04:50:03 -0500 (CDT)
I used to own an SB-200. It is a fine amplifier. I also owned a TL-922A from Kenwood. In both cases failure of one or more devices on the Harbach board caused a condition similar to that which you ar
/archives//html/Amps/2006-09/msg00351.html (6,695 bytes)

15. Re: [Amps] Is Amps still in existence? (score: 1)
Author: _Administrator <>
Date: Sun, 8 Oct 2006 12:12:04 -0500
Ok folks, time to end this thread. Nothing technical here. Take your discussions to the yahoo list I'm in charge here. 73 .......Administrator (censor....err moderator) -- Sign up and get your 30GB w
/archives//html/Amps/2006-10/msg00056.html (8,033 bytes)

16. [Amps] Peak Power (score: 1)
Author: "Edwin Karl" <>
Date: Sun, 15 Oct 2006 20:34:18 -0500
It would seem we are overlooking the ability of the final ampifier (in AM) to develop the RF necessary for such high peak values mentioned on this thread. In the 60's there was a trend in AM broadcas
/archives//html/Amps/2006-10/msg00155.html (7,514 bytes)

17. [Amps] AM On a linear (score: 1)
Author: "Edwin Karl" <>
Date: Wed, 8 Nov 2006 19:31:58 -0600
We are overlloking the feed through RF from the grounded grid configuration. A portion of the driving RF will always appear in the output, thus you can never "pinch off" the carrier and get 100% modu
/archives//html/Amps/2006-11/msg00133.html (6,471 bytes)

18. [Amps] LK-550 Mod (score: 1)
Author: "Edwin Karl" <>
Date: Sat, 16 Dec 2006 20:59:14 -0600
Omega Electronics has the capacitors and coils for the mod, you will also need to tap the plate coil for 10. Very straightforward. Omega is on the internet. While you are at it, there is a second set
/archives//html/Amps/2006-12/msg00109.html (6,587 bytes)

19. [Amps] LK-550 (score: 1)
Author: "Edwin Karl" <>
Date: Wed, 20 Dec 2006 21:52:40 -0600
There is no screen in a 3-500Z. Probably a grid (control) to cathode short. I personally would not mix tube types as I want the amplifier to balance, i.e. equal power in all jugs. You no doubt could
/archives//html/Amps/2006-12/msg00184.html (6,742 bytes)

20. [Amps] Grid Current metering (score: 1)
Author: "Edwin Karl" <>
Date: Thu, 1 Feb 2007 16:16:12 -0600
Not sure about a 2100 but the SB-200/201 usually idles in the "transmit" mode with 150 or ma. due to biasing on the 572s, or so I recall... ed K0KL _______________________________________________ Amp
/archives//html/Amps/2007-02/msg00003.html (6,211 bytes)

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