Amps archive search

1. Re: [Amps] Svetlana 4CX800 (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Tue, 8 Dec 2009 13:22:05 -0500

Array Solutions may have them as well. A few months ago I got a matched pair of NOS tubes for $550. They were matched and tested by Vine in the UK. 73, Dick WC1M 4CX800 ______________________________

/archives//html/Amps/2009-12/msg00233.html (8,972 bytes)

2. Re: [Amps] Life of 3CX800 tubes (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Thu, 10 Dec 2009 14:57:26 -0500

For reference, the original 3CX800 tubes in my 87A, which is going on 15 years old, are still producing full output (>2200W) into a dummy load on 160m-10m. If the 89 is anything like the 87A, which I

/archives//html/Amps/2009-12/msg00270.html (10,110 bytes)

3. Re: [Amps] Alpha 87A Alphamax upgrade (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Mon, 4 Jan 2010 12:34:36 -0500

What hard fault are you getting? 73, Dick WC1M _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps

/archives//html/Amps/2010-01/msg00018.html (9,735 bytes)

4. Re: [Amps] Alpha 87A was humming along nicely when... (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Sun, 11 Apr 2010 01:40:08 -0400

Did you see a hard fault code displayed when the amp was restarted? If not, you should dump the hard and soft fault tables using the RS-232 interface. The information there may be helpful. My guess w

/archives//html/Amps/2010-04/msg00366.html (8,069 bytes)

5. Re: [Amps] LK550 neg grid ... and bandswitch woes (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Sat, 11 Dec 2010 14:58:16 -0500

You might want to consider how the plate choke got fried in the first place. I've had that problem with an LK-550ZC. It was caused by an arc from a bad tube. I believe the tube's vacuum was compromis

/archives//html/Amps/2010-12/msg00109.html (13,151 bytes)

6. Re: [Amps] 87a Fault 9 (score: 1)

Author: Dick Green WC1M <wc1m73@gmail.com>

Date: Mon, 03 Jan 2011 14:02:52 -0500

First, I�d like to echo Paul�s comments about the 87A. Like all equipment, it needs maintenance from time to time. But I�ve been able to keep mine running for over 15 years. Alpha has always been ext

/archives//html/Amps/2011-01/msg00028.html (10,870 bytes)

7. Re: [Amps] Amp Supply LK-500ZB Upgrades? (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Sat, 19 Feb 2011 16:47:06 -0500

I have an LK-550ZC, and while I think the amps are similar, I'm not familiar with the specific differences. That said, I can offer the following: 1. The problem with the fan system is that it doesn't

/archives//html/Amps/2011-02/msg00143.html (11,318 bytes)

8. Re: [Amps] 87 a query re align motors? (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Sat, 26 Mar 2011 14:20:51 -0400

Does this happen on all bands? Did this happen suddenly? Was the amp working OK before that? Was there any indication of a problem before the amp got into this state? If it happens on one or two band

/archives//html/Amps/2011-03/msg00208.html (8,689 bytes)

9. Re: [Amps] 87 a query re align motors? (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Sat, 26 Mar 2011 14:46:32 -0400

Replacement of the PIN diodes, by itself, would not have cleared the segment memories. I guess RF Concepts could have accidentally wiped the memories when doing diagnostics before or after the replac

/archives//html/Amps/2011-03/msg00209.html (13,038 bytes)

10. Re: [Amps] 4 wire 240VAC service? What to do now? (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Mon, 4 Apr 2011 13:49:48 -0400

Yes, and the neutral and ground must be isolated in any subpanels as well. However, there's one exception: if the subpanel is more than a certain distance from the main panel (not sure how far), such

/archives//html/Amps/2011-04/msg00113.html (10,481 bytes)

11. Re: [Amps] Alpha 87a famous Fault 9 (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Fri, 16 Dec 2011 16:49:16 -0500

Charles, We had some correspondence about this back in January. As you may recall, my amp had similar symptoms, though sometimes I got fault 8 or 11 instead of fault 9. I determined that one of the e

/archives//html/Amps/2011-12/msg00123.html (9,973 bytes)

12. Re: [Amps] LK 550-ZC (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Thu, 15 Mar 2012 17:12:55 -0400

As far as I know, there was no individual manual for the ZC. I think the "400/500 Series" manual was intended to cover all the variations in both series. I don't recall exactly what set the ZC apart

/archives//html/Amps/2012-03/msg00185.html (9,511 bytes)

13. Re: [Amps] LK 550-ZC (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Sat, 17 Mar 2012 01:16:18 -0400

Guess I have a real late one: it has the fan speed temperature sensor. The stock fan speed is too slow in low-speed mode, so the fan cycles low-high constantly. And it's like a freight train at high-

/archives//html/Amps/2012-03/msg00192.html (13,426 bytes)

14. Re: [Amps] LK 550-ZC (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Sat, 17 Mar 2012 14:13:37 -0400

I use mostly CW, with varying lengths of transmission. But there's a big difference between the modes I use for operating and what I did to test the tube temperature before and after the mod. I trans

/archives//html/Amps/2012-03/msg00199.html (12,393 bytes)

15. Re: [Amps] Amp Supply LK500ZC info needed (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Tue, 24 Apr 2012 15:56:51 -0400

Here's a version: http://bama.edebris.com/manuals/ampsuply/lk450-550 73, Dick WC1M _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/ma

/archives//html/Amps/2012-04/msg00229.html (7,636 bytes)

16. Re: [Amps] soldering vs crimping (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Wed, 2 May 2012 12:51:20 -0400

I'm with Carl on this one. Actually, the crimp N-connectors I use have center pins designed to be crimped *and* soldered -- there's a little hole in the side for soldering. I've found that there's so

/archives//html/Amps/2012-05/msg00063.html (17,363 bytes)

17. Re: [Amps] Fwd: Re: soldering vs crimping (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Wed, 2 May 2012 15:51:25 -0400

Wise words. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps

/archives//html/Amps/2012-05/msg00082.html (10,895 bytes)

18. Re: [Amps] Fwd: Re: soldering vs crimping (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Wed, 2 May 2012 15:51:25 -0400

I do that too. I believe I solder the braid about as well as anyone, and I use the good Amphenol silver connectors, etc., so there's no problem with the solder sticking. I said it's tricky to contro

/archives//html/Amps/2012-05/msg00083.html (10,473 bytes)

19. Re: [Amps] brittle shields? and soldering vs crimping (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Wed, 2 May 2012 15:55:44 -0400

Allow me to clarify. The joint becomes brittle, not the material. I think what happens is that the solder penetrates the entire braid, from surface to dielectric, fixing the strands in place. As the

/archives//html/Amps/2012-05/msg00084.html (13,233 bytes)

20. Re: [Amps] soldering vs crimping (score: 1)

Author: "Dick Green WC1M" <wc1m73@gmail.com>

Date: Thu, 3 May 2012 13:05:58 -0400

Right, and I'm not sure there's a better alternative to using the hole. The only other way to solder the center pin is to leave a small space between the opening of the pin and the dielectric, heat

/archives//html/Amps/2012-05/msg00119.html (11,634 bytes)