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21. [Amps] HV transformer buzzing!! Help Please (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sat, 9 Jun 2007 23:14:23 -0700
I just finished tearing down and rebuilding a HV/LV supply for a Globe King 500A. Galvanized the chassis and repainted all the xfmrs. Looks great, works great BUT the supply is buzzing quite loudly.
/archives//html/Amps/2007-06/msg00048.html (7,889 bytes)

22. [Amps] Great Help and Comments on XFMR BUZZING ISSUE. THANK YOU (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sun, 10 Jun 2007 17:36:44 -0700
Thanks for the comments. I have a rather modest collection of 50's and 60's equipment here. I just have not run into this particular problem before. Think it is solvable. On the power supply, it is c
/archives//html/Amps/2007-06/msg00060.html (7,165 bytes)

23. [Amps] Looking for a Couplate. Can you help? (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sun, 8 Jul 2007 11:47:28 -0700
I am just finishing the rebuild of an AM/CW 4-250A final amp w/AM modulator and need one Cetralab Couplate to complete the job. The one I need is a PC-81 unit. Of course I will buy it if you have one
/archives//html/Amps/2007-07/msg00090.html (6,991 bytes)

24. [Amps] I need a COUPLATE (not a couplet...sorry!!) (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sun, 8 Jul 2007 11:54:48 -0700
I am just finishing the rebuild of an AM/CW 4-250A final amp w/AM modulator and need one Cetralab Couplate to complete the job. The one I need is a PC-81 unit. Of course I will buy it if you have one
/archives//html/Amps/2007-07/msg00091.html (6,638 bytes)

25. Re: [Amps] LK 500 ZA bandswitch (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Thu, 25 Oct 2007 15:08:27 -0700
Dave. I have a new tuning capacitor for the LK-550/500 series (both the tube and three tube model use the same plate tuning capacitor) I purchased a long time ago and if you can use it the price is $
/archives//html/Amps/2007-10/msg00243.html (9,479 bytes)

26. Re: [Amps] Considering an Alpha 76PA (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Wed, 31 Oct 2007 17:17:02 -0700
If you go to the Alpha website you can learn about the mods for the greater output on the 76 models or they used to do it for a price. Most of the 76's were modified for higher output power years ago
/archives//html/Amps/2007-10/msg00298.html (17,525 bytes)

27. Re: [Amps] Testing 8874s (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Thu, 1 Nov 2007 21:04:46 -0700
Karls advice is very close to how Alpha recommends checking individual tubes. They suggest one at a time and simply apply a small amount of drive 10-20 watts into a single tube and compare with a goo
/archives//html/Amps/2007-11/msg00013.html (11,274 bytes)

28. [Amps] LK450,500 or 550 series new Plate tuning capacitors for sale (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Fri, 7 Dec 2007 23:41:51 -0800
I have two of the Plate Tuning Capacitors designed for any of the above with slightly higher voltage ratings but same capacitance which I had made by a commercial capacitor manufacturer sometime ago.
/archives//html/Amps/2007-12/msg00058.html (7,316 bytes)

29. [Amps] plate tuning cap fs for LK400-500 series (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sun, 9 Mar 2008 23:59:29 -0700
Have custom made plate tuning capacitor fits the LK400-500 series $50.00 plus shipping. Van, K7VS -- I am using the free version of SPAMfighter for private users. It has removed 771 spam emails to da
/archives//html/Amps/2008-03/msg00108.html (6,653 bytes)

30. [Amps] Heath SB1000 issue (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sat, 22 Mar 2008 14:36:14 -0700
Plate voltage fine, key xmt relay and have about 50 ma. resting current. Apply 10 watts drive and the 3-500Z (which looks new!) the plate begins turning cherry red. Didn't have another 3-500Z emiac (
/archives//html/Amps/2008-03/msg00209.html (6,965 bytes)

31. Re: [Amps] SB-1000 (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Fri, 29 Aug 2008 08:28:08 -0700
I have one that exhibits the same characteristics. -- I am using the free version of SPAMfighter for private users. It has removed 1392 spam emails to date. Paying users do not have this message in t
/archives//html/Amps/2008-08/msg00154.html (9,605 bytes)

32. [Amps] I have unbuilt SB-220 complete anyone interested? (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sat, 14 Feb 2009 22:18:06 -0800
I looked for the kit on ebay. Assume that was where it was offered but didn't find it! I have one for sale. If a collector is interested. Van, K7VS -- I am using the free version of SPAMfighter. We a
/archives//html/Amps/2009-02/msg00462.html (8,711 bytes)

33. Re: [Amps] Fans PABST WAS A BEER ???? (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Thu, 5 Mar 2009 18:44:37 -0800
I HAVE A LARGE 2 FOOT BY 3.5 FOOT POSTER FEATURING PABST "BLUE RIBBON" BEER (WHO REMEMBERS THAT LOGO???) THAT PICTURES A GUY SMOKING HIS PIPE TUNING A NC173 OR 183 WITH WHAT MIGHT PROPRORT TO BE A GL
/archives//html/Amps/2009-03/msg00197.html (13,008 bytes)

34. [Amps] SB-1000 tuning question (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Wed, 22 Apr 2009 08:42:12 -0700
Can anyone tell me why the SB-1000 does not follow the 80 meter band tuning range? Only band it is significantly off on. When resonance achieved on the 80/75 meter band the tuning knob is way off to
/archives//html/Amps/2009-04/msg00198.html (6,847 bytes)

35. [Amps] further info on my sb-1000 problem (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Wed, 22 Apr 2009 09:59:46 -0700
capacitor is properly aligned. All tank parts seem to be just fine. Tune up is into a 50 ohm non-reactive dummy load. On the other bands from 160 thru 10 meters the tuning dial seems to be in the bal
/archives//html/Amps/2009-04/msg00200.html (7,552 bytes)

36. [Amps] MY SB-1000 Tuning Problem RESULTS (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Thu, 23 Apr 2009 08:38:34 -0700
Thanks for all the comments. Amazing how many thoughts I received. Final results seem to suggest they simply tune up on 80 meters way off the 80 meter tune position. And not to worry. My gut feeling
/archives//html/Amps/2009-04/msg00259.html (8,628 bytes)

37. [Amps] dumb query about fuses (maybe!) (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Tue, 12 May 2009 13:05:46 -0700
I know ohms law so don't need the math. Just a very specific question regarding fuses used in an amplifier on the AC side. My amp requires 15 amp fuses if using 125V and requires 10 amp fuses for 220
/archives//html/Amps/2009-05/msg00061.html (7,862 bytes)

38. [Amps] THANK YOU!!! Re: dumb query about fuses (maybe!) (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Tue, 12 May 2009 15:01:54 -0700
That's what I kinda thought but never confirmed with some accurate information. 73 Van -- I am using the free version of SPAMfighter. We are a community of 6 million users fighting spam. SPAMfighter
/archives//html/Amps/2009-05/msg00064.html (8,060 bytes)

39. [Amps] NEEDED 3 knobs for Globe King 500A (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sun, 12 Jul 2009 13:38:03 -0700
I have completely restored a Globe King 500A (go to QRZ.COM and click on pix in upper right hand corner to see it). I need one knob with plastic pointer and two of the larger knobs to complete the pr
/archives//html/Amps/2009-07/msg00160.html (6,822 bytes)

40. [Amps] Peter Dahl XFMR question (I Have one!) (score: 1)
Author: "Van K7VS" <wa7fab@cdsnet.net>
Date: Sun, 18 Oct 2009 21:57:33 -0700
My Goodness! I just picked up a new old stock Peter Dahl XFMR. Based on what I know, it probably was built around 2002-or 3. It is tapped to supply 3KV, 4KV, 5KV and 6KV at .9 amps. The input side gi
/archives//html/Amps/2009-10/msg00251.html (7,638 bytes)


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