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21. Re: [Amps] EIMAC vs. SED 3CPX800A7 (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Fri, 25 Aug 2006 17:37:09 -0400
One clarification...SED was not spun off of Svetlana. It is the same St. Petersburg factory, but a legal dispute over the Svetlana brand name forced the name change. I know two hams with Alpha 86 amp
/archives//html/Amps/2006-08/msg00661.html (8,597 bytes)

22. Re: [Amps] amplifier design (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Thu, 21 Sep 2006 12:38:34 -0400
I would find a 1980's vintage copy of the Radio Handbook. They are always on eB... I also agree with trying out a proven design first and then playing with it to see what changes do to the results. P
/archives//html/Amps/2006-09/msg00266.html (8,161 bytes)

23. Re: [Amps] Bad Tubes (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Fri, 29 Sep 2006 13:54:44 -0400
RF parts lists 4CX800's at $349 each so two for legal limit is $698. Eimac 8877 is $799 with good MRI pulls in the $250 range. A new 3CX1500D7 is $695 direct from Eimac. I have never been a fan of R
/archives//html/Amps/2006-09/msg00366.html (6,965 bytes)

24. Re: [Amps] What NOT to buy? (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Mon, 23 Oct 2006 12:12:42 -0400
I wouldn't specify a particular amp manufacturer to avoid. Some models are better than others, but most that have issues are easily fixed. Most Ham grade linear amplifiers are fairly solid. I think t
/archives//html/Amps/2006-10/msg00243.html (9,465 bytes)

25. Re: [Amps] More information for "What NOT to buy".. (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 24 Oct 2006 08:41:45 -0400
I wouldn't buy them from that internet place unless they were from someone that guaranteed them and has tested them. Most of them are sold as-is with comments like "they worked when they got pulled"
/archives//html/Amps/2006-10/msg00266.html (13,881 bytes)

26. Re: [Amps] 4CX1500 class AB1 vs. AB2 (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Thu, 2 Nov 2006 08:10:20 -0500
Hmmm...There seems to be some confusion here. The tubes in question are Eimac 4CX1500B tubes. According to the data sheet it lists and recommends AB2 operation for lowest IMD in RF linear service. Th
/archives//html/Amps/2006-11/msg00033.html (10,003 bytes)

27. Re: [Amps] Testing Jennings RJ11A-235 Relay (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 21 Nov 2006 20:38:23 -0500
With a hi-pot tester. Also make sure they switch when V applied to coil. Mike, W1NR I have 6 Jennings RJ11A-235 relays, how do you test them before I install them? Fred AB8AH ________________________
/archives//html/Amps/2006-11/msg00244.html (7,187 bytes)

28. Re: [Amps] HV Disc caps needed (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 19 Dec 2006 14:03:46 -0500
www.mouser.com stock no. 140-123P9-102K, $2.99 each. Mike, W1NR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-12/msg00176.html (7,198 bytes)

29. Re: [Amps] 3-500z - intermittent filament (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Fri, 09 Feb 2007 09:30:46 -0500
Pb90 (90% lead) solder is about 300 C. I have had good luck with "Sb5" alloy which is 95% tin and 5% antimony. It is not the highest of melting points at about 240 C but much higher than 60/40 at 185
/archives//html/Amps/2007-02/msg00160.html (8,765 bytes)

30. [Amps] Switching PS for filaments? (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Fri, 16 Feb 2007 13:53:43 -0500
Has anyone used a switching power supply to power the filaments of a high power RF tube? What should one look out for when using a switcher? My idea is to try a 5V 15A supply that can be adjusted nea
/archives//html/Amps/2007-02/msg00260.html (6,874 bytes)

31. Re: [Amps] Centurion problems.... (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Fri, 09 Mar 2007 14:46:33 -0500
What is the grid current? Maybe a grid-cathode short? Maybe a weak output relay? Mike, W1NR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti
/archives//html/Amps/2007-03/msg00149.html (7,961 bytes)

32. [Amps] Greenstone Tubes (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Fri, 09 Mar 2007 14:56:16 -0500
Anyone have any comments on Greenstone tubes? Quality? Durability? I assume they are Chinese made... Mike, W1NR _______________________________________________ Amps mailing list Amps@contesting.com h
/archives//html/Amps/2007-03/msg00150.html (6,085 bytes)

33. Re: [Amps] Gas arc tube Bourns 2027-15 (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Sun, 11 Mar 2007 19:51:02 -0400
Searching the Mouser WEB site for 2027-15 yields several different hits with various suffixes. Some are listed "In Stock" and available in QTY 1. Others are not-stock items that must be ordered in 10
/archives//html/Amps/2007-03/msg00161.html (7,720 bytes)

34. Re: [Amps] Gas arc tube Bourns 2027-15 (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Sun, 11 Mar 2007 19:58:34 -0400
Looking a bit closer, you want Mouser stock number 652-2027-15-B with no additional letters after it. They are stocked and available in QTY 1. The others listed are "reel" packs of 100 which are only
/archives//html/Amps/2007-03/msg00162.html (8,897 bytes)

35. Re: [Amps] Amp Supply LK500-zc tube asymmetry (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 20 Mar 2007 14:05:34 -0400
How about a bad drive coupling cap? Mike, W1NR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2007-03/msg00256.html (10,385 bytes)

36. Re: [Amps] 8877 blower requirement ? (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Thu, 05 Apr 2007 12:47:45 -0400
The 3CX1500A7/8877 lists the minimum airflow and static pressure required for adequate cooling at various power levels and altitudes. For example at the maximum 1500W dissipation level 38 CFM at .60
/archives//html/Amps/2007-04/msg00013.html (10,086 bytes)

37. Re: [Amps] Replacements for Carbon Composition Resisotrs (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Thu, 19 Apr 2007 09:08:42 -0400
Ceramic composition like the Ohmite OX and OY series available at Mouser, Newark, etc. See http://www.ohmite.com/cgi-bin/showpage.cgi?product=ox_oy_series Mike, W1NR _________________________________
/archives//html/Amps/2007-04/msg00207.html (7,950 bytes)

38. Re: [Amps] 230v wiring question (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 24 Apr 2007 15:23:58 -0400
If it's 12/2 with ground (and most Romex type cable is) a seperate ground is not required. The one in the jacket will suffice. Mike, W1NR _______________________________________________ Amps mailing
/archives//html/Amps/2007-04/msg00260.html (9,120 bytes)

39. Re: [Amps] Henry 2K (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Sun, 07 Oct 2007 08:45:41 -0400
My "original" 2k was shipped with and is still running 3-400's. I will try and get some photos to you later this afternoon. Mike, W1NR _______________________________________________ Amps mailing lis
/archives//html/Amps/2007-10/msg00073.html (6,691 bytes)

40. Re: [Amps] NEED Kilovac HC1.....Got One.... (score: 1)
Author: "Mike McCarthy, W1NR" <lists@w1nr.net>
Date: Tue, 29 Jan 2008 20:40:02 -0500
FYI: Gigavac sells relays to Hams (max 3 per year) at a discount. See http://www.gigavac.com/products/relays/ham/index.htm Mike, W1NR _______________________________________________ Amps mailing list
/archives//html/Amps/2008-01/msg00261.html (6,982 bytes)

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