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21. Re: [Amps] SB-220 6 Meter Conversion Article in April QST, (score: 1)
Author: "David Craig" <davidhcraig@verizon.net>
Date: Wed, 01 Apr 2009 00:54:51 -0400
The article was last year, by W1JJ, K1SG & UN8CG. 73 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-03/msg00563.html (7,605 bytes)

22. Re: [Amps] OT: Can someone ID this tube and its use ? (score: 1)
Author: "David Craig" <davidhcraig@verizon.net>
Date: Wed, 01 Apr 2009 19:03:18 -0400
http://lists.contesting.com/_amps/2003-06/msg00140.html might be helpful, albeit yours is Eimac. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con
/archives//html/Amps/2009-04/msg00021.html (10,360 bytes)

23. Re: [Amps] PSU rectifiers & caps (score: 1)
Author: "David Craig" <davidhcraig@verizon.net>
Date: Wed, 01 Apr 2009 23:42:05 -0400
Don't know if these will give you any advantage but 6A10-T s are 1000V PIV @ 6amp (but expensive). I almost doubled the diode "headroom" for my latest GS35b but still use 1N5408s - 8 per string for 3
/archives//html/Amps/2009-04/msg00026.html (10,776 bytes)

24. Re: [Amps] Plate voltage for GS35B (score: 1)
Author: "David Craig" <davidhcraig@verizon.net>
Date: Fri, 03 Apr 2009 11:27:13 -0400
Ulf, I run 4200-4400 VDC on the plate with no problems. All my NOS tubes hipot somewhere over 5kv (I haven't tried to max one out). A PE friend runs 4700 VDC on his 2 x GS35b amp, concensus seems to
/archives//html/Amps/2009-04/msg00042.html (7,717 bytes)

25. Re: [Amps] Help needed with: driving TITAN 425s with K3's (score: 1)
Author: "David Craig" <davidhcraig@verizon.net>
Date: Tue, 21 Apr 2009 14:04:54 -0400
Try changing the coas length between the K3 & the amp. Play around with it until you find a length that makes the K3 "happy". Same problem with Icom rigs on occassion, especially the old 746. This cu
/archives//html/Amps/2009-04/msg00185.html (10,525 bytes)

26. Re: [Amps] Doorknob Caps Needed: Background (score: 1)
Author: "David Craig" <davidhcraig@verizon.net>
Date: Thu, 28 May 2009 00:56:11 -0400
Dick, many use the stock 1000pf cap. I do too, but it makes me quezy as the RF current rating is being taxed or probably exceeded. That said, if you need a new one a 200pf 15kv would be ideal if you
/archives//html/Amps/2009-05/msg00236.html (8,588 bytes)

27. Re: [Amps] Tube choice for SB-200 on 6 meters (score: 1)
Author: "David Craig" <davidhcraig@verizon.net>
Date: Sat, 11 Jul 2009 12:42:42 -0400
I'll defer to the comments of others on the 572b insofar as stability at 50 MHz is concerned. One thing however is a virtual certainty- 572b conversions (at least SB200s) do not hold up with hard dut
/archives//html/Amps/2009-07/msg00149.html (11,929 bytes)

28. Re: [Amps] parasitic oscillation techniques (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Sun, 23 Aug 2009 23:53:38 -0400
Maybe the "moderator" won't block this one. I am tired of this old sawyou got rid of the parasitic, so to speak, and I personally agree the nicrome idea is a bad one. That said, I guess a hobbiest (n
/archives//html/Amps/2009-08/msg00428.html (11,684 bytes)

29. Re: [Amps] Sunspots gone? (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Thu, 24 Sep 2009 21:55:55 -0400
I like guts in predictions but in the end it is like reading the tea leaves. The only professional prediction using physics & observed information out there is Piktpati's [sp?] projection of a modera
/archives//html/Amps/2009-09/msg00290.html (11,065 bytes)

30. Re: [Amps] PSU design question (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Sat, 07 Nov 2009 00:07:22 -0500
This one is interesting to me for a number of reasons, not the least of which I spent a lot of time mulling over the different designs. In the end I do as Bill wrote below, using an ammeter with the
/archives//html/Amps/2009-11/msg00096.html (14,453 bytes)

31. Re: [Amps] B- questions (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Tue, 10 Nov 2009 12:10:00 -0500
Seems to me it has to read BOTH in that configuration. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-11/msg00163.html (9,050 bytes)

32. Re: [Amps] B- questions (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Tue, 10 Nov 2009 14:22:36 -0500
"So with a GG triode, a meter in the neg lead of the power supply filter caps to chassis ground, reads only plate current and not any grid current, right?" Then in this case your meter is in parallel
/archives//html/Amps/2009-11/msg00166.html (10,366 bytes)

33. Re: [Amps] QRO Parts (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Tue, 24 Nov 2009 11:10:44 -0500
My experience with "QRO Parts" was similar. My auction query was whether alternate shipping was available- the response was "Yes, you can come to Russia & pick up yourself!" Needless to say I didn't
/archives//html/Amps/2009-11/msg00258.html (12,150 bytes)

34. Re: [Amps] SB-220: 1,800 Watts Output ? (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Mon, 30 Nov 2009 02:26:52 -0500
The SB1000 had a single hole 3-500Z. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2009-11/msg00297.html (13,147 bytes)

35. [Amps] GS-31B (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Fri, 04 Dec 2009 23:18:40 -0500
Has anyone checked out / built a GS-31B amp? Based on the spec sheet and tube dimensions, they appear to be a GS-35B with an inferior anode. Not having handled a 31B I can't tell for sure, but I am b
/archives//html/Amps/2009-12/msg00119.html (7,105 bytes)

36. Re: [Amps] Russian Power Tubes (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Tue, 15 Dec 2009 19:16:50 -0500
I concur- I have one running 3875 VDC on the plate, and another one with 4400 VDC- the voltage limitations are highly under-rated for actual usable values. Re the GS-5, I looked at that one time- mig
/archives//html/Amps/2009-12/msg00355.html (10,381 bytes)

37. Re: [Amps] Alternative cooling strategies for SB-220? (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Tue, 15 Dec 2009 19:19:36 -0500
Mine never did that.... having so said, take the old fan, drill some grease holes, and put it back in. Just watch it, however, to be sure it doesn't die mid-use. Dave N3DB ___________________________
/archives//html/Amps/2009-12/msg00356.html (9,679 bytes)

38. Re: [Amps] Russian Power Tubes (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Tue, 15 Dec 2009 21:22:38 -0500
I guess empircal evidence isn't germain to this discussion.... must be flat-earth "theory." I have some PE friemds that run close to 5KV on the plate of a pair of GS35Bs on 50 MHz... again. I assume
/archives//html/Amps/2009-12/msg00364.html (10,370 bytes)

39. Re: [Amps] Russian Power Tubes (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Wed, 16 Dec 2009 14:05:38 -0500
Russian (USSR) specs are not the same as Eimac or other hi-quality manufacturers. There is, for example, not even a published figure on cathode input impedance. That said, stick to your sheet specs a
/archives//html/Amps/2009-12/msg00381.html (11,338 bytes)

40. Re: [Amps] Question about GS-35b efficiency (score: 1)
Author: "David H Craig" <davidhcraig@verizon.net>
Date: Thu, 17 Dec 2009 23:51:09 -0500
I see you found pragmatism (real-world) trumps "specs". My in-use 6m GS35b is 55% efficient, measured "old method" with 4400vdc on the plate & <150-vdc drop full-load. 57% (including power added), wi
/archives//html/Amps/2009-12/msg00417.html (9,488 bytes)

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