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21. Re: [Amps] New SB-200 owner (score: 1): Author: "Jim Tonne" <tonne@comcast.net>; Date: Thu, 27 Sep 2007 09:32:01 -0400; SPACE CADETS - VERSION 2 If you didn't hear W2OY, you missed a one-of-a-kind. Actually, he said, "CQ CQ CQ. No kids, no lids, no school bus riders or space cadets. No kings, no queens, no jacks. Thi; /archives//html/Amps/2007-09/msg00390.html (9,531 bytes)
22. Re: [Amps] New SB-200 owner (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 27 Sep 2007 15:42:14 +0200 (CEST); scratch for 6M? Ive not seen any REAL verified IMD numbers published for any Russian tubes except maybe the 4CX800 and have hesitated in even trying one.< Do you mean if buying a new tube, a used tub; /archives//html/Amps/2007-09/msg00392.html (8,976 bytes)
23. Re: [Amps] New SB-200 owner (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 27 Sep 2007 09:43:08 -0400; Which method of testing do you use and did you read Toms recent post? There is a huge difference between true real world IMD and the advertising departments way of rating it. Carl KM1H ______________; /archives//html/Amps/2007-09/msg00393.html (10,217 bytes)
24. Re: [Amps] New SB-200 owner (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 14:59:30 +0100; My driver ran around -55dBc IMD3 and I never tried to measure IMD5, it was off the screen. I use dBc to mean referenced to a single tone (assuming that's what you mean by 'method of testing'). Steve; /archives//html/Amps/2007-09/msg00398.html (10,660 bytes)
25. Re: [Amps] New SB-200 owner (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 09:59:15 -0400; Probably not overall, but I like to keep the harmonics down in the design as much as possible. The filters would probably do as good a job. Considering I'm close to a lot of homes using off the air; /archives//html/Amps/2007-09/msg00400.html (9,974 bytes)
26. Re: [Amps] New SB-200 owner (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 27 Sep 2007 16:03:30 +0200 (CEST); all done so at 250-300W/tube. The STC data sheet for 4CX250B gives IMD figures under the typical operating conditions. At 2kV, 325W pep output they give IMD3 -30dBc and IMD5 -50dBc.< They can do even; /archives//html/Amps/2007-09/msg00401.html (9,062 bytes)
27. Re: [Amps] New SB-200 owner (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 27 Sep 2007 10:08:05 -0400; I mean brand new, never mind the source. Most homebrewers couldnt even pronounce Pappenfus much less follow along. The stringent regulation is the rub. Ians kit isnt cheap either. I saw a partially; /archives//html/Amps/2007-09/msg00402.html (10,815 bytes)
28. Re: [Amps] New SB-200 owner (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 27 Sep 2007 10:17:08 -0400; Try the 2 tone method which was the way I was taught many years ago when proofing military equipment. Both are acceptable as long as you are aware of the differences and can reference one to the othe; /archives//html/Amps/2007-09/msg00404.html (11,470 bytes)
29. Re: [Amps] New SB-200 owner (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 15:27:41 +0100; I'm sorry if we ended up at cross purposes. I was talking about 2 tone measurements - just like when I was designing mil gear. Steve _______________________________________________ Amps mailing list; /archives//html/Amps/2007-09/msg00405.html (11,889 bytes)
30. Re: [Amps] New SB-200 owner (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 15:35:00 +0100; It needn't be. If you stay simple, a dropper from the anode supply with an uncomplicated active shunt regulator costs about a pack of beer. Regulation is more than adequate. I begrudge wasting 30W as; /archives//html/Amps/2007-09/msg00406.html (8,830 bytes)
31. Re: [Amps] New SB-200 owner (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 27 Sep 2007 10:40:33 -0400; In that case I suggest that you recheck your measurement calibration as Eimac references to a single tone which gives an inflated result. Please read Toms posting from this morning, it explains in d; /archives//html/Amps/2007-09/msg00407.html (11,783 bytes)
32. Re: [Amps] New SB-200 owner (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 27 Sep 2007 10:47:14 -0400; I wish Ian was back from holiday. He went thru this in much detail back when he was designing his regulator boards. However, dropping thru any high impedence is far from ideal be it via tubes, resis; /archives//html/Amps/2007-09/msg00408.html (9,266 bytes)
33. Re: [Amps] New SB-200 owner (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 16:07:32 +0100; There were no problems with the measurements, and I'm familiar with what Tom was saying. I've not seen any figures from Eimac giving IMD for 4CX250s - the data sheet I referenced was from STC, who ma; /archives//html/Amps/2007-09/msg00409.html (10,212 bytes)
34. Re: [Amps] New SB-200 owner (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 16:15:22 +0100; OK. I'll ask Ian to correct me next time we share a beer. The way I see it, if the shunt regulator is doing its job right, then the dropper is of little importance. I'll also leave it at that. Steve; /archives//html/Amps/2007-09/msg00410.html (9,957 bytes)
35. Re: [Amps] New SB-200 owner (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Sep 2007 16:45:18 +0100; Perhaps I should have been more careful with words. By 'adequate' I meant good enough that it wasn't the predominant factor in IMD performance - in effect, giving the same results as John and Ian's r; /archives//html/Amps/2007-09/msg00411.html (8,987 bytes)
36. Re: [Amps] New SB-200 owner (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 27 Sep 2007 17:59:10 +0200 (CEST); Like Carl and Steve, I've been doing RF engineering for a living for over forty years now. It sems to me that sometimes, a badly engineered design gets thrust into production because management say i; /archives//html/Amps/2007-09/msg00413.html (9,051 bytes)
37. [Amps] New SB-200 owner (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 27 Sep 2007 18:02:15 +0200 (CEST); But if the transformer comes for free because you already have it... 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m; /archives//html/Amps/2007-09/msg00414.html (8,037 bytes)
38. Re: [Amps] New SB-200 owner (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 12:38:12 -0400; Gain? GG? I'd probably use them grid driven. The whole post was a question was a question as to whether any or all of these tubes would work, or be suitable, not a recomendation. Collins sure liked; /archives//html/Amps/2007-09/msg00416.html (13,084 bytes)
39. Re: [Amps] New SB-200 owner (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 27 Sep 2007 20:43:35 +0200 (CEST); K1KP tells me: is fed back to the driver cathode...< Tnx Tony. sri, my mistake. Pappenfus suggests that super cathode driven operation works well with the 4CX1000 and the 4CX250, allowing very good I; /archives//html/Amps/2007-09/msg00419.html (8,552 bytes)
40. Re: [Amps] New SB-200 owner (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 27 Sep 2007 17:48:02 -0400; I dont follow your statement Peter or is it a language problem again? (; Tom repeatedly bashes the super cathode circuit and Bill Orr in particular. Yet you say it suggests excellent IMD re: Pappenfu; /archives//html/Amps/2007-09/msg00432.html (9,158 bytes)

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