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Total 562 documents matching your query.

21. Re: [Amps] HD HF amplifier recommendations (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 09 Feb 2012 02:46:08 -0500
Likewise. Being retired my budget limits me more than anything else and the one acre size of my lot comes next. Fortunately when they rezoned, a letter to the zoning commission resulted in Ham Radio
/archives//html/Amps/2012-02/msg00068.html (12,866 bytes)

22. Re: [Amps] Different amp recommendations (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 09 Feb 2012 15:06:30 -0500
My voice takes a little processing, *very little processing* other wise it sounds harsh because it has a very high peak to average, but it probably puts the duty cycle at 30% or less where most voice
/archives//html/Amps/2012-02/msg00081.html (9,897 bytes)

23. Re: [Amps] 3-500z amp homebrew question (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 12 Feb 2012 17:45:30 -0500
We all have/had to start some where and asking questions is a good place to start. It's where you learn to keep one hand in your pocket and don't wear rings, watches, neck chains, or other jewelry wh
/archives//html/Amps/2012-02/msg00112.html (9,018 bytes)

24. Re: [Amps] 3-500z amp homebrew question (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 12 Feb 2012 19:31:52 -0500
Thanks, that's one of the versions, but not nearly as colorful as the one we had in the shop. <:-)) 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.c
/archives//html/Amps/2012-02/msg00114.html (10,953 bytes)

25. Re: [Amps] Fw: Source for plate xfrmer (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 14 Feb 2012 14:02:18 -0500
I put in a new kitchen range. The old one had a 3 wire feed. The new one, or course had 3 wires plus ground. A 3 wire outlet plus a ground will work, as long as you don't have to get it inspected. Mo
/archives//html/Amps/2012-02/msg00159.html (14,800 bytes)

26. Re: [Amps] Source for plate xfrmer (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 17 Feb 2012 02:37:42 -0500
If you've ever gone dove hunting with a 12 ga the howitzer begins to sound appropriate. Bout 2 25# bags of shot, per shot. Things are darn near as hard to hit as Timber Doodles. 73 Roger (K8RI) _____
/archives//html/Amps/2012-02/msg00211.html (8,600 bytes)

27. Re: [Amps] URGENT - suggested prices for 4CX5000A , SK-300 in Europe? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 21 Feb 2012 16:52:03 -0500
I would *guess* (I've not use any 4CX5000s but based on other tubes that are roughly in the same power range) used and in good shape with full emission would be some where between $300 and $400 USD e
/archives//html/Amps/2012-02/msg00241.html (8,112 bytes)

28. Re: [Amps] Alpha (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 24 Feb 2012 01:06:04 -0500
I'm no expert and not knowledgeable on the 89, but: #1 You need to know a lot more about it! If it's nearby and you can pick it up would it be possible to inspect it and test it at its location. IE,
/archives//html/Amps/2012-02/msg00252.html (8,629 bytes)

29. Re: [Amps] 833A/GU-48 x4 Amp support (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 27 Feb 2012 15:34:46 -0500
The GU-81 is, or was, very popular in Europe, particularly running a pair of them. I think you'll find it's a Pentode, not a Tetrode. Of course it still requires the same power supplies as a Tetrode
/archives//html/Amps/2012-02/msg00294.html (9,754 bytes)

30. Re: [Amps] 4 x Glass Glowing tubes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 27 Feb 2012 21:23:43 -0500
I think the edges of those suppressors should probably be smoothed, or get a pair of metal shears without serrated edges. I use a *lot* of that square steel tubing too.<:-)) I have two fixtures out i
/archives//html/Amps/2012-02/msg00309.html (10,986 bytes)

31. Re: [Amps] 4 x GU-81 Grounded Grid Penthodes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 28 Feb 2012 18:50:26 -0500
As the suppressor grid is normally grounded and serves as a shield to prevent secondary emission, how would this affect running the tube in grounded grid...if at all? I would think it would tend to l
/archives//html/Amps/2012-02/msg00328.html (10,088 bytes)

32. Re: [Amps] 4 x Glass Glowing tubes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 28 Feb 2012 19:06:46 -0500
3 KW out, no fan, and this is with a pair of tubes rated for 450 watts dissipation each or 600 watts momentary That's roughly 2 KW dissipation from of a pair of tubes rated 1200 watts momentary or 90
/archives//html/Amps/2012-02/msg00329.html (8,299 bytes)

33. Re: [Amps] 4 x GU-81 Grounded Grid Penthodes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 28 Feb 2012 21:02:43 -0500
Thanks Carl, 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-02/msg00333.html (8,699 bytes)

34. Re: [Amps] 4 x GU-81 Grounded Grid Penthodes (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Wed, 29 Feb 2012 12:55:54 -0500
Data sheet: http://danyk.wz.cz/gu81.pdf Or 600 W momentarily. Rated Plate voltage is 3KV below 6 MHz, 2.5 KV below 24 MHz and 1.5 KV below 50 MHz These tubes are regularly abused <:-)) Rated at 750 n
/archives//html/Amps/2012-02/msg00342.html (11,609 bytes)

35. Re: [Amps] Customs drilled a hole in my GU74b / 4CX800s (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 01 Mar 2012 20:47:21 -0500
Normally it's the country of destination who apparently went to the same school as many Government employees. I had an amp come in through Newark. It was listed and clearly labled as Amateur Radio Eq
/archives//html/Amps/2012-03/msg00021.html (10,093 bytes)

36. Re: [Amps] Elecraft W2, nope (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sat, 03 Mar 2012 19:46:43 -0500
Using an LED watt meter that acts like an analog (Emtron DX-2sp amp) it becomes very easy to tune for peak. Typically if you tune for tilt on nominal it won't be right for PEP anyway. There are a num
/archives//html/Amps/2012-03/msg00051.html (8,779 bytes)

37. Re: [Amps] Cell phones, digital cameras and RF (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Mon, 05 Mar 2012 15:43:06 -0500
They are poorly shielded, but their operating frequencies and physical construction makes them pretty much immune to HF. I've never used the camera in the cell phone because no matter how many pixels
/archives//html/Amps/2012-03/msg00059.html (8,686 bytes)

38. Re: [Amps] Cell phones, digital cameras and RF (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 06 Mar 2012 14:30:55 -0500
Not really. That's not even an apples to oranges comparison. It takes a pretty intense RF field to affect body tissue and it varies with frequency. Your 2-meter HT probably exposes you to a 1000 time
/archives//html/Amps/2012-03/msg00066.html (12,285 bytes)

39. Re: [Amps] Buying Stolen Tubes? (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Sun, 11 Mar 2012 15:03:28 -0400
It makes for an interesting story. Stolen? Leverage? They are up front about the history. If they took it to court it's questionable whether it'd be called stolen or not as the new owners were not up
/archives//html/Amps/2012-03/msg00125.html (7,950 bytes)

40. Re: [Amps] Transfer Lettering (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Tue, 13 Mar 2012 21:02:30 -0400
I've never found transfer lettering to be satisfactory and I used a lot of them when working in process control Instrumentation. At least they never lived up to my expectations. They were "OK" but ne
/archives//html/Amps/2012-03/msg00159.html (7,519 bytes)

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