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Total 53 documents matching your query.

41. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 06 Dec 2009 02:09:14 -0500
Cooling flow and pressure are like voltage, amps, and resistance the figures as given in the data sheets tell two things. That the tube needs a given flow in CFM for a given power and that the "fan"
/archives//html/Amps/2009-12/msg00152.html (20,972 bytes)

42. Re: [Amps] Advice (score: 1)
Author: Ron Youvan <ka4inm@tampabay.rr.com>
Date: Sun, 06 Dec 2009 14:02:59 +0000
Not at all unusual at all, it takes is airborne lint to accumulate in the fins of the blower to reduce air flow, a few broadcast engineers have been known to log manometer readings down to the solde
/archives//html/Amps/2009-12/msg00153.html (8,990 bytes)

43. Re: [Amps] Advice (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sun, 6 Dec 2009 09:51:41 -0500
I sometimes wonder if the published specs are on the conservative side. Take the Amp Supply LK-800 series for example. It runs 3 3CX800's. The cooling is by a Papst muffin fan mounted in the small en
/archives//html/Amps/2009-12/msg00157.html (23,557 bytes)

44. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Sun, 06 Dec 2009 13:49:49 -0500
I have been running 4 quad core, high performance computers with video cards that draw over 300 watts and sound like a turbine starting up. I have to vacuum the air intake filters about every 3 month
/archives//html/Amps/2009-12/msg00170.html (9,747 bytes)

45. Re: [Amps] Advice (score: 1)
Author: "Gary Schafer" <garyschafer@comcast.net>
Date: Sun, 6 Dec 2009 17:39:38 -0500
In looking more into other spec sheets it seems the cooling requirements are all over the place. I have a chart in one book that shows a 4CX350 and the cooling air requirements is almost linear with
/archives//html/Amps/2009-12/msg00178.html (21,422 bytes)

46. Re: [Amps] Advice (score: 1)
Author: donroden@hiwaay.net
Date: Sun, 06 Dec 2009 21:35:33 -0600
WAAY-TV ran a Varian 4KM150LA for over 200,000 hours @ 55KW out. It was the longest lasting Varian Klystron in 1992 ( written up in Broadcast Engineering )and lasted another 17 years. Over a quarter
/archives//html/Amps/2009-12/msg00183.html (8,350 bytes)

47. Re: [Amps] Advice (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Sun, 06 Dec 2009 21:16:07 -0800
ORIGINAL MESSAGE: REPLY: Guys, keep in mind the REAL cooling requirements are based on the temperature of the tube seals. How you get there, i.e. the amount of airflow, can vary all over the place de
/archives//html/Amps/2009-12/msg00184.html (8,388 bytes)

48. Re: [Amps] Advice (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Mon, 7 Dec 2009 09:30:49 -0500
Some of the cooling specs appear to be highly variable. I suspect that as enginnering staff changed and tube application changed the combination resulted in different numbers. In other cases the spec
/archives//html/Amps/2009-12/msg00189.html (9,454 bytes)

49. Re: [Amps] Advice (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 07 Dec 2009 12:42:42 -0800
ORIGINAL MESSAGE: REPLY: I think I have to take issue with this statement. As I see it, the spec for max temp on tube seals is absolute, based on the differential expansion rate of metal vs either ce
/archives//html/Amps/2009-12/msg00198.html (8,798 bytes)

50. Re: [Amps] Advice (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Mon, 7 Dec 2009 18:15:27 -0500
If you want to critique Id appreciate it if you dont edit my post to suit your reply. Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contestin
/archives//html/Amps/2009-12/msg00204.html (9,592 bytes)

51. Re: [Amps] Advice (score: 1)
Author: "Bill, W6WRT" <dezrat1242@yahoo.com>
Date: Mon, 07 Dec 2009 16:48:19 -0800
ORIGINAL MESSAGE: REPLY: Ok, but in this instance it doesn't make any difference. Here's your entire quote: "Some of the cooling specs appear to be highly variable. I suspect that as engineering staf
/archives//html/Amps/2009-12/msg00210.html (9,414 bytes)

52. Re: [Amps] Advice (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Mon, 7 Dec 2009 20:42:43 -0500
I said cooling specs. What that refers to are tubes that the spec changed over different revisions of the spec sheet. Seal temperature is a constant these days but was not always so as processes impr
/archives//html/Amps/2009-12/msg00214.html (9,447 bytes)

53. Re: [Amps] Advice (score: 1)
Author: Roger <sub1@rogerhalstead.com>
Date: Mon, 07 Dec 2009 21:22:23 -0500
It's quite common when going through designs for ceramic/metal tubes from different times to see the maximum seal temps vary from 200 to 250C. 73 Roger (K8RI) ________________________________________
/archives//html/Amps/2009-12/msg00216.html (10,518 bytes)

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