Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Holding\s+a\s+vacuum\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Holding\s+a\s+vacuum\s*$/: 15 ]

Total 15 documents matching your query.

1. [Amps] Holding a vacuum (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Wed, 26 Nov 2014 08:08:54 -0800; I'm curious as to your experiences with tubes in long term storage. The question is, which type holds a vacuum better - glass or ceramic, or is there no difference? My own limited experience says cer; /archives//html/Amps/2014-11/msg00054.html (7,002 bytes)
2. Re: [Amps] Holding a vacuum (score: 1): Author: Glen Zook via Amps <amps@contesting.com>; Date: Wed, 26 Nov 2014 16:46:12 +0000 (UTC); It depends! There are certain tubes, like the 3-500Z, that are notorious for losing vacuum. But, I have quite a number of glass tubes that were manufactured in the 1920s that are still fine. The ce; /archives//html/Amps/2014-11/msg00055.html (7,815 bytes)
3. Re: [Amps] Holding a vacuum (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Thu, 27 Nov 2014 15:24:55 -0500; I'm curious as to your experiences with tubes in long term storage. The question is, which type holds a vacuum better - glass or ceramic, or is there no difference? My own limited experience says ce; /archives//html/Amps/2014-11/msg00059.html (9,021 bytes)
4. Re: [Amps] Holding a vacuum (score: 1): Author: Pete N4KW <n4kwpete@centurylink.net>; Date: Fri, 28 Nov 2014 10:43:46 -0500; Earlier this week I emailed Eimac with the question about shelf life of the new 4CX1500B tubes that I have. I also asked about the serial number on the tubes and how to read it. I am awaiting the cod; /archives//html/Amps/2014-11/msg00061.html (9,907 bytes)
5. Re: [Amps] Holding a vacuum (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Fri, 28 Nov 2014 11:39:01 -0500; A small fan is fine. Carl KM1H Earlier this week I emailed Eimac with the question about shelf life of the new 4CX1500B tubes that I have. I also asked about the serial number on the tubes and how to; /archives//html/Amps/2014-11/msg00062.html (11,015 bytes)
6. Re: [Amps] Holding a vacuum (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Fri, 28 Nov 2014 20:06:17 +0200; Yes, you MUST pass air through the socket to cool the seals whenever heater voltage is applied! Vic k2vco/4x6gp Sent from my phone _______________________________________________ Amps mailing list Am; /archives//html/Amps/2014-11/msg00063.html (11,157 bytes)
7. Re: [Amps] Holding a vacuum (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Sat, 29 Nov 2014 07:31:11 +0800; Yes. That's correct. I use a cheap plastic tub with a filament transformer and small blower from an old microwave oven mounted inside. The tub is inverted and the base of the tub has the tube socket; /archives//html/Amps/2014-11/msg00069.html (13,420 bytes)
8. Re: [Amps] Holding a vacuum (score: 1): Author: "Karin Johnson" <karinann@tampabay.rr.com>; Date: Thu, 27 Nov 2014 19:15:08 -0500; What metric does one use to determine if a given tube holds a vacuum or not? Cheers, Karin K3UU _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont; /archives//html/Amps/2014-12/msg00001.html (6,821 bytes)
9. Re: [Amps] Holding a vacuum (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Mon, 1 Dec 2014 09:38:34 -0800; -- ORIGINAL MESSAGE --(may be snipped) REPLY: Tubes that lose vacuum draw excess anode current even when idling and if they are glass, one can see a blue glow in between the elements when HV is appli; /archives//html/Amps/2014-12/msg00002.html (6,782 bytes)
10. Re: [Amps] Holding a vacuum (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Mon, 1 Dec 2014 13:32:19 -0500; Hi Karin. the direct answer is the tube will withstand application of the rated hv with only a few microamperes of leakage current showing. The non-destructive test method is use of a high voltage br; /archives//html/Amps/2014-12/msg00003.html (8,433 bytes)
11. Re: [Amps] Holding a vacuum (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 1 Dec 2014 10:34:21 -0800; I always thought that a gassy tube is essentially a short when HV is applied, or perhaps like a thyratron: once current is allowed to flow by the control grid it can't be stopped until the cathode li; /archives//html/Amps/2014-12/msg00004.html (8,679 bytes)
12. Re: [Amps] Holding a vacuum (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Mon, 1 Dec 2014 15:24:19 -0500; It all depends upon what you mean by gas and what is its density. Altho the air we breathe is a gas it is not called that in tube technology and to avoid the misinterpertation it is referred to as "g; /archives//html/Amps/2014-12/msg00006.html (12,981 bytes)
13. Re: [Amps] Holding a vacuum (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 1 Dec 2014 14:38:47 -0600; Ah! Thanks, Carl. This does, however, raise another question: when read here about storage life of transmitting tubes and whether they become gassy, it seems from what you write that whatever happens; /archives//html/Amps/2014-12/msg00007.html (14,243 bytes)
14. Re: [Amps] Holding a vacuum (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Mon, 1 Dec 2014 15:59:57 -0500; No, as I mentioned both seal leakage plus internal outgassing as possibilities. Carl KM1H Ah! Thanks, Carl. This does, however, raise another question: when read here about storage life of transmitti; /archives//html/Amps/2014-12/msg00009.html (13,346 bytes)
15. Re: [Amps] Holding a vacuum (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 02 Dec 2014 04:23:08 -0500; One example is the PL-172/8295A. Basically the same tube and the PL-172 has the 8295 designation as well, BUT the PL-172 is a metal, external anode, Pentode with the anode seal made of glass.. The 82; /archives//html/Amps/2014-12/msg00013.html (10,040 bytes)

Current List: 1 - 15
Page: [1]