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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Life\s+of\s+tubes\s+in\s+ham\s+service\s*$/: 19 ]

Total 19 documents matching your query.

1. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Leigh Turner" <invertech@frontierisp.net.au>
Date: Wed, 27 Dec 2017 08:57:08 +1030
Rob, I concur with your succinct sentiments here about transmitting tubes. The only proviso I would make is the inclusion of a soft-start mechanism on the filaments to bring them up slowly in a contr
/archives//html/Amps/2017-12/msg00161.html (9,642 bytes)

2. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Mark, K5AM" <k5am@zianet.com>
Date: Wed, 27 Dec 2017 00:14:46 +0000
A recent post by Leigh, VK5KLT, suggested: One method for this is found on page 8 of: A Luxury Linear, QEX, May, 1996, 3-12. http://www.zianet.com/k5am/2mkw.pdf 73, Mark, K5AM _______________________
/archives//html/Amps/2017-12/msg00162.html (8,644 bytes)

3. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Wed, 27 Dec 2017 19:21:46 -0500
I have used a scope to monitor filament voltage on a large number of commercial amps and have yet to see one where the filament transformer or winding does not do an excellent job of limiting inrush.
/archives//html/Amps/2017-12/msg00174.html (13,961 bytes)

4. Re: [Amps] Life of tubes in ham service (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 27 Dec 2017 18:36:50 -0600
1964 ?? I was just learning practical uses for a 1963 Impala back seat. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2017-12/msg00175.html (8,287 bytes)

5. Re: [Amps] Life of tubes in ham service (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 28 Dec 2017 10:42:22 +0800
If the HV hasnt been recapped with over 25-30 uF total that transformer or winding is also a good inrush limiter also offering switch protection.. If spending money is of no concern then by all means
/archives//html/Amps/2017-12/msg00176.html (15,711 bytes)

6. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Wed, 27 Dec 2017 20:46:57 -0600
They were probably Burle brand? They were famous for pink ceramic. RCA made a few too. 73 Jim W7RY If the HV hasnt been recapped with over 25-30 uF total that transformer or winding is also a good in
/archives//html/Amps/2017-12/msg00177.html (16,315 bytes)

7. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Wed, 27 Dec 2017 21:47:35 -0500
That is the year I bought a 64 GTO convertible and still had a 57 Chevy convertible as a beater. In 67 I started a series of 63 Impalas when I sold the GTO as the DP for a house in NH, we came from M
/archives//html/Amps/2017-12/msg00178.html (10,915 bytes)

8. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Wed, 27 Dec 2017 21:54:20 -0500
Those would have been the real Svetlana who started the pink ceramic which RCA copied. They still use it on the GS36B/4CX400A which is a superb tube and Ive converted several NCL-2000's to a pair. I
/archives//html/Amps/2017-12/msg00179.html (16,470 bytes)

9. Re: [Amps] Life of tubes in ham service (score: 1)
Author: Stan Gammons <s_gammons@charter.net>
Date: Wed, 27 Dec 2017 20:59:46 -0600
How does one go about identifying what mfg made the Russian tubes?   The GI-7BT's I have have purple ceramic.  They have some marking on them, but no mfg name. One of these days I'll get around to bu
/archives//html/Amps/2017-12/msg00180.html (16,266 bytes)

10. Re: [Amps] Life of tubes in ham service (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 28 Dec 2017 11:02:19 +0800
Yes, they probably did but no, these were definitely Russian tubes. I got to see the new ones and the pulls. 73 Jim W7RY If the HV hasnt been recapped with over 25-30 uF total that transformer or win
/archives//html/Amps/2017-12/msg00181.html (16,404 bytes)

11. Re: [Amps] Life of tubes in ham service (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 28 Dec 2017 11:03:43 +0800
Indeed, they were them. Carl If the HV hasnt been recapped with over 25-30 uF total that transformer or winding is also a good inrush limiter also offering switch protection.. If spending money is of
/archives//html/Amps/2017-12/msg00182.html (16,989 bytes)

12. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 28 Dec 2017 02:15:54 -0500
"I think" the GI-7B would be an easy tube to convert to transverse cooling to replace the no longer available Eimac tubes in the MLA-2500s.  The coolers are easily replaced by removing a single screw
/archives//html/Amps/2017-12/msg00183.html (17,199 bytes)

13. [Amps] Life of tubes in ham service (score: 1)
Author: John Lyles <jtml@losalamos.com>
Date: Thu, 28 Dec 2017 15:40:33 -0700
Actually it was RCA who made the pink ceramic insulators. It was Frenchtown ceramic, and the material came from mines in NJ. A trace of chromium gave it the good characteristics over plain alumina ce
/archives//html/Amps/2017-12/msg00185.html (8,081 bytes)

14. Re: [Amps] Life of tubes in ham service (score: 1)
Author: Stan Gammons <s_gammons@charter.net>
Date: Thu, 28 Dec 2017 17:39:09 -0600
On 12/28/2017 01:15 AM, Roger (K8RI) wrote: "I think" the GI-7B would be an easy tube to convert to transverse cooling to replace the no longer available Eimac tubes in the MLA-2500s.  The coolers ar
/archives//html/Amps/2017-12/msg00186.html (9,903 bytes)

15. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 29 Dec 2017 20:32:14 -0500
Silicone rubber sheet wrapped into a cylinder works fine and requires no machining. The ends simply overlap. The joint can be made a number of ways including RTV. There was a RED high temp RTV availa
/archives//html/Amps/2017-12/msg00188.html (12,149 bytes)

16. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Fri, 29 Dec 2017 19:46:25 -0600
Lots of Teflon and silicone on eBay. I have also successfully used turbo charger hose. Buy it by the inch. I use it on my 3CX800 amplifier. It's silicone sheet with a cloth cover. Used to connect the
/archives//html/Amps/2017-12/msg00189.html (12,679 bytes)

17. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Fri, 29 Dec 2017 19:47:34 -0600
Oh... And I have used small screws, (2-56) and nuts to hold Teflon sheet together for tube chimneys. 73 Jim W7RY Happy New Year! Lots of Teflon and silicone on eBay. I have also successfully used tur
/archives//html/Amps/2017-12/msg00190.html (12,613 bytes)

18. [Amps] Life of tubes in ham service (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 29 Dec 2017 18:21:08 -0800
<Rob, I concur with your succinct sentiments here about transmitting tubes. The only proviso I would make is the inclusion of a soft-start mechanism on the filaments to bring them up slowly in a cont
/archives//html/Amps/2017-12/msg00192.html (7,750 bytes)

19. Re: [Amps] Life of tubes in ham service (score: 1)
Author: "Carl" <km1h@jeremy.qozzy.com>
Date: Sat, 30 Dec 2017 09:44:52 -0500
There is a version for wrapping headers and other exhaust pipes where clearance is a problem. Carl Silicone rubber sheet wrapped into a cylinder works fine and requires no machining. The ends simply
/archives//html/Amps/2017-12/msg00193.html (12,650 bytes)

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