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1. Re: [Amps] Any new tube research? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 15 Aug 2011 20:02:28 +0000; Let me chime in on this thread: As semiconductors have improved over the last half century, they have progressively replaced, displaced, and ruled out tubes that formerly were used instead of them. K; /archives//html/Amps/2011-08/msg00068.html (9,027 bytes)
2. [Amps] Any new tube research? (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Tue, 16 Aug 2011 12:01:44 -0600; Ignoring more exotic tubes like gyrocons, gyrotrons, TWTs, relativistic electron devices, things that the Naval Research Lab is doing, there is still vacuum tube improvement being done in the industr; /archives//html/Amps/2011-08/msg00069.html (11,113 bytes)
3. Re: [Amps] Any new tube research? (score: 1): Author: Pete Lancashire <pete@petelancashire.com>; Date: Wed, 17 Aug 2011 08:33:20 -0700; some what of a Segway, is tubes for AC->DC->AC transmission. That segment had converted to SS quite some time ago. -pete _______________________________________________ Amps mailing list Amps@contest; /archives//html/Amps/2011-08/msg00073.html (12,931 bytes)
4. Re: [Amps] Any new tube research? (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Fri, 19 Aug 2011 19:05:55 -0400; On 8/16/2011 2:01 PM, John Lyles wrote:<snip> I really don't see wide adoption of SS legal limit amps until the devices can be made more rugged, can be cooled more easily, and become available at muc; /archives//html/Amps/2011-08/msg00099.html (11,689 bytes)
5. Re: [Amps] Any new tube research? (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 20 Aug 2011 09:23:11 -0400; Aww, you poor fella, I feel your pain (-; The 6C21's (pulse rated 450T family) in one of my AM amps are 12.625" tall not counting the heat radiating plate cap. At least the 304TL modulators are short; /archives//html/Amps/2011-08/msg00102.html (8,976 bytes)
6. [Amps] Any new tube research? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sat, 20 Aug 2011 09:34:14 -0700; I really don't see wide adoption of SS legal limit amps until the devices can be made more rugged, can be cooled more easily, and become available at much lower prices. Prices are based on tooling se; /archives//html/Amps/2011-08/msg00104.html (10,181 bytes)
7. Re: [Amps] Any new tube research? (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Fri, 19 Aug 2011 23:26:54 -0400; I used to think the same thing...but not any more. The Freescale MRFE6VP61 can withstand 60:1 VSWR for 10 msec, which is plenty of time for a simple controller to shut it down. That part costs $271 f; /archives//html/Amps/2011-08/msg00106.html (10,372 bytes)
8. Re: [Amps] Any new tube research? (score: 1): Author: Dan Mills <dmills@exponent.myzen.co.uk>; Date: Sat, 20 Aug 2011 18:18:04 +0100; Agreed that FETs on a reasonable DC rail will likely become increasingly popular, but you forgot the major component count from your list of boxes: Solid state amps use low Q output networks requirin; /archives//html/Amps/2011-08/msg00107.html (8,445 bytes)
9. Re: [Amps] Any new tube research? (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Sat, 20 Aug 2011 21:56:25 -0400; Try as I might I've not been able to find a data sheet on the MRFE6VP61. When it gets to 5 or 10 seconds then I'd be comfortable. I do not like having to depend on fast acting protective circuits. Yo; /archives//html/Amps/2011-08/msg00114.html (19,422 bytes)
10. Re: [Amps] Any new tube research? (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Sat, 20 Aug 2011 22:18:42 -0400; On 8/20/2011 9:23 AM, Carl wrote:<snip> Yah...decisions, decisions, decisions... I think I've mentioned, my first high power amp was a 6C21. I saw a pair of them running PP to a *vertical* tuned line; /archives//html/Amps/2011-08/msg00115.html (8,685 bytes)
11. Re: [Amps] Any new tube research? (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Sun, 21 Aug 2011 00:07:37 -0400; I still need a 1500T to complete my collection. I have every one from the 15E to the 2000T but not the 1500T. 73 bill wa4lav Largest tube in collection is a 3CV200,000A7 But has grid short. If copper; /archives//html/Amps/2011-08/msg00117.html (9,808 bytes)
12. Re: [Amps] Any new tube research? (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Sun, 21 Aug 2011 01:41:22 -0400; I had one of the Tokyo Hy-Power HL-1.5Kfx amps. It ran an honest KW out 160-10 and 800 watts out on six meters. It was auto band switching(with band data signal from the exciter), but power fell off; /archives//html/Amps/2011-08/msg00118.html (13,291 bytes)
13. Re: [Amps] Any new tube research? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 22 Aug 2011 01:00:14 +0000; Roger, If you want that thermal mass as a safety measure against failure of the cooling circuit, why not use water for the thermal mass too? After all water has a specific heat per weight that is mor; /archives//html/Amps/2011-08/msg00132.html (9,759 bytes)
14. Re: [Amps] Any new tube research? (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Mon, 22 Aug 2011 01:00:42 -0400; True, but you are far less likely to lose that copper than you are water flow. Loss of flow in water cooled systems is probably the most common failure, hence you need something to back it up and the; /archives//html/Amps/2011-08/msg00137.html (14,656 bytes)

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