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Total 29 documents matching your query.

1. [Amps] 3-500Z cool down time (score: 1): Author: Clark Turner <Clark@ClarkTurnerTuning.com>; Date: Mon, 5 Jun 2017 08:21:05 -0700; RF parts supposedly told a local ham that 3-500Z RF parts tubes need a minimum of 30 Full minutes of cool down with the blower on and that they also need to warm up. He insisted they told him this in; /archives//html/Amps/2017-06/msg00042.html (7,555 bytes)
2. Re: [Amps] 3-500Z cool down time (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Mon, 5 Jun 2017 08:35:37 -0700; IIRC, Eimac never made Graphite 3-500's, if I am wrong, someone will correct me. The Graphite Anode, being of larger mass, and who knows what's in them, may need those precautions. Saying that, I con; /archives//html/Amps/2017-06/msg00043.html (8,461 bytes)
3. Re: [Amps] 3-500Z cool down time (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 5 Jun 2017 10:44:16 -0500; My understanding is the graphite is dimensionally stable with temperature -- that's part of why graphite is used in aircraft dry vacuum pumps, which get very hot. Thus, I don't buy that explanation.; /archives//html/Amps/2017-06/msg00044.html (9,243 bytes)
4. Re: [Amps] 3-500Z cool down time (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Mon, 5 Jun 2017 12:24:13 -0500; Well, the plate is in a vacuum so no heat is conducted to the glass envelope except for the small plate lead pin. All the air in the world isn't going to cool the plate down. Forced air on the tube i; /archives//html/Amps/2017-06/msg00048.html (9,086 bytes)
5. Re: [Amps] 3-500Z cool down time (score: 1): Author: Joe <nss@mwt.net>; Date: Mon, 5 Jun 2017 12:28:32 -0500; Plus in my amp if I ever got the plates hot enough to glow red or orange. I'd say once RF is removed I bet it's less than a second that it's no longer colored, and not long after that what ever temp; /archives//html/Amps/2017-06/msg00049.html (9,985 bytes)
6. Re: [Amps] 3-500Z cool down time (score: 1): Author: Clark Turner <Clark@ClarkTurnerTuning.com>; Date: Mon, 5 Jun 2017 10:30:12 -0700; That makes sense to me Gary. I have never heard of cracked Graphite plates. C Forced air on the tube is to keep the seal temperature down. All of the cooling of the plate is accomplished by radiation; /archives//html/Amps/2017-06/msg00050.html (9,450 bytes)
7. Re: [Amps] 3-500Z cool down time (score: 1): Author: "JC" <n4is@comcast.net>; Date: Mon, 5 Jun 2017 14:51:10 -0400; I think my 813 worked 20years with 3500V 800W out on a single tube, ground grid amplifier. The graphite plate got orange to yellow in few seconds any time ptt was on and back to graphite color few se; /archives//html/Amps/2017-06/msg00056.html (10,599 bytes)
8. Re: [Amps] 3-500Z cool down time (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Mon, 5 Jun 2017 12:39:26 -0600; Well, the plate is in a vacuum so no heat is conducted to the glass envelope except for the small plate lead pin. All the air in the world isn't going to cool the plate down. I think that's not quite; /archives//html/Amps/2017-06/msg00058.html (8,634 bytes)
9. Re: [Amps] 3-500Z cool down time (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Mon, 5 Jun 2017 15:20:09 -0400; Im happy to oblige. The initial runs had graphite plates and were made by Philips until Eimac got their act together. Early SB-220's and other late 69 early 70 amps used them. Amperex (owned by Phili; /archives//html/Amps/2017-06/msg00059.html (10,477 bytes)
10. Re: [Amps] 3-500Z cool down time (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Mon, 5 Jun 2017 14:44:46 -0700; IIRC, so did Amperex. I think one issue today is that the Graphite of today may be not the Graphite of yore. 73, Dick, W1KSZ 73, Dick, W1KSZ _______________________________________________ Amps maili; /archives//html/Amps/2017-06/msg00063.html (10,946 bytes)
11. Re: [Amps] 3-500Z cool down time (score: 1): Author: Clark Turner <Clark@ClarkTurnerTuning.com>; Date: Mon, 5 Jun 2017 14:49:48 -0700; I agree. I wondered if these newer made RF parts tubes are in fact not instant on and require warm up and cool down. C On 6/5/2017 10:28 AM, Joe wrote: Plus in my amp if I ever got the plates hot eno; /archives//html/Amps/2017-06/msg00064.html (10,920 bytes)
12. Re: [Amps] 3-500Z cool down time (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Mon, 5 Jun 2017 23:39:56 +0000; Too bad they don't make a ceramic version of the 3-500z, or do they? I think that would be a very popular tube! 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@c; /archives//html/Amps/2017-06/msg00066.html (8,212 bytes)
13. Re: [Amps] 3-500Z cool down time (score: 1): Author: R Morris <robrk@nidhog.net>; Date: Mon, 5 Jun 2017 21:07:19 -0400; 3CX1200 Sent from my iPhone Too bad they don't make a ceramic version of the 3-500z, or do they? I think that would be a very popular tube! 73, Bill W6WRT ____________________________________________; /archives//html/Amps/2017-06/msg00070.html (8,989 bytes)
14. Re: [Amps] 3-500Z cool down time (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 5 Jun 2017 20:48:40 -0500; The 3CX1200 is a ceramic version of the 3-1000Z. I have an amp that uses one and it's ready in under 10 s. Kim N5OP "People that make music together cannot be enemies, at least as long as the music l; /archives//html/Amps/2017-06/msg00072.html (9,700 bytes)
15. Re: [Amps] 3-500Z cool down time (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 6 Jun 2017 02:32:21 +0000; -- ORIGINAL MESSAGE --(may be snipped) REPLY: Yes, but that's a very expensive tube. I was thinking of a ceramic 3-500Z for the same price as glass. For what they are asking you might as well get an; /archives//html/Amps/2017-06/msg00073.html (9,391 bytes)
16. Re: [Amps] 3-500Z cool down time (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Tue, 6 Jun 2017 06:53:23 -0500; Yes. Eimac made graphite 3-500 tubes. The really old ones were graphite. I've had some. They are 1960s date codes. Looked like a Chinese/RF parts tube. 73 Jim W7RY IIRC, Eimac never made Graphite 3-5; /archives//html/Amps/2017-06/msg00076.html (10,550 bytes)
17. Re: [Amps] 3-500Z cool down time (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Tue, 6 Jun 2017 13:40:36 +0000 (UTC); True enough; I was simply statingthat the 3CX1200 is a ceramic replacement for a glass envelope. It's a fine tube, though it requires a fair bit more drive. That is, aparently, the price paid for a h; /archives//html/Amps/2017-06/msg00078.html (10,533 bytes)
18. Re: [Amps] 3-500Z cool down time (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Tue, 6 Jun 2017 14:04:07 +0000 (UTC); Given that ceramic tubes appear to last longer on the shelf with less leakage than glass, it's a shame that there isn't a ceramic tube in the price/performance range of the 3-500Z. It would be well w; /archives//html/Amps/2017-06/msg00079.html (10,351 bytes)
19. Re: [Amps] 3-500Z cool down time (score: 1): Author: Kimberly Elmore <cw_de_n5op@sbcglobal.net>; Date: Tue, 6 Jun 2017 14:56:40 +0000 (UTC); The biggest issue with the 3CX1200 is appears to be that it's simply not used in much outiside of ham radio. I'm not sure what the original design application was intended for, but I'm pretty sure it; /archives//html/Amps/2017-06/msg00081.html (11,086 bytes)
20. Re: [Amps] 3-500Z cool down time (score: 1): Author: Catherine James <catherine.james@att.net>; Date: Tue, 6 Jun 2017 15:14:26 +0000 (UTC); Kim, It's generally recognized that glass tubes have poor shelf life due to slow leakage. I have heard many reports of this from people I trust. They will last much longer if the plate gets hot at le; /archives//html/Amps/2017-06/msg00082.html (12,221 bytes)

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