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Total 14 documents matching your query.

1. [AMPS] Tube identification (score: 1): Author: K4SO@aol.com (K4SO@aol.com); Date: Fri, 15 Jan 1999 21:29:58 EST; Thanks to those answering my initial inquiry. The numbers provided are apparently a date code, although not in the format I was familiar with on my 4-1000s and 8874s. Also, I have now explored that E; /archives//html/Amps/1999-01/msg00194.html (7,288 bytes)
2. [AMPS] Tube identification (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Sat, 16 Jan 1999 12:43:48 -0600; Having worked at Motorola, I know what this is! This is a Motorola internal part number. The 65 prefix means its a vacuum tube and the D02 means that it is second in a family of tubes (D01, D02, etc; /archives//html/Amps/1999-01/msg00211.html (7,877 bytes)
3. [AMPS] Tube identification (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sat, 16 Jan 1999 17:25:31 -0500; After multiple layers of BS the bottom line is that it is most likely a standard production tube . Look at it ...if it looks like a 5894, 4CX250 series, etc it probably is. The real question is the f; /archives//html/Amps/1999-01/msg00213.html (9,601 bytes)
4. [Amps] Tube Identification (score: 1): Author: George KB2Z <Thermionic_Emission@earthlink.net>; Date: Fri, 15 Jul 2005 08:15:52 -0400; Morning all, I have a pair of Eimac 3-500 tubes I would like to sell and would like suggestions for identifying them. They are putting out over a 1000W cw. I dont want to sell them to have an un-ethi; /archives//html/Amps/2005-07/msg00167.html (6,560 bytes)
5. Re: [Amps] Tube Identification (score: 1): Author: George Cortez <ne2i@optonline.net>; Date: Fri, 15 Jul 2005 10:13:13 -0400; maybe use an etching tool at the top of the anode connector? or at the top of one of the pins anything like a permanent marker could be wiped off. perhaps a little bit of enamel nail polish ( they co; /archives//html/Amps/2005-07/msg00168.html (7,416 bytes)
6. [Amps] Tube Identification (score: 1): Author: Bob Easterbrooks <k6jqa@jasonsplace.info>; Date: Fri, 15 Jul 2005 07:56:08 -0700; George, I don't know about 3-500's , but on a bunch of 4-400's that I have, all have a different number stamped on the internal screen shield. I have Eimac's and Amperex. Don't know about other brand; /archives//html/Amps/2005-07/msg00169.html (7,105 bytes)
7. [Amps] Tube Identification (score: 1): Author: Bob Easterbrooks <k6jqa@jasonsplace.info>; Date: Fri, 15 Jul 2005 08:02:52 -0700; George, I don't know about 3-500's , but on a bunch of 4-400's that I have, all have a different number stamped on the internal screen shield. I have Eimac's and Amperex. Don't know about other brand; /archives//html/Amps/2005-07/msg00170.html (6,683 bytes)
8. Re: [Amps] Tube Identification (score: 1): Author: John Irwin <crazytvjohn@yahoo.com>; Date: Fri, 15 Jul 2005 16:19:34 -0700 (PDT); Hi Suggest you put your mark on the tube somewhere obvious and also somewhere not so noticeable. Perhaps the top of plate cap maybe or marker on the glass with a marker. It Will prevent switching tub; /archives//html/Amps/2005-07/msg00176.html (8,795 bytes)
9. [Amps] Tube Identification (score: 1): Author: "Robert Dorchuck W6VY" <w6vy@verizon.net>; Date: Tue, 04 Oct 2005 17:59:46 -0700; Can anyone help me identify a couple of tubes. They look like 4CX250B's. They were made by Eimac for IFI and the IFI number is M400. The only other markings are what appears to be the date code of 90; /archives//html/Amps/2005-10/msg00120.html (6,589 bytes)
10. Re: [Amps] Tube Identification (score: 1): Author: Steve Thompson <g8gsq@ic24.net>; Date: Wed, 05 Oct 2005 07:28:30 +0100; Likelyhood is they are 4CX250s, with custom marking to secure spares business at generous prices. Sometimes there's non-standard testing to verify particular characteristics for the customer. Steve _; /archives//html/Amps/2005-10/msg00123.html (6,961 bytes)
11. [Amps] Tube identification (score: 1): Author: "Gary Smith" <Gary@ka1j.com>; Date: Sat, 20 Jul 2013 11:40:31 -0400; Back in the 80's I came across an Eimac tube that I think was a 1500 something. As I recall it had a bayonet mount but instead of fins it had many circular or curled radiators/fins on what would have; /archives//html/Amps/2013-07/msg00053.html (6,564 bytes)
12. Re: [Amps] Tube identification (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Sat, 20 Jul 2013 18:52:20 +0200; I've just looked through my 1984 Eimac power grid short-form catalogue, and can't find anything looking like that which you describe. 73 Peter G3RZP == Message Received: Jul 20 2013, 04:40 PM From: "; /archives//html/Amps/2013-07/msg00054.html (7,415 bytes)
13. Re: [Amps] Tube identification (score: 1): Author: "Gary Smith" <Gary@ka1j.com>; Date: Sat, 20 Jul 2013 13:16:16 -0400; I understand, I had bought a small lot of them as pulls back around 87-88 thinking they were perhaps valuable as I'd never seen anything like them before. I don't recall the ID number, only they were; /archives//html/Amps/2013-07/msg00055.html (8,550 bytes)
14. Re: [Amps] Tube identification (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 20 Jul 2013 13:21:28 -0400; No guarantee but it may be in this collection http://n6jv.com/ Carl KM1H Back in the 80's I came across an Eimac tube that I think was a 1500 something. As I recall it had a bayonet mount but instead; /archives//html/Amps/2013-07/msg00056.html (8,129 bytes)

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