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1. [Amps] 8122 x 12 (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Tue, 28 Dec 2004 21:18:16 -0700; I dropped by the university surplus warehouse today and picked up a couple of beat-up RF amps, Amplifier Research Model 200L. Only one has it's RF deck, and that has just 11 of it's 12 8122 tubes res; /archives//html/Amps/2004-12/msg00370.html (7,301 bytes)
2. Re: [Amps] 8122 x 12 (score: 1): Author: "VE6JY Don Moman" <ve6jy@freenet.edmonton.ab.ca>; Date: Wed, 29 Dec 2004 04:49:35 -0000; Each tube is run way below max... the amp has to be unconditionally stable into any output load - from 0 to infinity over its rated range. Efficiency is not its' strong point, but linearity and survi; /archives//html/Amps/2004-12/msg00371.html (8,365 bytes)
3. Re: [Amps] 8122 x 12 (score: 1): Author: jeff millar <wa1hco@adelphia.net>; Date: Tue, 28 Dec 2004 23:55:53 -0500; That design is called a "transmission line amplifier". The tube output capacitance makes it very difficult to create a matched wide bandwidth amplifier. But, a transmission line can consist of a seri; /archives//html/Amps/2004-12/msg00372.html (8,121 bytes)
4. Re: [Amps] 8122 x 12 (score: 1): Author: Angel Vilaseca <avilaseca@bluewin.ch>; Date: Wed, 29 Dec 2004 07:52:04 +0100; How could such an amp be converted for shortwave use? Can it be assumed that a broadband 4:1 transformer (ferrite toroid core) at the output is all what it takes to get it running on the shortwave ba; /archives//html/Amps/2004-12/msg00373.html (9,476 bytes)
5. Re: [Amps] 8122 x 12 (score: 1): Author: "DF3KV" <df3kv@aol.com>; Date: Wed, 29 Dec 2004 09:35:25 +0100; core) shortwave Hi Angel. It already IS for shortwave use, it is a wideband amplifier, so called distributed amplifier, or "Kettenverstärker" also often used as a driver for large amps It is a n; /archives//html/Amps/2004-12/msg00375.html (8,274 bytes)
6. Re: [Amps] 8122 x 12 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 29 Dec 2004 09:43:21 +0100; About 30 years ago, you could buy such an amplifier from Marconi, the H-1000. It used 12 4CX250B's in a distributed wide-band amplifier configuration and provided 1 kW CW or PEP with 100 mW drive bet; /archives//html/Amps/2004-12/msg00376.html (12,043 bytes)
7. Re: [Amps] 8122 x 12 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 29 Dec 2004 09:45:56 +0100; The AEG-Telefunken 100 kW linears with their 8 x 4CX250B pre-driver (!) stage come to my mind... 73/ Karl-Arne SM0AOM _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2004-12/msg00377.html (9,675 bytes)
8. Re: [Amps] 8122 x 12 (score: 1): Author: G3rzp@aol.com; Date: Wed, 29 Dec 2004 05:19:08 EST; About 30 years ago, you could buy such an amplifier from Marconi, the H-1000. It used 12 4CX250B's in a distributed wide-band amplifier configuration and provided 1 kW CW or PEP with 100 mW drive bet; /archives//html/Amps/2004-12/msg00379.html (8,229 bytes)
9. Re: [Amps] 8122 x 12 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 29 Dec 2004 11:33:38 +0100; When I think about it, the H-1000 was probably only rated to 25 MHz.... Actually their uses as I witnessed them were most for NVIS and as a component in very early frequency-hoppers. 73/ Karl-Arne SM; /archives//html/Amps/2004-12/msg00380.html (9,640 bytes)
10. Re: [Amps] 8122 x 12 (score: 1): Author: G3rzp@aol.com; Date: Wed, 29 Dec 2004 10:17:18 EST; When I think about it, the H-1000 was probably only rated to 25 MHz.... There were variants. When used as a drive for the H1200 30kW tx, they were 4 - 27MHz: stand alone as the HS113 (which I believe; /archives//html/Amps/2004-12/msg00381.html (8,291 bytes)
11. Re: [Amps] 8122 x 12 (score: 1): Author: Angel Vilaseca <avilaseca@bluewin.ch>; Date: Thu, 30 Dec 2004 08:42:43 +0100; I made a search with Google and I found the Amplifier research Model 200L mentioned in a text about an experimental plasma generator. Could you please make some info available? I am currently buildin; /archives//html/Amps/2004-12/msg00393.html (9,688 bytes)
12. Re: [Amps] 8122 x 12 (score: 1): Author: G3rzp@aol.com; Date: Thu, 30 Dec 2004 04:51:29 EST; Could you please make some info available? I can photocopy and mail next week - I could try getting the XYL to use her scanner if she has time before she goes off on her next business trip. Personall; /archives//html/Amps/2004-12/msg00394.html (8,717 bytes)
13. Re: [Amps] 8122 x 12 (score: 1): Author: "Steve Thompson" <g8gsq@ic24.net>; Date: Thu, 30 Dec 2004 10:21:56 -0000; I think it doesn't matter which end is the output, and which end is the resistor - 50% of the power goes into each one. The inductances between the anodes work with the anode capacitance to work like; /archives//html/Amps/2004-12/msg00395.html (9,648 bytes)
14. RE: [Amps] 8122 x 12 (score: 1): Author: "Mike Clarson" <mclarson@rcc.com>; Date: Thu, 30 Dec 2004 11:37:07 -0500; Just some comments on the 8122: This tube, and its conduction cooled version, the 8072, were designed to be inexpensive tubes to compete with the 4CX250 series. They were mechanically robust and suit; /archives//html/Amps/2004-12/msg00398.html (8,239 bytes)

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