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1. [Amps] 4pr-1000b,Y448 tubes (score: 1): Author: Ve6wz_Steve <ve6wz@shaw.ca>; Date: Wed, 10 Dec 2003 14:22:43 -0700; I have searched google for details on the diferances between the 4pr-1000b (pulse tube) and the basic 4-1000a and have found limited information. My HB 4-1000 amp, GG with 6Kv anode voltage performs; /archives//html/Amps/2003-12/msg00166.html (6,642 bytes)
2. Re: [Amps] 4pr-1000b,Y448 tubes (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 11 Dec 2003 08:15:31 -0500; I have talked with R. Brandon at EIMAC (CPI) about this. It seems that they are 4-1000A and the 4PR1000 tubes are the same. The 4PR1000b tubes are taken off the production line of the 4-1000A tubes a; /archives//html/Amps/2003-12/msg00175.html (9,852 bytes)
3. RE: [Amps] 4pr-1000b,Y448 tubes (score: 1): Author: Ve6wz_Steve <ve6wz@shaw.ca>; Date: Thu, 11 Dec 2003 21:42:45 -0700; The short summary from my inquiry is that the 4PR-1000 is essentially the same device as the 4-1000 except it can survive higher plate voltages because it used in that type of service. HF Ham perform; /archives//html/Amps/2003-12/msg00185.html (7,708 bytes)
4. Re: [Amps] 4pr-1000b,Y448 tubes (score: 1): Author: R.Measures <r@somis.org>; Date: Thu, 11 Dec 2003 07:47:41 -0800; ** As I understand it, the Y-448 draws slightly more filament current than a 4-1000A, and therefore has more peak emission - which a good thing for pulse service. ____________________________________; /archives//html/Amps/2003-12/msg00196.html (10,956 bytes)
5. RE: [Amps] 4pr-1000b,Y448 tubes (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 12 Dec 2003 05:24:08 -0800; ** Tetrodes with handles emit an erie blue light from the ceramic anode-screen insulator. The blue light process: Those electrons from the cathode that miss the anode, collide into outer-band orbit; /archives//html/Amps/2003-12/msg00205.html (8,905 bytes)

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