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1. [Amps] tube replacement ? (score: 1): Author: Posselt Werner <W.Posselt@maco.at>; Date: Mon, 17 Nov 2003 10:50:28 +0100; Hello! I have an amplifier with 2x 4-400 which has a really big power supply and a very rugged design. The only thing I am missing is the appropriate output power. This lead to the idea to replace th; /archives//html/Amps/2003-11/msg00231.html (6,981 bytes)
2. Re: [Amps] tube replacement ? (score: 1): Author: Dennis12Amplify@aol.com; Date: Mon, 17 Nov 2003 15:53:35 EST; Werner, If I were you I would either add a screen supply to those tetrodes to get the transconductance back again, or (since you said the 4-400s were running with grounded grids), try just plugging i; /archives//html/Amps/2003-11/msg00236.html (7,981 bytes)
3. Re: [Amps] tube replacement ? (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 18 Nov 2003 03:21:18 -0800; ** The 4-400A and the 3-500Z use the same 5V/14.5A cathode and have the same peak-emission (c. 1.3A) , thus, the output Z of a 4-400A and a 3-500Z are pretty much the same if the anode supply potent; /archives//html/Amps/2003-11/msg00247.html (8,667 bytes)
4. Re: [Amps] tube replacement ? (score: 1): Author: Dennis12Amplify@aol.com; Date: Tue, 18 Nov 2003 16:41:37 EST; Rich, He's running the 4-400's grounded grid, so the peak emission would not be the same without a MUCH higher cathode drive level, and then only if that maximum cathode emission you refer to could a; /archives//html/Amps/2003-11/msg00250.html (9,330 bytes)
5. Re: [Amps] tube replacement ? (score: 1): Author: R.Measures <r@somis.org>; Date: Tue, 18 Nov 2003 17:00:04 -0800; ** Applying screen V to a tetrode with both grids RF-grounded does not change the amplification because screen-amplification only occurs when the the grid's RF potential differs from that on the scr; /archives//html/Amps/2003-11/msg00255.html (10,384 bytes)
6. Re: [Amps] tube replacement ? (score: 1): Author: Dennis12Amplify@aol.com; Date: Wed, 19 Nov 2003 05:04:01 EST; ^I don't know where you got your peak emission numbers from, but the characteristic curves published by Eimac for both tubes show Ip as high as 2.2 amperes. ^ The only difference is that the 4-400A n; /archives//html/Amps/2003-11/msg00262.html (10,125 bytes)
7. Re: [Amps] tube replacement ? (score: 1): Author: R.Measures <r@somis.org>; Date: Wed, 19 Nov 2003 08:32:25 -0800; close to ** With the screen at RF-ground, there is no RF potential on the screen. RF-ground can be either connecting the screen direct to chassis-gnd (tetrodes with handles), or bypassing the screen; /archives//html/Amps/2003-11/msg00281.html (12,648 bytes)

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