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Total 8 documents matching your query.

1. [Amps] 2 x 4-250A Amp (score: 1): Author: "Mark Kachel" <kachels@wi.rr.com>; Date: Fri, 15 Dec 2006 14:56:36 -0600; I bought a home brew amp with 2 x 4-250A tubes on ebay. Nicely built but it is grounded grid. The filament transformer is 10 volts with no center tap and the two five volt filaments are wired in seri; /archives//html/Amps/2006-12/msg00103.html (7,134 bytes)
2. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 17 Dec 2006 10:28:13 +0100 (CET); My experience with grounded cathode, passive grid, 4-250As - for what it's worth. I found better linearity running in AB2, with some NFB from 10 ohm resistors, un-bypassed RF wise, in the filament ci; /archives//html/Amps/2006-12/msg00111.html (10,461 bytes)
3. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: "wc6w@juno.com" <wc6w@juno.com>; Date: Sun, 17 Dec 2006 17:41:15 GMT; Hi Mark, Your suggested meter connection will be fine. Are you changing from cathode driven to grid driven? You may retain the current drive configuration and run in AB-1 just by properly biasing the; /archives//html/Amps/2006-12/msg00115.html (9,172 bytes)
4. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 17 Dec 2006 18:13:15 -0500; The filament transformer is 10 volts with no center tap and the two five volt filaments are wired in series. The B- is thru a meter to a resistor across the filaments.The article with the amp suggest; /archives//html/Amps/2006-12/msg00120.html (9,102 bytes)
5. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: "Hsu" <Jbenson@sohu.com>; Date: Mon, 18 Dec 2006 09:38:16 +0800; Hi, I just rebuilt a junk TL922, I use a pair Chinese FU500F( same as 4x500A) replace the 3-500Z( worked in GG service) , all grids are grounded I replace the origional fan with a noisy AADA fan , bu; /archives//html/Amps/2006-12/msg00123.html (7,383 bytes)
6. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 18 Dec 2006 06:52:58 +0100 (CET); regulated. It also needs a shunt regulator, or a series regulator with a heavy bleeder. It also needs current limited.< I've never seen negative screen current with 4-250As (as opposed to the 4CX, wh; /archives//html/Amps/2006-12/msg00126.html (8,185 bytes)
7. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: "Hsu" <Jbenson@sohu.com>; Date: Mon, 18 Dec 2006 14:35:31 +0800; Sorry, Peter, It is QB3.5/750, not TB3.5/750,I make a mistake.Its datasheet was here: http://www.g8wrb.org/data/Philips/QB3.5-750.pdf.. TL922's output power is 1kW, I think in this level the anode di; /archives//html/Amps/2006-12/msg00128.html (7,521 bytes)
8. Re: [Amps] 2 x 4-250A Amp (score: 1): Author: Ian White GM3SEK <boards@ifwtech.co.uk>; Date: Mon, 18 Dec 2006 22:43:41 +0000; W8JI replied: Sorry to have missed the start of this thread (broken phone line). When you look in more detail at the current requirements for a screen regulator, you'll find they are much higher than; /archives//html/Amps/2006-12/msg00162.html (9,075 bytes)

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