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1. [AMPS] 4CX800 Idle Current a bit high (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Wed, 31 Oct 2001 08:50:54 -0500; I have a 4cx800 that has 350volts screen voltage, -56volts grid bias and 2200volts plate voltage. The specs say it should idle at 150ma. It idles at 200ma. My question is: What is the preferred volta; /archives//html/Amps/2001-10/msg00505.html (7,175 bytes)
2. [AMPS] 4CX800 Idle Current a bit high (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 31 Oct 2001 13:49:20 -0000; Whatever it takes. The exact voltage will depend on the gm of that particular tube: I'd expect somewhere around the -60 to -68 volt range. You adjust the bias to get it right - unless you've a number; /archives//html/Amps/2001-10/msg00506.html (7,480 bytes)
3. [AMPS] 4CX800 Idle Current a bit high (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 31 Oct 2001 06:23:30 -0800; Peter is right on. Since the grid takes very little current, a poteniometer is used to adjust the bias voltage to the exact voltage. Usually you will have a higher negative voltage that is tapped by; /archives//html/Amps/2001-10/msg00507.html (7,600 bytes)
4. [AMPS] 4CX800 Idle Current a bit high (score: 1): Author: 2@vc.net (2); Date: Wed, 31 Oct 2001 07:50:55 -0800; / In Class AB1 gtid-driven service, the screen and/or the grid potential can be used to set ZSAC. To take full advantage of the tube's emissive ability, the screen needs to operated at max rated V.; /archives//html/Amps/2001-10/msg00508.html (7,567 bytes)
5. [AMPS] 4CX800 Idle Current a bit high (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Wed, 31 Oct 2001 11:40:53 -0500; I'd put a 20-25 ohm 20 watt non inductive, non bypassed resistor in series with the cathode. It'll lower your idle current and provide neg. feedback. Mark WB8JKR -- FAQ on WWW: http://www.contesting.; /archives//html/Amps/2001-10/msg00512.html (8,010 bytes)

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