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Re: [Amps] L4B biasing

To: "Steven Grant, W4IIV" <>, <>, <>
Subject: Re: [Amps] L4B biasing
From: "Carl" <>
Date: Thu, 25 Dec 2014 17:04:33 -0500
List-post: <">>
You just might want to look at Eimac's spec sheet.


----- Original Message ----- From: "Steven Grant, W4IIV via Amps" <>
To: <>; <>
Sent: Thursday, December 25, 2014 4:37 PM
Subject: Re: [Amps] L4B biasing

A 3-500 amp does not need bias unless it is run at 3000 volts or above. 200 mills of idling current is normal for this amp

On Wednesday, December 24, 2014 4:45 PM, mike via Amps <> wrote:

I just finished me Drake power supply. I used a Drake transformer and a doubler board with 8 caps. I have 2600 volts showing on the high voltage meter. I have eliminated all the bias circuit in the power supply that Drake used. At idle I show 200 mills of plate current. My question is should I add a bias circuit? I purchased a W4ZT board but wonder if I need it. Thanks and Happy Holidays to all.
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