[AMPS] Heath HA-10 Grid Bias and Resting Plate Current

[Mark S Graalman]

 Hell no! a positive voltage to the cathode, or a negative to grids!

Mark  WB8JKR


On Fri, 5 Nov 1999 18:05:23 -0500 "Mike Sawyer" <kc4slk@csrlink.net>
writes:
>
>Bill,
>    I used to have a Warrior Amp. If I remember correctly, you had to 
>apply
>"POSITIVE" bias to the grids when in  receiving mode. This cut down on 
>noise
>being induced into the receiver. The resting current is just that. 
>When the
>HV switch is "thrown", your Ip should show "approximately 100ma with 
>"NO"
>signal or drive applied.
>    I hope I'm understanding your problem correctly. If not, please
>disregard!
>    Mike
>    W3SLK
>
>-----Original Message-----
>From: Bill Smith <shadow1@jnlk.com>
>To: amps@contesting.com <amps@contesting.com>
>Date: Friday, November 05, 1999 4:46 PM
>Subject: [AMPS] Heath HA-10 Grid Bias and Resting Plate Current
>
>
>>
>>I'm confused.  I've installed a Negative Bias supply in the amp and 
>am
>>supplying about -100vdc to the 811A grids.  The plate current as 
>indicated
>>on the meter is still 100ma.  If I remove the negative bias from the
>>grids(ground it out) the plate current increases to about 120ma.  The
>>manual says the "Resting Plate Current" is supposed to be 100ma.  In 
>the
>>troubleshooting section of the manual one cause of improper resting 
>plate
>>current was noted as not grounding the bias terminal on the rear 
>apron,
>>effectively removing the negative bias. I did this and the plate 
>current
>>went up to 120 ma from 100ma.  My question is:  Is the HV inducing 
>the
>>resting plate current and can not be removed by apply a negative bias 
>to
>>the grid?  I'm learning the hard way, trial and error.
>>73,
>>Bill KO4NR
>>
>>
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>
>
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