[Top] [All Lists]

Re: [Amps] 8877 Grid Connection DC or Not

To: Amps group <>
Subject: Re: [Amps] 8877 Grid Connection DC or Not
From: Bill Turner <>
Date: Tue, 29 Nov 2016 04:26:44 +0000
List-post: <">>
------------ ORIGINAL MESSAGE ------------(may be snipped)

On Mon, 28 Nov 2016 21:00:21 -0600, you wrote:

>Has anyone run the grid of an 8877 not connected to ground as far as DC is 
>I really need to meter the grid current by bypassing the grid to ground with 
>capacitors and several 10 ohm resistors in order to meter grid current. 
>Metering grid current by the CT of the filament transformer, and the – of the 
>power supply cant be done. Because the power supply – is directly grounded.
>Anyone had luck doing this?
>Thanks 73
>Jim W7RY


You might consider un-grounding the power supply if you can. It's not
a safety issue - the difference between true ground and B- is a volt
or two at most. That allows you to use the conventional grid meter
between ground and B-.  Trying to "ground" the grid with capacitors
can lead to unwanted resonances and instability as you probably know. 

73, Bill W6WRT
Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>