[Amps] 8877 Grid Connection DC or Not

[Jim W7RY]

Thanks Ian.. I'll add it to the several versions of your board info that I 
already have and use.

I know how amplifier metering works. This is a special application.

73
Jim W7RY


-----Original Message----- 
From: Ian White
Sent: Tuesday, November 29, 2016 12:14 PM
To: amps at contesting.com
Subject: Re: [Amps] 8877 Grid Connection DC or Not

This reference, page 3 onwards, may explain what everyone means.

http://www.ifwtech.co.uk/g3sek/boards/triode/triode-manual.pdf

That is how it's done in the large majority of HF amplifiers, and in all VHF 
triode amplifiers where a well-grounded grid is essential.


73 from Ian GM3SEK


>-----Original Message-----
>From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Radio
>WC6W via Amps
>Sent: 29 November 2016 17:36
>To: Jim W7RY; AMPS
>Subject: Re: [Amps] 8877 Grid Connection DC or Not
>
>
>Hi Jim,
>   Why not leave the grid grounded but, just measure the cathode and plate
>currents then subtract to calculate the grid current?
>
>73 & Good morning,
>   Marv WC6W
>
>http://qsl.net/wc6w/
>
>--------------------------------------------
>On Mon, 11/28/16, Jim W7RY <jimw7ry at gmail.com> wrote:
>
> Subject: [Amps] 8877 Grid Connection DC or Not
> To: "AMPS" <amps at contesting.com>
> Date: Monday, November 28, 2016, 7:00 PM
>
> Has anyone run the grid of an 8877
> not connected to ground as far as DC is concerned?
>
> 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
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