This reference, page 3 onwards, may explain what everyone means.
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
>From: Amps [mailto:firstname.lastname@example.org] 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
> 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
>On Mon, 11/28/16, Jim W7RY <email@example.com> wrote:
> Subject: [Amps] 8877 Grid Connection DC or Not
> To: "AMPS" <firstname.lastname@example.org>
> 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
> Amps mailing list
>Amps mailing list
Amps mailing list