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Re: [Amps] 8877 Grid Connection DC or Not

To: "Radio WC6W" <>, "AMPS" <>
Subject: Re: [Amps] 8877 Grid Connection DC or Not
From: "Jim W7RY" <>
Date: Tue, 29 Nov 2016 17:37:27 -0600
List-post: <">>
Marv... Because this will be a single power supply and multiple RF deck (5 or 6 of them) amplifier system for a contest station. I don’t want to use vacuum relays as high voltage switches.

Metering plate current is easy. Simply put the plate current meter (set back from the front panel for safety) in series with the HV on the RF deck.

That’s why.

Jim W7RY

-----Original Message----- From: Radio WC6W
Sent: Tuesday, November 29, 2016 11:35 AM
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

On Mon, 11/28/16, Jim W7RY <> wrote:

Subject: [Amps] 8877 Grid Connection DC or Not
To: "AMPS" <>
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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