Amps
[Top] [All Lists]

## Re: [Amps] 8877 Grid Connection DC or Not

 To: Jim W7RY , AMPS Re: [Amps] 8877 Grid Connection DC or Not Radio WC6W via Amps Radio WC6W Wed, 30 Nov 2016 17:34:40 +0000 (UTC) mailto:amps@contesting.com>
 ```Hi Jim, Ah... the unknown factor. You could include an (optically?) isolated plate current sensor and then do the math and metering at low voltage. 73 & Good morning, Marv WC6W http://qsl.net/wc6w/ -------------------------------------------- On Tue, 11/29/16, Jim W7RY wrote: Subject: Re: [Amps] 8877 Grid Connection DC or Not To: "Radio WC6W" , "AMPS" Date: Tuesday, November 29, 2016, 3:37 PM 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. Thanks 73 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 http://qsl.net/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 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ```
 Current Thread [Amps] 8877 Grid Connection DC or Not, Jim W7RY Re: [Amps] 8877 Grid Connection DC or Not, Bill Turner Re: [Amps] 8877 Grid Connection DC or Not, Radio WC6W via Amps Re: [Amps] 8877 Grid Connection DC or Not, Ian White Re: [Amps] 8877 Grid Connection DC or Not, Jim W7RY Message not availableRe: [Amps] 8877 Grid Connection DC or Not, Jim W7RY Re: [Amps] 8877 Grid Connection DC or Not, Bill Turner Re: [Amps] 8877 Grid Connection DC or Not, Jim W7RY [Amps] 8877 Grid Connection DC or Not, Jim Thomson Re: [Amps] 8877 Grid Connection DC or Not, Radio WC6W via Amps <= Re: [Amps] 8877 Grid Connection DC or Not, Gerald Williamson via Amps