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Re: [Amps] Measuring Grid Current in GG Amp

To: "Charlie" <>, <>
Subject: Re: [Amps] Measuring Grid Current in GG Amp
From: "Jim W7RY" <>
Reply-to: Jim W7RY <>
Date: Wed, 11 Nov 2015 21:40:03 -0800
List-post: <">>
Why don’t you want to float the ground?

It's easy to protect circuitry with a properly connected diode along with the resistor between B- and ground.

Enlighten us please Charlie.

Jim W7RY

-----Original Message----- From: Charlie
Sent: Tuesday, November 10, 2015 6:33 PM
Subject: [Amps] Measuring Grid Current in GG Amp


In a GG amp, suggestions on how to measure Grid current WITHOUT the typical
semi-floating B-.

Using a SMPS. Plate current and Voltage are present as 0-5 volt full scale.

1) Measure Cathode current across Rk, and subtract Cathode I from
Plate I in an op amp to derive Grid I?

2) Untie the grid from physical ground, RF ground with caps, measure
Grid I across a small resistor?

3) ?

Thanks for flexing the gray matter.

73 Charlie N6CFH
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