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RE: Clean and simple!

Posted by drlowmu (M) on November 23, 2014 at 10:47:05

In Reply to: RE: Clean and simple! posted by maxhifi on November 22, 2014 at 20:57:45:

Kiss rules !! Nice thread.

I wonder if it would be a good idea to use a grid choke to ground, on the 2A3's grid, so as to avoid a high value resistor there ?

My original audio mentor, Bob Fulton, HATED the usually-used 100K Ohms and above Ohmic value at that spot, preferred to have 20 K as grid-to-ground resistance on a 2A3's grid, to "put the grid in control" or to " center " the grid and the tube's operation.

Of course, this took a tremendously powerful driver stage to pull a 20 K grid to ground. I built it!! The sonic results of lowering this grid-to-ground resistance was a more engaging music presentation. I recall "sensing the musicians in the room, playing for ME" more-so, as I went lower in value there.

It was better to hear !!

Now a well-wound quality grid choke will allow you to have, what the EEs call a high AC impedance I believe, and a superbly-low DCR to ground, that the 2A3 grid will "love" to respond to, musically.

FWIW : Fulton would use terms such as " Puts the music grid in control of the tube, or CENTERS it on the music signal ".

No flames requested, this is a serious post by me. Good input by well meaning people is welcomed, encouraged. Open to discussion, positive discussion.

Jeff Medwin

Edits: 11/23/14

This post is made possible by the generous support of people like you and our sponsors:

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