implementation

Tubes Asylum

Questions about tubes and gear that glows. FAQ

In Reply to: I looked at it again and . . . posted by John PA on June 21, 2012 at 17:07:51:

Mine has 24, 2db steps. Feeds straight to the SET 5687/6b4g power amp.

An AVC is great in that it's output impedance is the same as the source when turned all the way up and the output impedance goes down as you turn it down.

At -6db you're at 1/2 the winding so the impedance ratio is 4:1

If your source is 1k ohm, the output impedance of the AVC is 250 ohms.

If the input impedance of the power amp is 100k ohms, the source "sees" 400k ohms.

It's a win, win.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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Parts Connexion

Follow Ups Full Thread

Topic - more on Hk W-5m restoration, passive preamp? - PeterI 13:41:25 06/19/12 (6)

RE: more on Hk W-5m restoration, passive preamp? - Tre' 13:32:22 06/20/12 (5)

That is a pretty good price . . . - John PA 15:05:09 06/20/12 (4)

RE: That is a pretty good price . . . - Tre' 08:23:22 06/21/12 (3)

I looked at it again and . . . - John PA 17:07:51 06/21/12 (2)

implementation - Tre' 18:10:26 06/21/12 (1)

It is nice to see your CL string in . . - John PA 21:47:22 06/21/12 (0)

Follow Ups

implementation - Tre' 18:10:26 06/21/12 (1)

It is nice to see your CL string in . . - John PA 21:47:22 06/21/12 (0)

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