AVC + what buffer to use?

discussion of magnetic volume control design for both line and speaker levels.

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noviygera
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Joined: Tue Apr 08, 2014 12:14 am

AVC + what buffer to use?

Post by noviygera »

Hi.
I was lucky to purchase a used Intact bottom of the range AVC, the one with less steps. Perfect way into the AVC world, at least for me :)

What's a good, solid state buffer to follow the AVC? Maybe a proven solution that degrades the sound the least amount? Tubes is an option but with my lack of skills I was thinking to start with ss.

Appreciate any advice. Excited to start soldering the AVC :)
best regards,
Herman
dave slagle
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Post by dave slagle »

a buffer is the last thing I would follow the AVC with. The absolute worst case situation happens at full volume where the output Z of the autoformer is that of the source driving it. As you attenuate the output Z gets lower and at -12dB the output Z is 1/16th that of the source.

my advice it so build it and listen to it "naked" and then if you get the itch try a buffer after it. If a buffer must be used I would put it before the autoformer to deal with the chance of a overly high output impedance source.

dave
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noviygera
Posts: 5
Joined: Tue Apr 08, 2014 12:14 am

Post by noviygera »

Dave,
thanks for the recommendation. Will try that.
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