FS: Intact Audio (Slagle-former) Autoformer Volume Controls (AVC) - diyAudio
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Old 3rd January 2011, 07:46 PM   #1
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Default FS: Intact Audio (Slagle-former) Autoformer Volume Controls (AVC)

For sale is a standard pair of the Intact Audio Autoformer Volume Controls. Comes with a switch. These have been stacked for full inductance, but I'll restack differently if you like.

More info here.

$160 shipped in the U.S. (no PayPal fees).
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Old 5th January 2011, 07:44 PM   #2
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Bump
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Old 7th January 2011, 08:59 PM   #3
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Bump again -- will consider trade for Sennheiser HD-600's or Beyer DT880 (32 or 250 ohm versions).
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Old 7th January 2011, 09:18 PM   #4
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would you happen to know the inductance, bandwidth, and current rating of these?

I have some test gear that uses an autoformer. regular wall volume control autoformers do not have enough inductance.
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Old 7th January 2011, 10:37 PM   #5
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Quote:
Originally Posted by speakerfritz View Post
would you happen to know the inductance, bandwidth, and current rating of these?
The lams can be restacked in different patterns. This changes the inductance -- while the higher the inductance, the lower the fidelity, this is relative, they work and sound great at all levels.

Anyway, cores are 80% permalloy (nickel) and butt stacked are ~20H (impedance=2K5 @ 20Hz, and over 100K at 1KHz) and fully interleaved are ~170H (over 20K at 20Hz and over 1M at 1KHz).

Frequency response on the low end depends on how they are stacked, and is over 200K on the high end.

Current rating is ~0. If your offset is much more than a few minivolts, you'll need a DC blocking cap.

Some details: intact audio

Last edited by dsavitsk; 7th January 2011 at 10:39 PM.
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Old 10th January 2011, 01:37 AM   #6
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Old 10th January 2011, 04:19 AM   #7
ludcam is offline ludcam  United States
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Default I would like the autoformers..

Any chance you have a box for them? I would be willing to pay for something with RCA jacks...just have very little time to drill holes etc.
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Old 10th January 2011, 05:43 AM   #8
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Originally Posted by ludcam View Post
Any chance you have a box for them?
PM sent
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Old 14th January 2011, 08:12 PM   #9
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Still available.
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Old 14th January 2011, 09:34 PM   #10
DrRick is offline DrRick  United States
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Hi,
The link you provided to Dave's site shows several attenuators. Which are these?
Thanks in advance.
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