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Add-on IR Remote Volume Control

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Might perform acceptably but the performance you've paid for in the main preamplifier will obviously be limited to whatever this little gizmo spits out.

If you want a high quality remote preamp, I'd suggest a McIntosh CR7 which also has other useful features. I have one in each of my systems.

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I've considered one of the many motorized ALPS volume controls on eBay. I'm not sure that they are better, but it just seems like they might be, being a standard analog pot vs an electronic volume control. Below is one, as an example. It should only need 12V DC and four RCA jacks soldered to the board.
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In-line jobs usually sit between the pre and the power amp or sit in the tape loop. No gain, its just an attenuator. You can wind the volume way up on the preamp and cut it back with this thing.

Depending on the specifics it may or may not be audible. In the tape loop with the preamp wound way up, you may have some noise issues if the preamp itself isn't super quiet. Might work better between the output of the pre and the input to the amp if your pre is a little noisy.
 
I fitted one of these to an old Rotel amp. I wired it in place of the existing volume control which was scratchy anyway. I fitted an auxiliary PSU and I wired the board to drive a relay to switch on the amp power supplies. It worked really well. Also, with the version I had, when the power-up button was pressed it drove the volume control anticlockwise for a couple of seconds before powering the amp up.
 
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