Does anyone have a Threshold T3 preamplifier manual?

You could keep watching until they come up for sale, and write the sellers before they are sold offering to buy a copy of the manual.

They would need to go somewhere like Staples and wait for a copy to be made, so it’s their time you are compensating for.

Here’s one now

https://www.usaudiomart.com/details/650015063-threshold-t3i/

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usaudiomart and others have wanted sections, you might get lucky. ask for original OR copy.

https://www.usaudiomart.com/classifieds/all/?filter=WANTED

95 % of those sold are without a manual. That one too.

Good idea on the wanted section, thanks!