Looking for a tube Preamp new or used for under $2000...

Despite what you’ve been told, what specific improvements are YOU looking for?

I’ve had that setup. I’m not sure you are going to see a “huge” improvement in that price realm. I ran my A21 with both an ARC LS17 SE and and ARC SP16 both were “different” but certainly not a “huge” improvement. You can find an SP16 in your price range. The LS17 for a bit more.

Check out Aric Audio. Make a tube pre called the Unlimited. Great company (guy) to work with. 

I LOVE my McIntosh mx110z Tube Tuner/Preamp. I would replace it in a heartbeat if it died.

The z version has gone up in price, a bit over your budget max.

Earlier version, mx110 (has black horizontal volume control) is less money, also highly praised.

This early mx110 has been re-furbed, it has ink worn off the front panel, easy enough to fix with a sharpie

https://www.ebay.com/itm/363270393203



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some info about the difference of earlt and later z versions here

https://forums.stevehoffman.tv/threads/mcintosh-mx110-vs-mx110z.337718/

McIntosh MX 110 (EARLY)

http://mcc.berners.ch/tuner-pre-amps/MX110EARLY.pdf

MX 110Z (LATE)

http://mcc.berners.ch/tuner-pre-amps/MX110LATE.pdf

The way to tell the difference at a glance is the concentric on/off volume and rotary balance control on the late version; slider balance control on early.

Other refinements include end caps which are slimmer and vertically "Veed" on later version.

There doesn't seem to be much of a consensus as to which may sound better which suggests they probably sound essentially alike.

Agreed 100% with Steve, cosmetic condition is paramount; functional issues can always be tended.

A highly regarded and quintessential piece of vintage Mc. An essential for the vintage Mc collector.

I second the recommendation of Aric Audio. Great products at real human prices,and Aric is great to deal with.  However, I agree with soix,what are you looking to improve? What shortcomings are you trying to overcome?