Bring my own preamp to an amp demo?


I'm going tomorrow to demo a Bryston 4B3. I have a PrimaLuna Evo 300 preamp and Harbeth 30.2 XD speakers. The dealer suggested that I use a similarly priced preamp that he sells, but if I want to hear the amp with my specific preamp and the speakers I own (which he sells, and I bought from him) I need to drop it off when he opens and come back later because he has other appointments booked and needs time to connect my PL preamp, and maybe (I'm guessing) get it warmed up. I'm also going to listen to a BAT VK-56SE, and he suggested I keep an open mind and listen to an Einstein Integrated amp and thinking about selling my PL Evo 300 preamp. He wants me to have an open mind, and said he has a lot of customers that like and bought the Einstein with Harbeths. He also has an Audio Note amp demo for me to listen to as well. He's not a fan of PL, but is happy to work with me.
Bring my preamp or not?
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He's not a fan of PL, but is happy to work with me.
Bring my preamp or not?

I wouldn't expect a dealership to be a fan of a line they don't sell. Even leaving the economics aside, they may not have heard many of them.

At your level of audio system, you need to hear the 4B3 with the gear it'd be used with. No question about that. Whether that's at your own home or at the dealership first depends on the dealership's policies and your relationship with them.

Any sale should be contingent on extended home audition. If the dealer resists, remind them that Audio Advisor will give you 30 days to decide. Locals should be able to do as much for you as the mail-order guys, for heaven's sake.
Thanks for the input, keep the comments coming. Audio Advisor will take the return like you said, but if I did return the amp it will cost a couple of hundred dollars to do so. Yup, I know, it's the cost of making a decision I will live with for a long time.
Bring your preamp, and your cables, and maybe even your source if possible and if the dealer doesn't carry it.

If you like it, insist on at least a weekend demo with the store demo amp (already broken in).  Offer to have the dealer put a hold on the funds on your credit card,  pretty standard procedure for this sort of thing.

You need to be able to hear it in your room if you're dropping that kind of money.