Good matching tube preamp for my rb-1090 ??

Hi everyone, I am looking to find a good tube preamp for my amp. The problem I am having is finding one with a compatible output impedance. The reason why I say this is because I do not understand preamp output impedance or amplifier
input impedance, and how they should match.
The input impedance on my amplifier is 37 ohms, and I am using 12 foot interconnects from my current preamp.
What brands of tube preamps should I look at that will work? Thanks for any
helpor feedback.
I don't believe you have the input impedance of your Rotel amp correct. Maybe 37K ohms. From the Stereophile measurements:
The RB-1090's input impedance measured 33.2k ohms (47.9k ohms balanced).
Assuming you use the 10X rule of thumb, you'd want a preamp with a worst case output impedance (not the "nominal" value reported by the manufacturer) not greater than 3300 ohms (4700 ohms balanced). Stereophile always reports the worst case output impedance on preamps that JA measures, so their archives are a good resource.
There's a TAD-150 for sale here on the 'Gon. Nice piece for under a grand. What's your budget?
Thanks Bob, i'm just starting to learn about impedance between components. The way you make it sound, MOST tube preamps should work ok.

Ehaller, yep, my budget is under a grand LOL unfortunately. I'll check out
the TAD. Thanks
Yes, I think your Rotel amp has a high enough input impedance, especially the balanced input (which I would recommend using), that many tube preamps should match well enough.
Bob, not sure how much experience you have listening to the RB-1090 but even though it has XLR inputs it is not a balanced circuit. Not that there's anything wrong with that-I'm back to the RB-1090 after trying much higher end stuff and am very happy with it.
The RB-1090 may not be a balanced design, but it seems its balanced input uses a differential amplifier since its impedance is twice that of the unbalanced input. So one will get the benefit of common mode noise rejection by using the balanced input. From the Rotel web site:
High-end equipment often provides both connection types, as found on Rotel amplifiers RB1090, 1080, and RMB1095, as well as the RC1090 preamp. Balanced connections cancel any noise injected in the line and may provide better sound than RCA connections.
Bob, interesting but over my head technically. I remember and have copies somewhere of technical portions of reviews of the amp pointing out that while the XLR connections were there, they converted right back to single ended internally. As a result I never tried connecting with XLR cables. Maybe I should.