Reg, FWIW here's what I would do with a $500 budget;
1) Get an EV RE15 for home recording. (about $100-130 used for a nice one)
2) Choose between the VTB-1, DMP3, or new
Joe Meek 3Q
www.pmiaudio.com will show the Studio Projects and Joe Meek lines.
3) IF you can record in a good sounding room, add the EV 635a omni
to your shortlist. They run about $70 used in very good condition.
4) Go to
www.realtraps.com and check out their "MiniTraps".
IIRC they cost about $150 for the pair, and will break up
standing waves, along with better acoustical control.
Ethan Winer has his own forum at
www.musicplayer.com
where you can also ask him questions. He's a nice guy
who's a well known pro authority on acoustical design.
5) Your reel to reel with already have a "softer" sound than low
and mid-level digital recording systems, other things being equal.
The quality (or lack thereof) of the room sound again, will be a prime
concern-after the skill level of the musician themselves.
The EV 635a's were used on many major classical recordings during the 60's
and 70's. So if they're good enough for a pair to record an ENTIRE orchestra,
they just "might"

be fine for recording one violin.
Just go to ebay and get one. If they have a picture, check for dents in the
grill. 635a's lose some top end if they've been dropped nose first.
Otherwise, they are more durable than just about any mic on the planet!
The starved plate "tube" aka toob mic pre's at Guitar Center don't really sound
like a professional tube mic pre, like a Peavey VMP2 (on up).
Expect to pay from $800 on up used for a mic pre like that.
The budget toobs add a dirtier/grittier tone vs. one of these units.
You're better off either getting a "clean pre" (DMP3 or Joe Meek 3Q),
or one where the toob feature is optional and not in the main output always
(like the VTB-1).
The Yamaha and Behringer mixer pre's will be a step down from the ones suggested above, and will be less "life-like" in their sound imaging.
Chris