Have you considered an Ampex 601? They were used as 
field recorders for music projects back in the day. The 
Ampex List would be a great resource for information.

http://recordist.com/ampex/

These older machines have major limitations, but it sounds 
like a interesting project.

-Jim Atkins


------
Mahern, Paul Cantwell wrote:
> 
> Hello Everyone,
> 
> I have a client that is looking for a vintage tube powered open reel tape machine that is in good enough condition to take on the road and make recordings for his next record. A full track 1/4 inch would be best. Does anyone know of someone who sells or rents these in top condition . This is a major recording artist that is looking to make a record with one microphone and a tape deck.
> 
> Very Best,
> 
> Paul Mahern