AMC CVT 1030S is a good low-cost tube preamp with tone controls. Click the link and scroll down for more info:
http://www.amchome.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=AO&Category_Code=Preamplifiers
Other than that, you could get a Z-man ASE tube line buffer. It uses a single 12AX7 tube for both channels and you could tube roll (but no tone controls).
If you like the Z-man idea, I have a good one that I may sell. You can e-mail me privately if interested.
http://www.amchome.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=AO&Category_Code=Preamplifiers
Other than that, you could get a Z-man ASE tube line buffer. It uses a single 12AX7 tube for both channels and you could tube roll (but no tone controls).
If you like the Z-man idea, I have a good one that I may sell. You can e-mail me privately if interested.