If you are using the reel to reel as a signal processor and will then go back into the digital domain then you can use anything if you like the way it affect the sound. If you actually intend to make vinyl records from you analog tape then you will need to get something much, much, much better. If you want a tube machine look for an old Ampex. If solid state is OK then find a Revox or Studer. As soundguruman says above condition and price will be a big factor.