Tubes for my Mac's 275....NOS or just used?

I've purchased the majority of my NOS tubes on eBay, or from eBay contacts over the last 5 years. All the purchases(probably 40+) were excellent, but for one(if you e-mail me, I'll let you know his user name). I got four counterfeit Telefunkens from him. Anyway- The majority of tube sellers on the 'Bay are upright and knowledgable(especially the German ones). You just have to know the right questions to ask to find them. Don't buy anything from those sellers in Asia. they are expert counterfeiters. If you visit here, you'll find a comparison chart that indicates what kind of sound to expect from various 12AX7s: (https://www.tubeworld.com/12ax7.htm) The flavor of the 12AT7s manufactured by the same companys will be similar. If you like transparency, lack of colorations/microphonics, no phoney mid-range warmth: try the Siemens and Telefunkens(from the 60's).

Nsgarch: It probably wasn't a fair statement about Ebay junk..I have done many good tube deals on Ebay..My point was for a newby or Someone that might seem new to the NOS scene,I think it would be the smart thing to buy first from a relaible ( but more expensive ) tube dealer,thus having a better chance of getting exactly what he might think he is getting..I just think there is a higher percentage of satisfaction that way ..As you did mention.The best thing any potential tube guy can do is " his or her Homework " ...I know we all have put our time in and it does pay off down the road.........

I have purchased tubes before (from Andy) etc. and I do understand the meaning of NOS. However, a big thank you from me for your help.
I would like try to keep the cost down so I though going to e-bay may be good.
If I do, sightly used is OK? I would also think so...right?
Any of you have success with anyone in particular on e-bay? In other words...are there any regular tube dealers on e-bay.

P.S. Neil, I am getting there...(slowly).

I just bought 4 new Telefunken 12AX7's at Ebay for $164.00. That's $41.00 apiece. I've seen current production 12AX7's for that much.

I've had very good luck with Ebay, look closely at product description and seller feedback.

Thanks Albert...in particular what should I be looking for in a used (or even NOS) tube Telefunken?

Please, all respond if you can offer advice.

Tks!

Rick (RWD)