New tubes or new preamp?

I got a set of tubes from ARC and they were so microphonjc I Sent them back. Really want to know if spending money on an older per is worth it versus a new one.

Good advice all...I've recently upgrades my speakers to Magnepan 3.7's, and bought a Magtech amp. Still not getting the sweet sound I'd like. As I tried new tubes from ARC and still wasn't where I'd like to be, thought either a tube upgrade or a new tube pre might be the way to go..I can't audition, due to the fact there are no dealers anywhere near, so I"m looking for some guidance for those here who have listened to a lot of gear I can't.

I'm prepared to spend some money if the return is there, but want to make sure the difference in expense is worth it....
Thanks for your input...

Russ69, What did you get to replace it?

I've been running direct from my Oppo 105 for a bit, as I returned the tubes ARC sent , and just have an old set of Sovteks that are not good, to say the least. Will have to get a decent set of tubes so I can sell the LS15 in good conscience, and give it a listen at the same time....speakers are starting to settle in and the sound has improved recently...just need to decide on a preamp....will probably try to get a used one and , if it doesn't do the tick, resell t and try something else...the joys of no decent local dealers!..