Conrad Johnson Premier 140 6922 tube swapping

That probably is their stock tube of choice. Very commonly spec'd tube. They don't totally suck - in fact, when mixed with NOS tubes in my SF Line 1 they do a fine job of adding bass slam.

Only thing is there are 8 6550's!!

I believe the 140 can accept KT-120's.

Does anyone know where I could get 8 NOS Tungsol 6550 tubes?, I know it's asking alot

OP I assume your unit is stock. Given its vintage I think money is much better spent on checking out the caps and resistors and tubes in the gain and driver stage before you risk any $ going into the hands of the too many scammers selling those so called NOS power tubes out there. Bad power tubes do not contribute to noise. They just sound dull and wimpy and eventually wont bias and may pop. Noise is from components in the gain stage.