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How to do tubes up grade in a AR ref 1 preamp?

Wanted to up grade my preamp with all NOS tube but the original tubes was marked from V1 to V8 respectively to coordinate 8 sockets on the board.
After replaced with all NOS tubes, when cranking up the volume there was a distortion on one speaker.
what is the proper way to replace tubes? Anybody could help?
Thank you,
danon426
infection's avatar
infection
808 posts
 
Which tubes have you installed? 
danon426 OP
1 posts
 
I have replaced all of the 8 tubes with NOS.
jmcgrogan2's avatar
jmcgrogan2
6,346 posts
 
It sounds like you have one (or possibly more) bad NOS tubes in that channel.

So, you have (4) 6922's in each channel, just go down the line and switch one set of tubes at a time until you find that the distortion switches to the other speaker. Then you will know which tube is the bad tube, and replace it.
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