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Audio Research VT100 MKIII Tube Replacement

Hello,
I recently bought a second hand VT100 MKIII. I will replace amp's all 12 tubes. 4 pairs are 6550 I already ordered but I am confused about should I replace them with  4 single 6H30 tubes. Should I replace them with 6H30Pi or they have to be identical as 6H30.
Thanks !David.
davidbarac

Showing 1 response by davidbarac

davidbarac OP
3 posts
 
Thank you for your fast response. Database of Audio Research says; VT100 MKIII: (4 matched pairs) 6550C power output, (4) 6H30 driver. I have ordered 4 matched pairs of 6550 tungsol however I am not sure about 6H30s. I wonder what are the difference between 6H30 and 6H30Pi.
Thanks !
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