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6550/KT88/KT90 variants in Audio Research VT50/100

There have been some posts here on the subject but nothing very complete. I just bought used AR VT50 and enjoy it alot (and am considering getting a VT 100 Mk2 or 3 soon). I have read that the SEC 6550 is used by AR and is a good one, but from my experience with 300B Single Ended amps I would like to consider some power tube rolling in these amps - would appreciate thoughts on the other available variants (Sovtek 6550, ElectroHarmonics KT88, etc etc) and how well they work in the ARC amps... thank you in advance...
128x128jjss49
arcl60
24 posts
 
Hi,
I retubed recently an Audio Research VT200 with KT88 EH without any issues. I used to have also good experience in the past with Classic 60 amplifier (i had 2) with Svetlana SV-6550c and the other one with 6550 EH.
I heard also that the Svetlana (SED) KT88 are working very nicely as well, you should be able to plug into your VT50 with no issue
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