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VAC 30/30 & Sophia 6SN7's

I recently purchased a VAC Ren 30/30 amp that is an incredable little amp and the best so far in my system. I decided to try some tube rolling in the front 4, 6SN7's and purchased a matched pair of the highly reguarded, Sophia 6SN7's to try out. When I install them in the inside (splitter positions) and then power up, a very loud hum is generated to the extent that I am afraid I will damage something so I shut it down. If I install them in the outside (driver) positions everything is fine and the sound is great. My question is: Has anyone experienced this? Are my tubes bad?
I do have an email in to VAC but thought I'd seek out any experiences that other, more knowledgeable audiophiles might have.
Thanks
Markus
markus1299

Showing 1 response by swampwalker

swampwalker's avatar
swampwalker
5,138 posts
 
an incredible little amp
You must be a power lifter, Markus. I thought that my Doshi/Lectron JH-50 was HEAVY until I got my Ren 30/30!! Highly recommended, as long as your health insurance covers disk surgery ;-)
I'll have to check out my Sylvanias but I will comment that the Shuguang Black Treasure 6SN7 equivalent (CV-181?) sounds pretty darn good. I have them in all 4 slots on my Ren 30/30. Not to hi-jack this thread, but has anyone tried the Shuguang Black Treasure 300bs in their VAC Ren?
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