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KT120 in Audio Research Pre-amp?

I recently exchanged my totally worn out 6550C's for KT120 tubes from Tung Sol in my VT200 MkII. It required a small modification, I'll spare you the details, but it was a succesful operation, quite happy with the sound of the KT120's.
I have some spare KT120's and I was wondering.... is there any danger in replacing the Svetlana 6550C of my Audio Research Reference 3 for a KT120 tube? Since it is a risk-free replacement for most ARC-poweramps, I was wondering if this would be the same risk-free replacement for their pre-amps like a Ref3.
128x128midcall
lloydelee21
1,202 posts
 
Email ARC...should be a quick answer. The KT120 can draw slightly more current (i thought)...so just need to be careful.
roscoeiii's avatar
roscoeiii
1,155 posts
 
Yes, contact ARC.

Why ask here when you can talk with the company that built the amp?
spinaker01
491 posts
 
Talk to Calvin at ARC but I believe I heard that this is one place the 6550 should remain in place and NOT use a KT120. (Love them in the VT100 amp though!)
midcall's avatar
midcall OP
2 posts
 
Manufacturers normally prefer to be on the safe side and and are concerned less about what actually sounds best. That's why I ask the question here, hoping to get a more objective opinion. I will ask it ARC as well of course, but wanted to drop the question here first.
hifigeek1
770 posts
 
Do NOT use a KT-120 in the power supply of an ARC preamp. Use the 6550 only!
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