2. amps-preamps
  3. 1351603120

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
hifigeek1
770 posts
 
Do NOT use a KT-120 in the power supply of an ARC preamp. Use the 6550 only!
lloydelee21
1,202 posts
 
Manufacturers have long-term reputations to protect if they are reputable manufacturers. But if there is no safety risk to the unit, they usually tell you to go ahead an experiment...in the case where a manufacturers says dont do it...that they did not design the unit to increase the draw necessary to drive the KT120 (which draws i thought higher current slightly than 6550)...i would take that advice and not risk it.
microstrip
180 posts
 
No. In NO case the 6550 should be replaced by other type of tube in the ARC power supplies. Even the new REF250 still has the 6550 in this position.
lloydelee21
1,202 posts
 
Microstrip! Barely recognize you over here, relative to WBF! ;) May PM you over there for some advice...
hifigeek1
770 posts
 
I am a warranty repair station for ARC. KT120 in the regulator is no bueno...
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