The VT100MKII comes from the factory with 8 Svetlana 6550C power tubes and 8 Sovtek 6922 driver tubes.

I purchased all of my tubes from  They have an outstanding website and excellent service.  For the driver tubes I decided to use JAN-Philips 7308 Low Noise tubes in place of the stock Russian Sovtek 6922's.  The 7308's are a rugged military replacement for the 6922 tubes.  JAN means "Joint Army Navy" and the tubes were made by Philips.  I used Russian made Svetlana 6550C power tubes which is what the Audio Research factory uses.
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