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Re: Why do some audiophiles prefer audio research vt100 mkII over vt100 mkIII ???

Posted by AbeCollins on May 31, 2003 at 08:48:35:
From the Audio Reasearch website:
"Like its more powerful sibling, the MKIII's input stage utilizes direct-coupled JFETS for ultra low noise, and is followed by a 6H30 driver/gain stage, capacitor coupled to a 6H30 follower, driving two matched pairs of 6550C output tubes per channel. The conservative 6H30 driver-follower circuit will help prolong the life of the 6550Cs, and the 6H30 is rated to handle higher currents than the previously used 6922, so it has lots of safety margin for even better reliability. (The 6H30 twin triode is a Russian military tube in current production, with an estimated service life of up to 10,000 hours.) There are now four internal bias adjustments-up from the previous two- to allow more accurate DC balance adjustments for the output tubes. The line fuse has been increased to a 7 amp in 120V units (6.3 amp in high voltage units), allowing the MKIII to handle musical dynamics with greater ease."
The VT-100mkI and mkII didn't use JFETS (transistors) in the input stage and they used 6922 tubes instead of the 6H30 currently in use. The LS25mkII also uses JFETS while the earlier models where all tubes. Some feel that the all tube versions had a better sound to them than the current models. Audiophiles will often advertise their earlier models as sounding better than the newer ones but this is just a 'selling point' and is highly debatable and a matter of personal preference.