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I was working at A.R.C. at this time and I remember...

63.52.38.58

that the KT-90 was the standard output tube for all their power amps. That is until the embargo ended their import into this country. The word we got was that VTL (Vacuum Tube Logic) was keeping all remaming stock for themselves, since Mr. Manley was the one who had designed the tube and, as such had some control over who got what.
I do recall a high degree of stress at A.R.C. during this time, as an adequate substitute was sought out. Enter the Sovtek 6550. These tubes proved to be consistantly reliable and, more importantly were available in large quantities.
While no one at A.R.C. ever came right out and admitted (that I was aware of anyway) that the 6550 was not as good sounding as the KT90, you kind of got the feeling from the engineering department that this 6550 was sonically, the second place tube. Whatever the case it was vital, for the continued production of the tubed power amps, to have a steady source of output tubes.
I don't pay any attention to the activities at A.R.C. anymore but I'll bet if these new KT90's are as good as you say, it won't be long before they find their way back into the A.R.C. parts room.


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