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<DIV>The transistor record amps were introduced in the TR-70C model. The B
model still had the tubes. There was a retrofit kit offered to update your
older TR-70 to the solid state amps. </DIV>
<DIV> </DIV>
<DIV>The U of Michigan Dental school had the prototype TR-70 that was B model
with the C servo drawer. They did the retrofit of the record
amps at a later time.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV></FONT></BODY></HTML>