I was assuming that the valve seats which John Ravert was seeking in
the 20.03.07 MMD were the bakelite seats inside Wurlitzer valve blocks
(which Wurlitzer called Jameson unit blocks, naming them after their
inventor).  In the next MMD (20.03.08) Don Teach names Player-Care as
a source for the metal valve cover that sit on top of the valve block.

Which valve seat is it that John Ravert wants?  I don't know of any
present-day source for the bakelite bottom seat.

Matthew Caulfield
Irondequoit, New York