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Hi again George,
    I have been checking a Tech America electronic parts book I had laying
around. They have 3  different 10 volt regulator listed.  from 30 to 75
cents in a small transistor looking sizes to-226 case to a to-220 larger
like a driver transistor with a heat sink type case.  cat#900-4498 or mfr.'s
# 78L10clp is  about  1/4 inch diameter  roundish 3 legged  case.  cat#
900-4499  mfr.'s # 78m10ckc  this is packed in a 3 legged  driver transistor
case ( flat and can be used with a heat sink in high current applications).
The latter one is listed in the  ecg  and nte master replacement guides  for
semiconductors so it would be available at any fleps. ( friendly local
electronic parts store).  I don't have any experience with these 10 volt
semiconductors regulators  however they both say they require no external
components, I assume  you put an unregulated + voltage and you will get your
desire 10v out.   You will need to make sure and make the correct  wiring of
the  regulator pins to the  ones on your circuit board.   Tech America phone
is  800-813- 0087

Darrell Boehler
Makanda Illinois

Ps. This seems like a better solution than the variable LM317 I mentioned in
the previous post.