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<DIV>I did some more research. The first TRTs had a tube type Proc
Amp. It appears from the picture that it was a version of the TA-9 Stab
Amp. This unit does not have any real color controls. The only one
is the Chroma level control. There were other things that I have
noticed. Early machines did not have frame pulses. They had field
pulses. This was changed about 1960 when the SMPTE standard was
adopted. The early modulators had a different set of frequencies for
color. Then Low Band color was standardized. It has been interesting
to look at the instruction book. The only thing that is missing is the
capstan servo. But all the rest is there. I see the differences between
the A and B versions. A lot of improvements. Some are in
the RF path but control, servo, power supplies, and MDAs appear to have been
improved. </DIV>
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<DIV>Chris Hill</DIV></FONT><br/><font style="color:black;font:normal 10pt arial,san-serif;"> <hr style="margin-top:10px"/>Access 350+ FREE radio stations anytime from anywhere on the web. <a href="http://toolbar.aol.com/aolradio/download.html?ncid=emlcntusdown00000003">Get the Radio Toolbar</a>!</font></DIV></BODY></HTML>