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<DIV>There are three types of head pre-amps. </DIV>
<DIV> </DIV>
<DIV>trimmer used with the VR-1100 and 1000. This has a BLUE label</DIV>
<DIV> </DIV>
<DIV>Transistor Pre-amp for use with the VR-1200 signal system. This has a
RED label.</DIV>
<DIV> </DIV>
<DIV>Nuvistor Pre-amp for use with the VR-2000. This has a GOLD
Label.</DIV>
<DIV> </DIV>
<DIV>The last two are easily identified as the VR-2000 used a cable that went
into the right end of the head. This cable provided the power etc. to the
pre-amp. The VR-1200 head has a rectangular insert that is held in place
to fill that opening. No cable was used as all power came from the head
connector in the base of the head. All of the modules can be interchanged
by unscrewing it and replacing it with the appropriate module. But this
really never happened in the field.</DIV>
<DIV> </DIV>
<DIV>There are part numbers that can be used to identify each head, 10 mil, 5
mil, pre-amp module, ball or air bearing, etc. I just don't have that
information at hand right now. Maybe I can find it.</DIV>
<DIV> </DIV>
<DIV>Chris Hill</DIV>
<DIV>WA8IGN</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 11/20/2014 10:36:24 A.M. Eastern Standard Time,
quadlist@quadvideotapegroup.com writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2
face=Arial><BR><BR><BR>Hello Don,<BR>I have never been able to compare the
VR-1100 and 1200/2000 heads so <BR>what is the identifying difference that
you're talking about with the <BR>preamps? How can it be seen
externally?<BR><BR>Thanks,<BR>Roger<BR><BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>