[QuadList] Ampex Mark 10 head differences

[Chill315 at aol.com]

There are three types of head pre-amps.  
 
trimmer used with the VR-1100 and 1000.  This has a BLUE label
 
Transistor Pre-amp for use with the VR-1200 signal system.  This has a  RED 
label.
 
Nuvistor Pre-amp for use with the VR-2000.  This has a GOLD  Label.
 
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.
 
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.
 
Chris Hill
WA8IGN
 
 
In a message dated 11/20/2014 10:36:24 A.M. Eastern Standard Time,  
quadlist at quadvideotapegroup.com writes:




Hello Don,
I have never been able to compare the  VR-1100 and 1200/2000 heads so 
what is the identifying difference that  you're talking about with the 
preamps?  How can it be seen  externally?

Thanks,
Roger


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