[QuadList] 15 mil Headwheels ?!?!?!?!?!

[Tim Stoffel]

On Thu, 2009-02-26 at 18:32 -0500, Don Norwood wrote:
> This is a new discovery for me.  I knew that between air and ball bearings, 
> 10 and 5 mil tips, and threee different preamp modules, there were lots of 
> variations of the Ampex MK-X head.  All of them were pt# 1800705-xx with the 
> dash number differentiating the configuration.
> 
> But.......what I had not seen until looking in an Ampex catalog is that dash 
> numbers from 209 thru 239 were 15 mil heads!  Yes, that's not a typo that 
> should have been 5, it is actually 15.  What were these for?????
> 
> This only seems to apply to the MK-X heads.  I do not see 15 mil offered for 
> the MK-XI, XV or XX.
> 
> Don 

Maybe this is in the same category as the mysterious AVR-4.

Tim Stoffel