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

[videomagnetics, Inc.]

The 15 mil heads were actually notched to 10mil at the gap area. This
led to better like expectancy of the drum. The warranty on the 10 mil
was 200 hrs and on the 15mil was 500 hours. Only problem was that as the
head wore the rf envelope became rounded and produced error at the
transitions that sometime the vtr's amtec would not able to totally
correct this caused  banding and poor recordings for interchangeability.


Tony

-----Original Message-----
From: quadlist-bounces at quadvideotapegroup.com
[mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of Don
Norwood
Sent: Thursday, February 26, 2009 4:32 PM
To: Quad List
Subject: [QuadList] 15 mil Headwheels ?!?!?!?!?!

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 


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