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

[Don Norwood]

Tony:

Thanks so much for answering this!  I did recall some longer life heads, but 
I didn't associate them with the 15 mil width.

Don

----- Original Message ----- 
From: "videomagnetics, Inc." <vmi at csprings.com>
To: "'Quad List'" <quadlist at quadvideotapegroup.com>
Sent: Thursday, February 26, 2009 7:23 PM
Subject: Re: [QuadList] 15 mil Headwheels ?!?!?!?!?!


> 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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