[QuadList] VMI 7811 process (Was AMPEX MARK TEN HIGH-EFFICIENCY VIDEO HEAD...)

[Ted Langdell]

Tony, 

Cool that you can pull up that information!

Can you tell us more about the 7811 process... what that involved and why that was done?

I remember you telling me about why you liked the way RCA did their head design and manufacture.  The list would probably like to hear about that.

Ted

Ted Langdell
Secretary
Skype: 	TedLangdell
e-mail:	ted at quadvideotapegroup.com



On Aug 3, 2013, at 4:28 PM, Videomagnetics wrote:

> I just checked our log book and we refurbished this head back in 1982....  Looks good as new... the 7811 process was an RCA type transformer conversion.
>  
> Tony
> ----- Original Message -----
> From: Don Norwood
> To: Quad List
> Sent: Saturday, August 03, 2013 3:31 PM
> Subject: Re: [QuadList] AMPEX MARK TEN HIGH-EFFICIENCY VIDEO HEAD IN CASE
> 
> 
> 
> 
> Hi Chris.....
>  
> You'll note that all of the parts this seller is offering are likely from a VR-1000.  The reel motor is definitely VR-1000, the capstan motor likely is (note the caps which are not used on Intersync systems), and the head is ball bearing.  Can't tell from the pics what module is installed, but most likely trim pot.  The head could also be used on a VR-1100 that hasn't been updated, but isn't useful for a 1200 or 2000.  The capstan can be used by removing the caps, but the point is it's likely quite old, and the belt could also be a problem.  Just thoughts for anyone looking at these for spares!
>  
> Don
> 


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