[QuadList] Variacs and awakening gear from long naps (was Gotmy VR 1200's)

[C. Park Seward]

Yes, Don has a good point. The modules like Amtec, Colortec and even  
the Vel Comp were stand alone units. Interesting the way they  
interacted. The vel comp, for example, didn't pass video but instead  
told the Amtec/Colortec what error was occuring and they fixed the  
error.

Best,
Park

C. Park Seward 818-535-2747 cell
949-679-1870 hm
Visit us at: www.videopark.com
Sent from my iPhone

On Nov 27, 2009, at 1:11 PM, "Don Norwood" <dwnorwood at embarqmail.com>  
wrote:

> One of the major design differences between RCA and Ampex quads of  
> the VR1200/2000 and TR-70 era is the approach they take with power  
> supplies. RCA has several large supplies which run everything.   
> Ampex has smaller, individual supplies for most of the various  
> systems in the machine.  Which approach is better is a subject for  
> some discussion, but when it comes to bringing up an old machine on  
> a Variac, almost any size can be used with the Ampex machines since  
> you can easily control what sections are powered.  For that matter,  
> since all the subsystems (Amtec/Colortec/Velcomp/Audio/etc) are  
> separate, you can plug them into variacs individually, or when you  
> have them out of the machine for cleaning.
>
> One caution.....DO NOT power on the signal system and servo supplies  
> without load.  They are shunt regulators and will dissipate all of  
> the power in an unpleasant manner...........
>
> Don
>
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