[QuadList] First Tech Publication posted towebsite:Ampex 1021Intersync...

[Pat Shevlin]

Not sure Don but I do recall the power rails were a lot cleaner.  If I
recall they also improved the ground plane and RF shielding.

Pat

-----Original Message-----
From: quadlist-bounces at quadvideotapegroup.com
[mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of Don Norwood
Sent: Wednesday, August 06, 2008 10:00 PM
To: Quad List
Subject: Re: [QuadList] First Tech Publication posted towebsite:Ampex
1021Intersync...

Hello Guy:

I've been digging thru files this evening trying to find some additional 
info for Park, and I may have found an answer to my question.  The Merlin 
sheet on that power supply mod says "This is a precision regulated power 
supply of modern design which will usefully enhance the overall stability 
and the signal to noise performance of the VTR".   I assume that "stability"

would refer to the servo but "signal to noise" leads me to think that the 
servo might put some trash on the power supply buss that would get into the 
signal system.  Maybe???  I still have to say that I don't notice any servo 
improvement!

Don

----- Original Message ----- 
From: "WVGO" <WVGOfm at aol.com>
To: "Quad List" <quadlist at quadvideotapegroup.com>
Sent: Wednesday, August 06, 2008 9:38 PM
Subject: Re: [QuadList] First Tech Publication posted to website:Ampex 
1021Intersync...


> Interesting question, Don.
> It always seemed to me back then that the Intersync drift was more a
> function of ambient temperature than the power supply voltage changing.
> I worked at a PBS station way back then that had 3 1200s and a 2000,
> which, probably unlike most commercial operations, were not powered up
> 24/7.  You could forget doing anything with the machine for at least an
> hour after powerup....otherwise, you'd be tweaking discriminators almost
> continuously instead of just a couple of times  per shift.
> Guy
>
>
> Don Norwood wrote:
>> Here's a question and a "special offer"..........
>>
>> David mentions Merlin.  They offered as one of their upgrades, a
>> separate power supply for the Intersync.  The mod consists of an OEM
>> +/-12 volt supply from HP which is mounted in the rear of the machine
>> and removes the servo system from the machine's power supply.  I have
>> a 1200 with this mod, and it certainly works OK, but I can't tell that
>> there's really any difference in stability of the Intersync.  Does
>> anyone know what specific problem this upgrade was supposed to address?
>>
>
>
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