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

[Tim Stoffel]

On Wed, 2008-08-06 at 11:04 -0400, 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?

The earlier machines (2000's for sure) that used the Intersync used a
shunt-regulated power supply that was not an example of Ampex's better
work. This required the Intersync to actually have dummy loads that
would be switched in and out of circuit to keep the supply current more
or less constant. I have one machine with this arrangement. I have never
had a problem, but dread the day when I do.

Any series regulated supply, or switcher, was a big improvement!

Tim Stoffel