[R-390] Variacs & original spec...

[blw]

I have a nice one that Roy Morgan sold to me. It is a 240v unit that is fed
by a  transformer stepping down to 120v. No problems this way and I already
had the xformer here gathering dust.  I mounted everything on a heavy,
treated 2x6 piece to sit beside the rack. This feeds a power strip with a
R-390A, Heath HD-11, Bogan amp, and an AC voltmeter that is on the rack.
Anyway, this is all pretty much invisible when I turn on the power as
everything switches on. I keep the variac set to around 113-115vac all the
time.  The variac is nice to have installed as I can run anything that is on
the work bench over to the variac if I need to slowly bring up the voltage.


Barry non-Hauser


> Hi all!
> 
> The whole variac concern is very valid to me, on account of the age of
> these machines...
> 
> But interesting to note that in the R390A's spec, listed on page 1-6 of Rev
> 8 of the 21st Century R390A/URR Technical Reference:
> 
> :---> 115 or 230vac  +/- 10%...
> 
> Which comes out to 126.5v on the high end.  My mains are pretty darned
> stable here... between 119 and 122, less a tad'a sag when the
> air-conditioner cycles on...
> 
> DK  :-)