[GreenKeys] 35-KSR - 50Hz gears

[epvgk at limpoc.com]

On Sun, Dec 07, 2014 at 10:10:02AM -0500, Ralph Mowery wrote:
> I am thinking all the 100 lb supply in the M-19 did was supply about
> 100 volts for the punch ,and maybe a loop, but not sure about the
> loop.
> 
> I have the  M-19 with the big supply, but it was modified long
> before I got it.   The only time I turn the supply on is to punch
> the tape.
> All the loop current comes from the ST-6.

It provides regulated DC for the punch and auxiliary loops, and
optionally also provides step-up/down from varying line voltages
by means of different winding taps, and has iirc a tap for 25 Hz
power as well, and enough iron in the core to presumably not 
saturate when running at 25Hz.  I have one that actually works,
but I don't use it - don't need the step up/down and have 
substituted a small modern switching supply as the punch power
supply. It's fun to start it up occasionally when you want to
give a nice light show, though: 
https://www.youtube.com/watch?v=fxy2Ifo8Xx0

eric

> 
> ----- Original Message ----- From: "Jim Haynes"
> <jhhaynes at earthlink.net>
> To: <epvgk at limpoc.com>
> Cc: "Green Keys" <greenkeys at mailman.qth.net>; "tony.podrasky"
> <tony.podrasky at gmail.com>
> Sent: Sunday, December 07, 2014 8:46 AM
> Subject: Re: [GreenKeys] 35-KSR - 50Hz gears
> 
> 
> >On Sat, 6 Dec 2014, epvgk at limpoc.com wrote:
> >
> >>There's always the 130 pound block of iron that is the old style M19
> >>power supply unit. hehehe.
> >>
> >Which doesn't do anything for a Model 35.  And most of those M19 power
> >supplies use constant voltage transformers which are quite frequency
> >sensitive.  In the military, where frequency accuracy cannot be assured,
> >the M19 used thyratron rectifiers or magnetic amplifier regulation.
> >
> 
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