Re: Where can I find...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steve Stuart by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sstuart-at-glasscity-dot-net>

Not that long ago there were myriad teletype machines to be
found. Fully mechanical, they depend on synchronous motor.
They're 1800 RPM at 1/40th HP. I still see these beasts at
hamfests for pennies as the seller is not usually interested in
carting them back home with them. You will find a motor in each
print or paper tape unit.

Steve w8an-at-qsl-dot-net

Tesla list wrote:
> 
> Original poster: "Matt Woody Meyer by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <meyerml-at-stolaf.edu>
> 
> Does anybody know where I might be able to find a reliable but still
> inexpensive motor for a SRSG?  1800rpm should be fine.
> 
> Also, does anybody know a good place to get capacitor oil?
> 
> Another couple questions too...
> I've noticed that many of the larger coils use a resistive ballast... is
> this something that you only need for a distribution transformer, or do some
> use it with NST's also?  I'm running 2 12kV/30ma and one 15kV/60ma
> transformer, all in parallel.
> 
> For the protection circuit- can I bridge one circuit across all three
> transformers, or should each transformer have it's own protection?
> 
> Lastly, I am considering "borrowing" one of our department's variacs instead
> of buying one of my own.  I know that while tuning the coil, it's not the
> best idea to run it at 100%, however, after the coil is in tune, is it still
> better to have a variac to ramp up the HV, or is it safe just to "throw the
> switch" once the coil is tuned?
> 
> I've heard of using a "bleeder resistor" to discharge the capacitor after
> coil use.  I've never heard of this, what exactly is it?  For a simpler
> solution, it also works to directly bridge the capacitor terminals also,
> right?
> 
> and lastly...
> 
> Just out of curiosity, how does the TC designer program go about calculating
> arc length?  9.7 feet seems a bit much from the coil I'm working on :)
> 
> This is all I can think of at the moment.  Thanks again for all your help,
> ><>Matt
> 
> ><>  ><>  ><>  ><>  ><>  ><>  ><>  ><>  ><>  ><>  ><>  ><>  ><>  ><>
> Matt "Woody" Meyer         Ellingson 120       507-646-2883 (CUTE)
> 
> St. Olaf College Physics Major
> St. Olaf Admissions Tour Co-Coordinator
> 2001-2002 Ellingson Hall Residence Life Junior Counselor