Re: Starting a Teletype sync motor question

• To: tesla-at-pupman-dot-com
• Subject: Re: Starting a Teletype sync motor question
• From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 06 Jun 1999 04:19:26 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: Gary Lau  04-Jun-1999 0622 <lau-at-hdecad.ENET.dec-dot-com>
> 
> >>My teletype motor uses a cap marked "88-108 MFD, 125VAC 60 cycles", a
> >>curious rating.  It measures 137 uF on my c-meter.  It seems to be very
> >>lightweight for it's capacitance compared with other motor starting caps
> >>I've seen, perhaps because it's only rated for very low duty cycles.
> >>Maybe the cap you're using is too small?
> >>
> >>Regards, Gary Lau
> 
> >        That's most interesting.  Never heard of a TTY sync motor using
> >an electrolytic starting capacitor, which is what you are referring to!
> >What kind of TTY?
> 
> It was (I think) an old ASR-33 teletype machine, the kind with the
> built-in paper tape punch.  Found it in the "Take me home free" section
> of a hamfest.
> 
> The cap is further marked:
> Industrial Condenser Corporation
> Royalistic Capacitor
> Long Life
> 88-108 MFD
> 125VAC 60 cycles
> Motor Starting Capacitor
> 
> It does appear to be a dual section electrolytic, with just the (+)
> terminals used, essentially in series, although there are no markings to
> confirm this.
> 
> Regards, Gary Lau
> Waltham, MA USA

	Will have to look at my 28ASR and make absolutely sure the motor in it
doesn't use a starting capacitor.  Almost sure it doesn't.

	If anyone in the LA area is interested in old TTY machines, visit my
"for free, pickup only" junk bin.  Hate to throw them out in the trash.

Ed

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