Re: Starting a Teletype sync motor question

• To: tesla-at-pupman-dot-com
• Subject: Re: Starting a Teletype sync motor question
• From: Gary Lau 04-Jun-1999 0622 <lau-at-hdecad.ENET.dec-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Fri, 04 Jun 1999 21:53:20 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

>>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

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