Date: Thu, 28 Jun 2012 15:22:16 +0200 From: Sander Reiche <sander.reiche at gmail.com> To: cctech at classiccmp.org Subject: Teletype ASR33 110 or 220V? Message-ID: <CACStewZZ+V4fNskjsSexYHTLFdagDED03vqEsoYZcTL438Gf_g at mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Hi all, Do you guys know of a failsafe way to check if a Teletype is for 110 or 220V? I've bought one which has a power connector which seems like US mains. The motor is 50Hz, but I guess that won't make a difference. Any quick way to check without completely dismantling the machine? Yes, the 50 Hz will DEFINITELY make a difference. I think the ASR33 has mechanical send as well as receive, so the baud rates will be off in both directions if you run it off the wrong line frequency. But, the motors may be 50/60 Hz, I think they changed a gear to select the mains frequency. I guess try running it on 120 V, if the motor fails to start or runs very sluggishly, then it is most likely a 240 V motor. Jon