What to look for in a Model 33 Teletype - a newb's buyer's guide?

Robert Jarratt robert.jarratt at ntlworld.com
Fri Nov 21 01:41:30 CST 2014

I suggest you subscribe to the Greenkeys list. I don't know too much but a couple of things to know are:

1. The rubber hammer perishes. Do *not* operate the machine without replacing it or you will cause irreversible damage to the typewheel. There are two ways to do this. One is to use some PVC tubing, the other is to ask on the Greenkeys list as someone has now manufactured some completely new rubber hammers.
2. Make sure you grease and lubricate it before turning it on. Turn it over by hand first. The manuals are available to tell you where to lubricate etc. I can supply copies if necessary.
3. You will almost certainly need a current loop converter. I was lucky to find one on eBay which works like a charm, I think there are others. The alternative is to make your own. There are some designs knocking around that don't seem too complicated.

There are probably lots of other things, checking for excessive wear for example.

I love my Model 33, hearing that sound again is wonderful, it is definitely something worth getting and looking after!



> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of drlegendre .
> Sent: 21 November 2014 06:53
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: What to look for in a Model 33 Teletype - a newb's buyer's guide?
> I've gone off the Deep End and now I just have to re-have a Teletype model 33..
> I feel awful about what became of the junker I bought for $15 when I was a 13
> year-old and wish I still had it today, so I could fix it and put it to use.
> So what should a mentally-challenged guy like myself be looking for, in a Model
> 33 - preferably an ASR model with the paper tape reader?
> What does and doesn't go bad? Are there any serious game-changing, show-
> stopping or buzz-killing issues that effectively render one of these units as a
> parts donor? What differences exist between the various ASR-model units, as
> they progress through the years? What does one look for
> - and more importantly, what to avoid?
> And one more - how do you differentiate a 20mA current-loop model from a
> 'standard' RS-232 model? Can you tell from the rear panel, or do you need to
> go under the hood?

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