[GreenKeys] Refurbishing a KSR-33

[John Nagle]

> From: Christian Gauger-Cosgrove <captainkirk359 at gmail.com>
> Subject: [GreenKeys] Refurbishing a KSR-33

> Fourthly - and this issue is not all that pressing until everything
> else has been fixed - but I have no idea what the connection for
> the input/output of the teletype is. I say this because the connector
> isn't what I ususally assumed was a current loop connection. But
> the connector - which is a male DB-25 connector - doesn't seem to
> have enough of it's pins connected to the cable to the teletype to
> make sense as an RS-232C serial connection. (However, the giant
> brick of a box made by "UTEC" looks like it could be a current loop-
> to-RS232 converter, so that may be the solution to that.)

     KSR-33 machines with DB-25 connectors were all over the place
on wiring.  I've even seen one where 120VAC was present at the
DB-25 connector to power a modem.

> Two final queries; firstly, what kind of ink ribbon does the Model 33
> teletype use, and where can one find a replacement ribbon?

    Like almost all Teletypes since the 1920s, it runs on Underwood
typewriter ribbons.  NuKote B76, available from Amazon.com.

> Secondly,
> Is it possible to use 8.5" roll paper with an inner core diameter of 2"
> instead of 1" when replacing the paper roll?

    It would probably drag against the bottom of the paper spool rest
when full. But get some plastic electrical conduit of the right size to
slip over the paper roll rod and fill it out.

					John Nagle