The Kantronics UTU would be a good choice to interface with a Model 33. The output is 110 0r 300 baud ASCII. I use one to copy ITTY and it works great with the Raspberry Pi Zero W running Minicom and a RS232 adapter at 300 baud. I’m thinking about looking for a Model 43 to use with the UTU if I can find one with a roll paper feed here in the NY area. Take care, Vendel/ K2DSI.