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View Full Version : Creed 7E Teleprinter Restoration, pinouts needed.



TJ_Mossman
August 3rd, 2014, 04:04 AM
Hi All,

I've recently acquired a Creed Model 7E Teleprinter in semi-working condition. So far it powers on and the transmitter appears to work but I'm not sure how exactly these creed units were configured. Do they have 'local echo' or would I need to make a loopback cable to see anything print? Either way there's no output yet and the connectors are cut.
I'll post some pictures later.

Any tips and info would be greatly appreciated.

g4ugm
August 4th, 2014, 12:21 AM
Just send it to me.... and I might get it back to you in 50 or 100 years....

Seriously Creed 7's and 54's do not have local echo, (Creed 75's do) you need 80-100Volt @ 60ma to drive the Magnet. There is a circuit on Page-4 of this manual :-

http://www.baudot.net/creed/docs-alan-hobbs/rtty-the-easy-way.pdf

If you want to drive it from a computer you will need a couple of MJE340 transistors and some 3k3 3Watt resistors as per the ST5 diagram later in the book.

There is more info here:-

http://www.samhallas.co.uk/repository/telegraphy.htm

and you might also want to join the Greenkeys mailing list, and get a copy of the RSGB teleprinter handbook. There are some on Abe's Books for around 10....

TJ_Mossman
August 4th, 2014, 07:59 AM
Cheers Dave!

Yes, I am hoping to drive it from a computer. Good to see there's no local echo, I reckon I can hide a Raspberry Pi in there and clamp a 5" composite monitor on it somewhere to recreate the terminals from Terry Gilliam's 'Brazil'. I'm not going to make any permanent mods though.

woodchips
August 16th, 2014, 01:33 AM
The baudot.net link comes back with a not found error, anyone know why?

Whilst on the subject of Telex and Creed TTYs, does anyone know where the operator and service manuals for the Trend teleprinter testers can be found please? These are complex boxes full of TTL used to test various teleprinters, not just Telex.

As a challenge, if you want to get the Creed 7 to work with a computer then make a non-computer based interface. I designed one that used a 1402 UART, a model railway point motor to drive the figures/letters selection, and moving all the type in the circular cage to reflect on ASCII rather rather than Baudot. Seem to have lost the circuit in the last 40 years but trying to recreate it.

g4ugm
August 16th, 2014, 02:22 AM
looks like the baudot.net site has a problem. Get error trying to access the root..

I have some TREND paper tape reader punchs and would like the manuals for them, if any can help...

1944GPW
August 16th, 2014, 04:03 AM
Archive.org has it through https://web.archive.org/web/*/http://www.baudot.net/creed/*
Quite a detailed article there.
I have a Creed as well ...unfortunately not a teleprinter but an ex-Royal Australian Navy Creed 9W Morse perforator in extremely poor condition. Possible restoration candidate one day (er, decade).