Sounds like you may have the same military unit I have. Most likely you'll want the 87.6 vps fork described on pdf pages 44-46 (original pages 38-40) in this manual: https://deramp.com/downloads/teletype/Model%2015/TG-7-x%20Technical%20Manual%20(hi-res).pdf.

I purchased the tuning fork off eBay. Looks like there are some available on there now.

Mike D


On Sep 28, 2025, at 8:55 PM, Peter Leonard <[email protected]> wrote:


Hi,
Our mains in Australia are 240V 50Hz. Most machines here came from our Postal / Telephone provider which purchased large numbers of Model 15 as military surplice after WW2. The fitted motors are 115V AC governed type. (transformer required). 
 Is anyone able to advise the correct tuning fork frequency for 50Hz.

Thanks 73 VK5XP

Kind regards,

Pete


 


______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]

Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]