[GreenKeys] Model 15 Governed motor, tuning fork.

[Mike Douglas]

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 <peter at lencom.com.au> 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
> 
> 
>  
> 
> 
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