QUEEN ELIZABETH 11 SILVER JUBILEE TRIMPHONE (DELTAPHONE), 1977

Classic telephone made for the Silver Jubilee of Queen Elizabeth 2 called a Trimphone (STC Deltaphone)

Donated to the Nortel archive by Cyril Miller in 2006

Nortel Collection

Your comments:

• My 1st job as a young engineer at STC was fault finding QS10 (quickstep 10) push-button units from the production line, on their way into these phones. I still know that the sum of 1 to 10 is 55 - The 1st test was to press every button and watch the counter run up to 55, if it didn't reach the total one could then start to fault find keypad shorts etc.
  In it's day a very clever bit of circuit design, a circuit powered from the 'phone line but able to keep working in the pulsed gaps of the loop disconnect signalling that the dialler created - witchcraft
  .......... James Bird, St Albans, 23rd of May 2018
  
  
• I personally own one of these devices and only know of one other. I do not believe these were very common and would be interested in any information on how many were actually made
  .......... Andy, Kent. UK, 11th of October 2012
  
  

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