UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - GPO Detector No3 Does anyone have any information.

Oldcodger · 15th Oct 2019, 9:45 pm

I'd query the No4 dates. My TO mentor in my home area had one in his tool kit , from memory ain a black plasticy case. He took great delight in teaching me about it's use, especially for finding HR faults and it's benefits over the 9083.
I remember the circuit of a Det4 being discussed on either my "A " or "B" courses in 1966 and 1967 to explain how meters worked and how to calculate series and shunt resistance with the emphasis on high resistance input meters.
And again as in the last post where are the 400/500/600 series phones.
Even this shows a gap in the numbering
https://www.britishtelephones.com/telelist.htm

Possibly like the gaps in numbering the Det's ,new versions of the phones could have designed and trialled but not found suitable.

15th Oct 2019, 9:45 pm	#3
Oldcodger Nonode Join Date: Oct 2014 Location: West Midlands, UK. Posts: 2,181	Re: GPO Detector No3 Does anyone have any information. I'd query the No4 dates. My TO mentor in my home area had one in his tool kit , from memory ain a black plasticy case. He took great delight in teaching me about it's use, especially for finding HR faults and it's benefits over the 9083. I remember the circuit of a Det4 being discussed on either my "A " or "B" courses in 1966 and 1967 to explain how meters worked and how to calculate series and shunt resistance with the emphasis on high resistance input meters. And again as in the last post where are the 400/500/600 series phones. Even this shows a gap in the numbering https://www.britishtelephones.com/telelist.htm Possibly like the gaps in numbering the Det's ,new versions of the phones could have designed and trialled but not found suitable.