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Old 28th May 2020, 9:06 pm   #10
Dave Moll
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Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
Default Re: GPO Jack unit 1B and regulator 6B

I think that regulator is specific to the Jack 1B. I have a 1B with a similar one. The 700 series 'phones use a regulator of a completely different design.
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