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Old 7th Aug 2019, 9:10 am   #7
Trigon.'s Avatar
Join Date: Jun 2018
Location: Buckinghamshire, UK.
Posts: 216
Default Re: EMI Valve Scope Type B Amplifier - Free to a good home

I believe it's a plug-in from an EMI WM8 'measuring oscilloscope'.

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I can't find a single photo of a WM8 on the web, but here's an earlier WM4:-

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Note the panel meter. This enables more accurate measurements than could be achieved at the time using the screen graticule.

As the amplifier gain is switched, the range of the meter is effectively changed also - hence the switch markings.

The later WM16 replaces the meter with a calibrated shift dial:-

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