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Gridiron · 19th Dec 2019, 11:24 am

The phase inversion for the Y amp comes from the common cathode resistor for the first pair of EF36's, the input signal going to the control grid of the top EF36, the lower grid being connected to earth.
Mike.

19th Dec 2019, 11:24 am	#21
Gridiron Heptode Join Date: Apr 2010 Location: West Midlands, UK. Posts: 662	Re: Vintage Mullard Oscilloscope The phase inversion for the Y amp comes from the common cathode resistor for the first pair of EF36's, the input signal going to the control grid of the top EF36, the lower grid being connected to earth. Mike.