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ms660 · 14th Mar 2019, 2:12 pm

Bypass switching aside, the current through the solenoid is dependant on the current through the sound output valve only (V4) According to the voltages in the manual the solenoid current should be approx. 43mA.

Lawrence.

14th Mar 2019, 2:12 pm	#55
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Ferrograph 4A: Restoration advice needed Bypass switching aside, the current through the solenoid is dependant on the current through the sound output valve only (V4) According to the voltages in the manual the solenoid current should be approx. 43mA. Lawrence.