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ms660 · 20th May 2016, 9:12 am

It might be worth isolating the grid connection from the preamp then 'scope the preamps output at the top of the volume control with the volume control turned to max.

To do this disconnect the connection from the volume control to the grid and connect a 470k to 1meg resistor (or nearish value) from the grid to chassis.

Lawrence.

20th May 2016, 9:12 am	#156
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Solid state preamp for EL84 It might be worth isolating the grid connection from the preamp then 'scope the preamps output at the top of the volume control with the volume control turned to max. To do this disconnect the connection from the volume control to the grid and connect a 470k to 1meg resistor (or nearish value) from the grid to chassis. Lawrence.