Re: Solid state preamp for EL84
At the moment that looks a possibility, connect the volume control to the grid again etc so it's as it was before with your preamp connected.
Measure the grid voltage and the cathode voltage both with respect to chassis.
If the valve is drawing grid current it could be a defective valve or something external.
If the grid draws grid current the grids input impedance plummets, that low impedance in conjunction with the relatively high source impedance will cause the positive peaks of the input waveform to clip.
Lawrence
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