ecca wrote:I found a schematic of the valve preamp that I used with the eTap2hw online.
This is obviously 1/2 of it and there's an error inasmuch as the heater supply is shown as AC when in fact it's rectified.
valve preamp.jpg
Try 0.1uF caps as the couplers that should improve the treble or even go to 0.01uF.
Usual Anode load resistor in meazzis is 100k Grid leak caps could go to 1 meg, 10k is a bit low for
a guitar input bearing in mind that single coil pickups are usually around 250k impedance and humbuckers
500k.
the 10k and 3.3 uF are a feedback circuit to adjust the gain of the amp..
Amanda