There is no negative side, it's just a single connection. If you go to scopeboy.com/amps then click on Ninja Corvette, then scroll down to the bottom of the page, there's a link to a PDF schematic of an amp I built using this trick. The PT had no centre tap for the heater winding, so I used the two 100 ohm hum balance resistors. Instead of connecting the midpoint of them to ground, I connected it to the cathode of the power tube. That's all there is to it.
I know the preamp part of the circuit looks crazy. I've since rebuilt it with smaller cathode resistors and a better tone stack driven by a MOSFET follower.
I know the preamp part of the circuit looks crazy. I've since rebuilt it with smaller cathode resistors and a better tone stack driven by a MOSFET follower.
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