I am new to the forum. I just came across information about the (HG-70 Harmonic Generator). It is something I always thought was possible, I am just not well versed enough in electronics to experiment to that degree, as transistors and IC chips are so complicated. Also emulating tubes using transistors up to this point has not been accomplished to the degree it can be done simply enough to be available to the mass market.
Would anyone possibly have a schematic diagram of an HG-70, it seems it was short lived and never quite made it to market in any great numbers. I would greatly appreciate any help in this matter.