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Thank you Sean! Yes, I was really happy when I had that idea and when I found the software for "mirror converting" the photo. That really made it possible to RE the design to a standard electronics drawing on paper(if that is the English name). It is so time consuming and difficult to look at the board from both sides and then try to draw the connections and the components.
good design, I have the same need for a power load. I har planned to design something like this with a PowerMOS, now I don't need to. Thank you. Good choice of op-amp. Not all can handle inputs down to the negative (ground) rail. I liked your text. It is always interesting to read about design discussions etc. Ambitious - to make a PCB board!
The idea was nice, but the capacitor solution would require additional controls for bass and mid, and the tone control with only one pot that is used now, can not be redesigned for a capacitor solution. So the capacitor goes to the museum. But thanks for the interest anyhow!
Thank you Jfieldcap!But the truth is that the tuning capacitor had to be replaced by a 50k pot.The large surface area of the cap was a too good antenna for all hum and noise present int the amplifier. Yes the looks is almost as in 1953, only one tele input and one gain control.