Wow, thank you this, it's excellent work, saved me drawing it up and running the simulation, what was the software that you used, was it ElectricVLab by any chance as I believe that program also has problems drawing and showing potentiometers.Felt like playing around a bit. The given circuit actually responds fairly well to Si substitution. Needed to raise RV4 outside its adjustment range to 15K. RV3 adjusts at 8K/42K.
At an output level of 1 W, distortion at 1KHz is <1%. The circuit does have a significant peak around 80 Hz, and the tone control network kills the high frequency response, but that might be to compensate for the small built in speaker.
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I attach in case your interested the complete service manual for the radio.
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