Where is ak 37 radio power supply In Riders

[Videotechie]

Thanks for info space control.. great info. I believe the 2nd audio bias resistor shorted 3. Possible bad tube or someone accidentally shorted spkr terminal.
I'm gonna do something different when restored. Might replace bottom plates for cabinet and power supply with geometric metal sheet. Some scopes and other equipment used this to give units ventilation to cool. Mass produced at home depot should lighten this boat anchor a bit.
These unis are made extremely well and shouldn't be discounted. Copper tuning belts with brass wheels well made as AKs are..