No Bass knob! That's it! Ebay "untested" not "spare repair"
Found an Su840 knob replacement for balance, close enough.
The power out is 53Vpp = 26.5Vp = 18.74V RMS = 351 / 8 ohms = 44W per channel into 8 ohms.
This is with a massive 7Vp tuner input from the Carlson 1kHz Oscillator though, so hardly near the volume control peak. Perfect symmetry.
