Tube Amplifiers Home -» Schematics -» Magnatone Schematics -» Magnatone 213 :
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Jim- you are correct. the ground was left off.
There appears to be a mistake in the schematic. I don't see where the cathodes are grounded on the 12AU7 tube. It looks likes a ground should be at the junction of the 82k and 43k resistors.
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