• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Eico ST70 OPT / Schematic Question

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#21
Relevant section of ARC schematic for comparison.
Here, 4 ohm GND served an actual useful purpose.
 

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