Audio Note Mono Block 300b/2A3 Instruction Manual page 44

With these wirings complete we are now going to install the front faceplate and work "inside the chassis" Well done so
far!!!
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Install the 1K5 pair between pin 4 of the valve base and the
GND clip.
Also install the 220uf 100v cap across the resistor from pin
4 to the GND base – ensure that the Negative side of the
electrolytic capacitor (220uf 100v) is on the GND tag side.
Also add the prepared Black wire to the GND tag.
Position the front faceplate into the chassis with the 8-pin
valve base on the side with the small RCA hole.
Then screw into position with the M3 countersunk screws.
Page 44