Audio Note Mono Block 300b/2A3 Instruction Manual page 37

Install the plastic insert onto the M3 x 8, pan head screw and then position into the hole for the regulator – Tighten the
screw – now its important that the screw if firmly tight but do not squeeze the daylights out of it or you will break the plastic
insert – make it nice and firm in order that the regulator is flush to the heat sink so that it can dissipate heat – If the
regulator gets too hot because it is not able to dissipate heat then it will shut off and the tube will loose its filament voltage.
Congratulations you have completed the Filament Board section!
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