Details：

ARC tube voltage regulator circuit.

6Z4 rectification, 12AT7 for voltage comparison, 12B4A for adjustment

The voltage is adjustable from 150V to 400V

With a set of filament voltage regulator

Can output 6.3V or 12.6V voltage

Board size: length 222mm * width 128mm

Tube model： 12at7 x 1；12b4a x1 ； 6z4 x1

Package List:

LSDY Power Supply Board ×1

Not included tubes ！

Transformer ：

https://www.ebay.com/itm/353177199259

pls choose R80-31