Single sale rectifier tube 5AR4 compatible ball saw plate (4 notch type) structure and date code determined to be made by Mullard Code: f32 B7B1 measured value 54 (rejection value 40) There is a lot of printing loss and black discoloration near the base of the tube*Measured values are determined based on gM values measured by the testing machine TV-7 (Kojima Yosuke)
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