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Here is TU-8233 PCB board with optional Del Ritmo oil Cap (0.1 X 4).The most appealing point of this amplifier is that 300B, another popular tube among audiophiles, can also be used. Generally, although 2A3 and 300B are similar tubes in various aspects, they cannot be replaced with each other due to the difference in voltage. TU-8233 solved this problem by a very unique function; automatically distinguishes 2A3 from 300B by detecting the difference of filament voltages from the tubes and switch A voltage and B voltage ( A voltage: filament voltage, B voltage: B+ high voltage).
Edits: 01/05/13 01/05/13 01/05/13 01/12/13Follow Ups: