|  Pre amp-1 |  Pre amp-2 |  12BH7APP |  6GA4PP |  42S |  6SN7PP |  Player |  Speaker,etc |  Books,Circuit | 

This pre amp had gotten in 1982 from senior company. The wooden board is used both sides.

1.Tube are using 12AX7A and 12AU7A.

2.Rear side.

3.Wiring.