The power transformer terminal seems to be made by Tektron due to its shape and appearance. Primary: 100V, Secondary: 5V/3A, 5-10V/2A, 6.3-10V/2A, 360-340-0-340-360V/150mA It seems that it was used to drive a 300B single amplifier. There are scratches in some places (Yosuke Kojima)
Accessories: none
Main specifications: W100 × H150 × D100 mm approx. 4.6 kg/piece (actual measurement, not including protrusions)