Vacuum tube module
||On metal frame
overall: 1 3/4 in x 8 1/2 in x 7 1/4 in
Fully populated with six tubes in six sockets. Written on brown tag is "(100 KC)-71+85 (10KC)-67+76 12-20-58 R.J.B." Note with module says that this module might be part of X1040.90 WISC.