GI-7BT / GI7BT URSS POWER COAXIAL TRIODE TUBE OTK/RHOMBUS. Type Pulse tetrode. Military quality check passed (rhombus ). Decoding the triode marking GI – generator pulse;. GI-7B GI – letters defining the type of lamp.
GI-7BT / GI7BT URSS POWER COAXIAL TRIODE TUBE OTK/RHOMBUS. Type Pulse tetrode. Military quality check passed (rhombus ). Decoding the triode marking GI – generator pulse;. GI-7B GI – letters defining the type of lamp.