SK1A Tube Socket
for GU-74B (4CX800) Tetrode
This page shows the Russian SK1A tube socket. Below at left is the SK1A socket; at right is the socket with a GU74B (4CX800) installed.
This is a 7-pin socket made of high quality dielectric. An Annular 0.01 uF screen grid bypass capacitor is built into the socket which
may be reconfigured to remove the effect of the capacitor or provide grounded grid
operartion when required. All tube pinout electrode connections and all wiring
points for solder are silver-plated.