Vacuum Tube - 6SB7-Y, Pentagrid Converter
New-Old-Stock (NOS) tube.
The 6SB7Y is a pentagrid metal tube designed for use as a combined mixer and oscillator in superheterodyne circuits. Both functions are accomplished in the same electron stream. Because of its high oscillator transconductance and high conversion transconductance, the tube is especially useful in FM receiver service below 120 megacycles.