Vacuum Tube - 5693, Pentode, Sharp Cut-Off
New-Old-Stock (NOS) tube.
Also known by US military identifier VT-116B.
Sharp cutoff pentode intended for critical industrial applications where 10,000 hour life, extreme uniformity, rigid construction, and exceptional stability are paramount. Within its ratings, the 5693 may be used to replace its receiving-tube counterpart, type 6SJ7.