Model:
403A=5591 (6AK5)
Brand:
Western Electric
Classification:
Pentode (special 6AK5)
Model:
404A=5847
Brand:
Western Electric
Classification:
Pentode
Model:
408A=6028
Brand:
Sylvania (GB)
Classification:
Pentode
Model:
717A
Brand:
Raytheon
Classification:
Pentode