(!!!!!) (Best Single 1963) GZ34 Mullard Hewlett Packard UK low hours/like new (60/40 and 60/40) 1% section balance
(!!!!!) (Recommended Single) GZ34 EICO Mullard UK low hours/like new 1962-1967 era (58/40 and 59/40)
(!!!!) (Recommended Single 1967) GZ34 Mullard NOS rebranded Siemens NOS 1967 (58/40 and 58/40)
(!!) (Best Single) GZ34 Mullard NOS rebranded Sylvania NOS 1971 (60/40 and 60/40)
(!!) (BEST VALUE) GZ34 Mullard rebranded Sylvania used/like new 1969 (58/40 and 59/40)
(!!) (BEST VALUE) GZ34 Mullard rebranded Sylvania used/like new 1969 (58/40 and 60/40)
(!!) (Best Value) GZ34=5AR4 Philips Mullard NOS 1979 (59/40 and 59/40)
