(!!!!) (Best 5Z4G Pair) 5Z4G Tungsram UK black plates NOS 1950's (56/40 and 56/40) (G9 Audio preamp) (Best sub for Russian 5Ц4С / 5U4C Russian)
(!!!!) (Best 5Z4G Single) 5Z4G Tungsram UK black plates NOS 1950's (56/40 and 56/40) (G9 Audio preamp) (Best sub for Russian 5Ц4С / 5U4C Russian)
(!!!!) (Best Overall Single) 5Z4G Tungsram UK black plates NOS 1950's (56/40 and 56/40) (G9 Audio preamp) (Best sub for Russian 5Ц4С / 5U4C Russian)
(!!!!) (Recommended Single) 5Z4G Brimar UK black plates NOS 1950's (57/40 and 58/40) (recommended for Audio Note)
(!!) 5Z4G Brimar England low hours/tests like new hairline crack in base (54/40 and 55/40)
