Online store for vintage audio & Tube audio products
Mickey De Acoustics

Mullard fat base GZ34 NOS from the Blackburn plant. Tube has code F31 B9H . Tube was manufactured in August 1959. Thesetubes are very sort after.

Tube test with new readings.

56/56 on a TV-7 where 40 is the minimum reading.

Price is US$280 per tube.