ECC83 12AX7 Rare Mullard CV4004 M8137 boxed plate 6057 with Square getter

Description

The king of all ECC83!

Audiomagical shows this stunning lot of Mulllard M8137 CV4004 6057 on glass

Limited edition valve made for a few span of time

Excellent sound

They have all been tested 100%

Each valve has ribbed plate with two U shaped rods supporting an early type of patented square getter

Plate is ribbed and mica is  well preserved!