RARE Mullard 12ax7/ECC83 LONG plates tube O-getter. Made in UK, Blackburn factory. Tests very strong at NEW level and tightly balanced.Test Results (MaxiPreamp 2, min: 0.8). Tube 1: 1.6/1.5. Welcome to Tube Maze Store. Here you will find a wide selection of NOS and reissue tubes. All tubes are also tested for noise and microphonics.