Philips EL34 6CA7 XF2 welded plate OO getter , matched quad, Blackburn factory

XF2 double ring OO getter, welded plates. Made inMullard Blackburn factory. Matched quad. All codes start with XF2 B7 (year 1967). Ultra wanted tubes for HiFi and guitar amplifiers. Very durable, strong and the best sounding EL34 tubes!

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