Pair Of XF1-Big Brown Base Mullard 6CA7/EL34 Vacuum Tubes-Used (Item: RDW-509)

Very rare and extremely sought after pair of EICO By Mullard 6CA7/EL34 power pentode vacuum tubes-used-fully tested. These are the famous XF1-"Big Brown Base" version, dual getter rings, welded plates made in the Blackburn, Great Britain plant! One tube tests 9040 uMhos (baseline 5650 uMhos) and 44 ma. and the other 8588 uMhos and 40 ma. Tested on Hickok AN/USM-118B tube tester. Will come in white tube boxes.