excellent pair ECC88, Philips, 6DJ8
plant: Heerlen, Holland, 1970
both tubes coded: ∆0B4, triangle sign,
A-frame dimple disc getter, used, but testing 100 %
see pics for test results: 16 / 15 and 15 / 15 mA
tested on AVO MKII tester, at Va = 90 v, Vg= -1,2 V,
and Ia = 15 mA means new
ecc88 1970 pair PP