excellent pair ECC88, Philips Amperex, 6DJ8, Bugle Boys
plant: Heerlen, in the very south of Holland, 1965
both tubes coded: GAA ∆5E2,, triangle sign
normal ring getter, used, but testing NOS
see pics for test results: 19 / 17 and 16,5 / 15
tested on AVO MKII tester , at Va =90 v, Vg= -1,2 V,
and Ia = 15 mA means new
ecc88 1965 pair DD