New in original boxes! "Elektronska industrija Nis Yugoslavia" on box indicate older EI production, comparing to "Serbia" printed on side of boxes.
These tubes from late 70s, made in Nis, Serbia under Philips technology (A-frame dimpled disc getter) and with Philips materials. Can be used in ECC88 / E88CC / 6DJ8 / 6922 aplications.
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