These are original ECC83 12AX7 Philips dimple disc getter with 8 nipples, made in Heerelen plant in Holland. They come in big Philips service boxes.
This original Philips ECC83 / 12AX7 is identifyed by ribbed plates with one side hole and dimple disc getter
– I66 Δ2A1 & Δ2A2 Philips code
I6 = ECC83
Δ = Philips, Heerlen
2A1 = January 1972
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