Philips
Matched Pair ECC83 Philips 12AX7 1957 mC5 Delta7L D-Foil Getter 19mm Anodes NOS
Matched Pair ECC83 Philips 12AX7 1957 mC5 Delta7L D-Foil Getter 19mm Anodes NOS
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One Matched Pair (2 tubes) ECC83 Philips 12AX7
Cross foil D getter, mC5 codes, made in Heerlen tube plant in 1957. The same codes mC5 Delta7L.
Very rare version, the longest anodes 19mm, very very good sounding ECC83, probably one of the best ever.
Tested also for hum and microphonics in RIAA preamp.
They are tested with 250V on anodes and -1.5V on grids, 100% is 2.15 mA, they test (2.4/2.1) (2.4/2.5) mA
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