2x TESLA ECC803S (CV4004 7025 ~5751), ~1960 Prototype Series, 100%/Matched, 124+129.where a new/unused tube should have S/gm = ~1.60 mA/V, good value for transconductance starts at 1.2 mA/V. Selected from a larger lot of NOS tubes.
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2x TESLA ECC803S (CV4004 7025 ~5751), Prototype Series, 100%+/Matched, 122+128.where a new/unused tube should have S/gm = ~1.60 mA/V, good value for transconductance starts at 1.2 mA/V. Selected from a larger lot of NOS tubes.
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CV4004 KB/AD BRIMAR. GREY PLATE, RING GETTER. 1975 DATE CODES.
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One of the very fine sounding Ecc83. Lorenz was an old German firm in electron field. Twin mica support rods for less hum/noise.
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Tesla E83CC exclusive, rare matched pair. The tubes are new and never used. Ia1 = 1.2 mA, Ia2 = 1.34 mA. Ua = 250V, Ug1 = -2V.
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REAL MILITARY ISSUE 7025 = 12AX7A = E83CC. TESTED AT REAL-WORLD 500V POWER LEVELS ON AMPLITREX AT-1000. All our tubes are Tested on Amplitrex AT1000 Digital Tube Test System. PASSED THE AMPLITREX DIGITAL TESTS.
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The 12AX7 ECC83 E83CC type is a high-quality valve that is perfect for any preamp setup.
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Tube test NOS. NOS tubes fall within the Gm characteristic range of an average tube, as published in the RCA RECEIVING TUBE MANUAL, which states "Individual tubes, like any manufactured product, may have characteristics that range above or below the values given.
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