• High-Voltage Tested at 550 V

    Unlike a simple emission or low-voltage tube test, these EL34/6CA7 tubes are measured at a plate voltage of 550 V.

    Test conditions:
    Ua = 550 V · Ug2 = 300 V · Ug1 = −25 V

    Both plate current (Ia) and transconductance (Gm/S) are measured.
    Matched pairs are selected for close agreement of both values under exactly the same high-voltage test conditions.

    • 1 x Siemens EL34

    Siemens 6CA7 EL34
    CONDITION & IDENTIFICATION
    Condition unused
    Original print Perfect, fully preserved
    Remarks RFT production tube
    TEST RESULTS
    RoeTest V11
    Parameter Tube Datasheet (100%)
    Ia – Anode Current 36,0mA 30.0 mA
    Gm – Transconductance 5,400 µmhos 5,000 µmhos
    Manufacturer Tolerance (Datasheet)    Ia:   |   Gm:


    Ia = Anode current:
    This value indicates the anode current at the specified operating point. A deviation from 100% does not by itself indicate a weak or worn tube. Ia alone provides no reliable information about remaining service life.