RS1003 Siemens SRS 551 Audio Output Tube
Siemens RS1003, indirectly heated long life pentode. Transmitting tube which is often seen in professional broadcast equipement, very suitable for audio amplifiers, SE or PP, sound really nice triode strapped in push-pull amplifiers. East Germany equivalent is SRS 551 by RFT. Plate dissipation up to 60 Watts in class C.
Closely matched pair, within 1%, almost identical tubes!!!
Tube data for class C CW mode (max):
Ua = 1000V, Ug2 = 340V, Ug1 = -45V, Ia = 215mA, Ig2 = 29mA, Ig1 = 14mA, Pout = 155W, Pg2 = 10W, Pa = 60W
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