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TUBE vintage, US-made 9-pin miniature twin triode vacuum tube manufactured by General Electric. Originally engineered in the 1950s for industrial computing and switching applicatio ns, it is widely used today as a high-quality substitute for the common 12AU7 and ECC82 preamp tubes in audio equipment - Tube Type: Medium-Mu Twin TriodeBase Type: 9-Pin Miniature (Noval, E9-1)Electrical Equivalence: Directly swaps into 12AU7, ECC82 , and 5814A circuits.Heater Voltage: Can be wired in series for 12.6V (at 0.15A) or in parallel for 6.3V (at 0.3A).Special Cathode Design: Specifically engineered with anti-cathode poisoning properties. This allows the tube to remain biased "off" (cutoff conditions) for long periods without losing its emission capabilities or degrading Show more