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12AL5

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The 12AL5 (European type HAA91) is a dual diode vacuum tube with a miniature 7-pin base.

It is used as the "disconnect diode" in the timebase circuit of several tube-era Tektronix scopes.

Heater: 12.6 V, 0.15 A

System: max. 420 V peak, max. 9 mA, 2.5 pF

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