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The 6AU6 is used in the [[513]], [[561]], [[581]], [[585]] and others as an error amplifier, in the [[C | Type 53/54C]] plugin, and others. | The 6AU6 is used in the [[513]], [[561]], [[581]], [[585]] and others as an error amplifier, in the [[C | Type 53/54C]] plugin, and others. | ||
The 6AU6A is an improved version for equipment with series-connected heaters that | The 6AU6A is an improved version for equipment with series-connected heaters that has controlled warm-up and heater-to-cathode voltage rating increased to 200 V. The 6AU6WA is a ruggedized version. | ||
The 8425 (used in [[Q| Type Q ]]) is an improved successor version. | The 8425 (used in [[Q| Type Q ]]) is an improved successor version. |
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