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2A61: Difference between revisions
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plate-to-cathode voltage of about 100V. | plate-to-cathode voltage of about 100V. | ||
Starting with serial number 987, the front-end differential amplifier | Starting with serial number 987, the front-end differential amplifier | ||
was made with four [[7586]] nuvistor triodes. | was made with four [[7586]] nuvistor triodes: V424, V425, V524, and V525. | ||
The parallel combination of V424 and V425 forms one side of the differential amplifier | |||
and the parallel combination of V524 and V525 forms the other side. | |||
However, for purposes of thermal stability, V424 is thermally connected to V524 | |||
and V425 is thermally connected to V525. | |||
The tail current in the 987-and-up version is about 16mA | The tail current in the 987-and-up version is about 16mA | ||
and the nuvistors have a plate-to-cathode voltage of about 70V. | and the nuvistors have a plate-to-cathode voltage of about 70V. | ||