8056

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Revision as of 10:35, 22 February 2021 by Vintage dave (talk | contribs) (not used in late W)
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Nuvistor 8056

The 8056 is a low-voltage Nuvistor triode with a 6.3 V heater.

It is used in the 422, 502, early W, 1S1, 3A7, early 3S3, 3T4, 5T3, and 10A1. It can sometimes be replaced with a MPF102 FET.

The 8056 has a maximum plate-to-cathode voltage of 50 V. Contrast this with another Nuvistor triode, the 7586, which has a maximum plate-to-cathode voltage of 110 V.

The 7586 and 8056 have the same pinout, but the two tubes are not interchangable since they have different voltage ratings.

For example, in the front-end cathode followers of the 3A1, the plate voltage of the 7586 tubes, V113 and V123, is 55 V, and possibly a bit higher during warm-up. This exceeds the maximum plate voltage of the 8056, unless the 3A1 is modified for lower front-end plate voltages.

Tek part number: 154-0417-00

Aged/Checked/Matched Pair Details
Used in Tek Part# S/N Range
502, W, 3A7, 10A1 157-0099-00 All

Reference:

Tube aging procedure / Selection and checking procedure

Links