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Vintage dave (talk | contribs) (157-0099-00 selection procedure exceeds tube max ratings!) |
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[[File:Nuvistor 8056.jpg |thumb|350px|right|Nuvistor 8056]] The '''8056''' is a low-voltage [[Nuvistor]] triode with a 6.3 V heater. | [[File:Nuvistor 8056.jpg |thumb|350px|right|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 is used in the [[422]], [[502]], early [[W]], [[1S1]], [[3A7]], early [[3S3]], [[3T4]], [[5T3]], and [[10A1]]. | ||
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The 8056 has a maximum plate-to-cathode voltage of 50 V. | The 8056 has a maximum plate-to-cathode voltage of 50 V. | ||
Contrast this with another Nuvistor triode, the [[7586]], | Contrast this with another Nuvistor triode, the [[7586]], which has a maximum plate-to-cathode voltage of 110 V | ||
which has a maximum plate-to-cathode voltage of 110 V | (however, one of the 8056 test conditions for 157-0099-00 puts 100 V on the plate.) | ||
( | |||
The 7586 and 8056 have the same pinout, | The 7586 and 8056 have the same pinout, but the two tubes are not interchangeable since they have different voltage ratings. | ||
but the two tubes are not | |||
since they have different voltage ratings. | |||
For example, in the front-end cathode followers | For example, in the front-end cathode followers of the [[3A1]], the plate voltage of the 7586 tubes, | ||
of the [[3A1]], the plate voltage of the 7586 tubes, V113 and V123, is 55 V, | V113 and V123, is 55 V, and possibly a bit higher during warm-up. | ||
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. | ||
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 | Tek part number: 154-0417-00 | ||