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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 [[10A1]], [[422]] and the [[5T3]].
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.
It can sometimes be replaced with a [[MPF102]] FET.


The 8056 has a maximum plate-to-cathode voltage of 50V.
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 110V.
(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,
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.


The 7586 and 8056 have the same pinout, but the two tubes are not interchangeable 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
{| class="wikitable"
{{Checkedtubes TableHeader}}
|-
|  [[502]], [[W]], [[3A7]], [[10A1]] || 157-0099-00  || All
|}
{{Tube aging reference}}
==Links==
==Links==
* [http://w140.com/8056.pdf RCA 8056 Datasheet (PDF)]
* [http://w140.com/8056.pdf RCA 8056 Datasheet (PDF)]
* [http://w140.com/8056-siemens1964.pdf Siemens 8056 Datasheet (PDF)]
* [http://w140.com/8056-siemens1964.pdf Siemens 8056 Datasheet (PDF)]
* [http://w140.com/RCA_Nuvistors.pdf RCA Nuvistor Reference (PDF)]
* [http://w140.com/RCA_Nuvistors.pdf RCA Nuvistor Reference (PDF)]
* [https://www.radiomuseum.org/tubes/tube_8056.html 8056] @ radiomuseum.org
* [[tube:8056|8056 @ radiomuseum.org]]




[[Category:Triodes]]
[[Category:Triodes]]
[[Category:Nuvistors]]
[[Category:Nuvistors]]

Revision as of 00:09, 24 February 2021

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 (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, but the two tubes are not interchangeable 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