321: Difference between revisions

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Early instances of the 321 (sn pre-720) use a  
Early instances of the 321 (sn pre-720) use a  
[[5718]] peanut tube as the front-end cathode follower.   
[[5718]] peanut tube as the front-end cathode follower.   
Later 321 and 321A use a [[7586]] Nuvistor for that role. Latest 321A use a FET [[151-1011]].
Later 321 and 321A use a [[7586]] Nuvistor for that role. Latest 321A use a FET [[151-1011-01]].
In several circuits, the 321 uses [[OC170]] transistors  
In several circuits, the 321 uses [[OC170]] transistors  
where the 321A uses [[2N2207]] transistors.   
where the 321A uses [[2N2207]] transistors.   

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