| Inter-stage transformer | ||||||
| Name | Primary impedance Zp | Driver management | Data | |||
| NC-20 | 5kΩ rp=1～10kΩ | 6AH4,6V6(T) 5687,6463 |  |
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| NC-14 | 5kΩ rp=3～7kΩ | 6V6(T),5687 6F6(T),6350 | ||||
| NC-16 | 7kΩ rp=5～10kΩ | 6SN7,76 12AU7,6350 | |
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| ※Combining driver tube, recommended in the range of value of the plate internal resistance rp is are described in the field of Zp. | ||||||
