• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Interstage Transformer Nomenclature

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jlsem

jlsem

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Joined 2003
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Yamano's amp uses the 808 operated in Class A2 and the IT is configured as 2:1 stepdown with Shishido's inverted IT scheme, that is, the grid current from the 808 (indicated as 30ma @ +42 grid volts) balances the standing DC current (28ma) of the triode-connected 6L6GC's plate circuit. The Tango NC-10's primary inductance of 30H is just adequate for the driving tube's plate resistance. He could have used an NC-14 with 50H, or maybe even a PP IT such as an NC-22 with 300H primary inductance since it can stand a 3ma imbalance.

John
 
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