Now, temperatures and their corresponding pyrometer filament currents are known and a curve of temperature versus current can be drawn.
2.
Little practical use was ever made of this property ( however early radios often implemented volume controls through varying the filament current of amplifying tubes ).
3.
Additionally the pre-amp uses four 12AX7 tubes simply because it has enough filament current to afford an extra so the V1 can be paralleled.
4.
The rheostat " "'R " 1 "'controlled the filament current, and in these early sets was used as a volume control.
5.
The user then reads the temperature off the filament current control dial, which is calibrated by the filament's current-vs-temperature curve . or in some instruments from a current-vs-temperature table.
6.
The "'6N1P "'has similar ratings to the 6DJ8 and in the past was sometimes rebranded as such, however differences between the two types ( the "'6N1P "'requires almost twice the filament current and has only one third the S value ) mean they are not directly interchangeable.
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