ARINC signalling defines a 10Vp differential between the Data A and Data B levels within the bipolar transmission ( i . e . 5V on Data A and-5V on Data B would constitute a valid driving signal ), and the specification defines acceptable voltage rise and fall times.
22.
It was developed to eliminate the need for a driver tube in radios, and has rather more gain than is usual in a power pentode, producing full output from a relatively small drive signal ( the EL84 requires less than 4.4V rms for 5.7W output compared with 9V rms for 5.5W from a 6V6 or 8.7V rms for 11W from an EL34 ).
