For example there is a 12AV5 ( beam tetrode ), 12AV6 ( double diode, triode ) and a 12AV7 ( double triode ).
2.
For example, the ECC83 ( equivalent to the 12AX7 ) is a 6.3V ( E ) double triode ( CC ) with a miniature base ( 8 ).
3.
Simple OTL amplifiers, for example Atma-Sphere M-60, employ 8 double triodes of 6AS7 type per channel; each continuously dissipates an average of 30 watts.
4.
For example, the 12BH7 ( double triode with separate cathodes ) counts the centre tapped heater as one useful element, whereas the 12BY7 ( pentode ) counts the centre tapped heater as two useful elements.
5.
The first requirement is typically solved with a long-tailed cascode stage ( 2 or 3 double triodes ), the second-with two cathode followers inserted between the driver stage and the power stage.
6.
For example, the 12AX7 is a double triode ( two sets of three electrodes plus heater ) with a 12.6V heater ( which, as it happens, can also be connected to run from 6.3V ).
7.
The first number is the ( rounded ) heater voltage; the letters designate a particular tube but say nothing about its structure; and the final number is the total number of electrodes ( without distinguishing between, say, a tube with many electrodes, or two sets of electrodes in a single envelope a double triode, for example ).
8.
A few special-quality tubes did not have a standard equivalent, e . g . the E55L, a broadband power pentode used as the output stage of oscilloscope amplifiers and the E90CC, a double triode with a common cathode connection and seven pin base for use in cathode-coupled control ) grid by changing the voltage on the third grid, in early computer circuits ( similar in function to the U . S . 6AS6 ).
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