The development of the pentagrid or "'heptode "'( seven-electrode ) valve was a novel development in the mixer story.
2.
Following the voltage letter, " A " stands for a low-current ( signal ) diode section, " B " for a double diode with common cathode section, " C " for a triode section, " F " for a pentode section, " H " for a hexode or heptode section, and " L " for a power tetrode or pentode section.
मोबाइल