As nouns the difference between heptode and heptade
is that heptode is a compound thermionic valve containing a triode and tetrode; was used in superheterodyne radio receivers while heptade is a sum or group of seven.
heptode
English
Noun
(head)
a compound thermionic valve containing a triode and tetrode; was used in superheterodyne radio receivers
See also
* pentagrid converter