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OLD El-84/6bq5's were actually 7189's...

This means pin 1 and 2 were internally connected. As Eli sometimes mentions this was simply for cost and economy of scale... "if we tool up just for 7189's we won't have to change anything and the tube will always work"

The 7189A had BOTH pin 1 and 2 AND 6 and 9 internally connected SOOO,

if you want to use any variant of that tube One COULD wire the sockets together {1&2 and 6&9}.

Do not forget in certain circuits normal or modern 6BQ5's will NOT be able to handle the voltage... for very long in a circuit designed for 7189's and especially the 7189A.
The Mind has No Firewall~ U.S. Army War College.

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