What Did Heath Use 511A's For?

[Old Guy]

They were never used in any Cabinet...

I've gotten gun shy about the word "never". Not fond of egg on my face.

I have to say somewhere somebody may have used the brackets in a cab. But have never seen it.. And if you mean Altec never did, am 99.999999 % sure you are right. As GM showed, Heath did use the 511A in cabs.