Quote Originally Posted by Earl K View Post
Steve Schell addressed some of this very question in this thread over at LHF .

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This seems pretty definative to my eyes .

Yet to be addressed ( with pics & measurements ) is Steves'/Roberts mention of the different phase plug found in the 804/605 duplex .

Also ( some conjecture ), the reworking of the 804 into the 806 may have triggered the development and introduction of the 23744 ( lite ) diaphragm ( to help restore the HF of the 806 back to the level of the previous generations, 802 ). Just a theory, mind-you

<> EarlK
Hey Earl, Actually the 23744 was developed for the 604-8G mid '70's and then found it's way into the all new 802-8G and then finally the later version of the 806-8A,B's IIRC.Then that was replaced with the 34647 with the new 902's again if recollection serves me correctly.