Yes the 604E ended production in 1974 I'm pretty sure.It was no longer available after that when they started phasing in the 604G's with the new Tangerine phase plugs circa 1975..As for the 21184 cones there has been 5 revisions of that cone that I'm aware of but could be more.. 21184-2,3,4,8 AFAIK..
AFAIK, the majority of 604G's have annular steel phase plugs. The cost cutting plastic plug came along in '76 near the end of 604G's production. Ironically, about exactly the same time period Urei abandoned them because of QC problems. While they weren't cataloged, i'm pretty sure you could get new 604E's into the 2nd half of the 70's. I don't pretend to know if 604E and 604G were produced concurrently or not. But, i suspect they were for at least a short period. They were still offering 605B's and 604G's at the same time in 1974.when they started phasing in the 604G's with the new Tangerine phase plugs circa 1975.
I probably shouldn't have used the word "revision" as it implies a change was made. I think the cones are all essentially identical, and those suffix digits indicate manufacturing lots, time periods, and possibly even various suppliers..As for the 21184 cones there has been 5 revisions of that cone that I'm aware of but could be more.. 21184-2,3,4,8 AFAIK..
IIRC, it was suggested to me that only the first few were used in production of drivers and cone kits, the remainders were in re-cone kits only.
It is certainly possible that cradledorf's E was an early one, and was re-coned at some point.
Last edited by bowtie427ss; September 10th, 2013 at 06:52 AM.
Not all vegetables make good leaders.
Isn't 21092 the actual VC and former, being separate from the actual cone, which usually is 21184-x
Hmmmmmmm, a "full kit" versus just a bare cone?Originally Posted by magnarc
Interesting.
Logical.
More confusing as the same kit number from different time periods could contain cones of different numbers. Kind of sounds like something Altec would have done.
Not all vegetables make good leaders.
As were mine.My 604G's have the annular plugs.. Another change was the new 23744 diaphragm... I'm almost certain that production of the 604E ceased sometime in late 1974 to early 1975.. The production of the units changed significantly from the gray/white color to the gray metallic color.. You could be right though... It would be interesting to see some date codes from some of the 604E units.. That would be the only way to know for sure IMHO, if someone had a unit with a late 70's date code.AFAIK, the majority of 604G's have annular steel phase plugs. While they weren't cataloged, i'm pretty sure you could get new 604E's into the 2nd half of the 70's.
Newest E I saw was dated 1976...not sure, but I recall seeing a pair with tangerines, it may have been that pair. We are talking 30 years and many speakers ago....
Your neighbors called. They like your music.
I heard the end of the G's were the first with the Tangerine.
Nothing like a great big pair of speakers to make your day.
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