'73 as evidenced by the square QC/inspector's stamp.
Right, my '55s are black crinkle.Originally Posted by Old Guy
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
'73 as evidenced by the square QC/inspector's stamp.
Not all vegetables make good leaders.
great minds think alike
Your neighbors called. They like your music.
What about the early cone part number then?
Most 515B are 21184.
Works for me since a NIB matched pair of '71 421-8H [391142] have this version of the stamp.
WRT any diaphragm assy. anomalies, no clue about this one, but do know from experience that if a new driver was spec'd to either replace an earlier version and/or to match up with a very high output impedance system there was no telling what was required to get the right 'balance' of specs with then available parts.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
What time period was the square stamp used ?
I have a square QC stamp on my 64 604E, but mine doesn't have a line through the middle of it.
Is the cone number 21184 with no additional revision numbers(without -2 or -3 after it)?
Out of curiosity, how do you know it's '64 and not '74?
Mid 60's(nobody seems to know exactly when they started) thru 1980-81.What time period was the square stamp used ?
Not all vegetables make good leaders.
You are assuming it is early. It likely is not. The 75 cone number I posted above is almost the same. 21090 for this one. 21092 on the 1975 sheet.
Your neighbors called. They like your music.
I guess I automatically assumed that as they progressed through the years that they no longer made the old models. That's why I figured that a 515 B was an early driver. I was not aware that they continued to make "B" models all the way into the 70's. I was wrong my 604 does have a line through the QC mark. and the cone number appears to be followed by a 3. I do not know whether it's a 64 or 74 other than I figured once they started making the g's h's and k's that they no longer made the E models.
Last edited by cradeldorf; September 9th, 2013 at 05:17 PM.
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