tarfilled 4 bolt 1005b w/ 183-294 on throat
Hi to all,
My first post and finally registered here...i have a really old tarfilled altec 1005b, but it's a 4 bolt pattern, and the brass throat has 183-294 cast into it... i was wondering if this is an early jbl or WE throat on a tar filled 1005b... the throat looks native to the horn...anyone have any info... thanks
AG
four holes for mounting which Altec driver?
Firstly a tar filled 1005B is just a 1005. The four bolt holes exhibited on the 183-294 throat adapter is also present on the Altec 32A horn that has a 2" entry and has the same bolt circle diameter as the WE 594A. These four holes can also accept a 27A adapter. So what is the mysterious driver made by Altec that has a 2" throat and a four stud mount on a BCD of 3-3/8"?:banghead: Why, the Altec 594B of course!:applaud:
The Altec 594B driver is described in a 1966 issue of the AES journal in an article entitled "Development of a Horn Type Moving Coil Driver Unit". This relatively unknown driver was an alnico version of the WE field coil unit. It was the first driver to use an elastomer compliance for suspending the aluminum diaphragm in order to guard against fatigue and failure in high power use. This non-resonant compliance also reduced distortion. This model of driver was manufactured in limited quantity and sold to the government for high power acoustic testing in facilities such as White Sands.
The development program for this driver was headed by John Hilliard and the design and prototyping was undertaken by Jonas Renkus. This relates to the use of elastomer compliances on early Emilar and Renkus-Heinz diaphragms.