MartyOriginally Posted by Marty
Thanks for your advice.
Give me a few days and I will post some pics to answer your questions. It is some time since I checked them out.
Am pretty busy on a non-audio project just at present.
Regards
Ted
MartyOriginally Posted by Marty
Thanks for your advice.
Give me a few days and I will post some pics to answer your questions. It is some time since I checked them out.
Am pretty busy on a non-audio project just at present.
Regards
Ted
It confirms my impression that this is a manufacturer of OEM components, to order, in volume, and they have NO interest in selling low quantities to end users.Originally Posted by pangea
Ask them their minimum order quantity to set up and manufacture any particular design.
I would also inquire as to their program for handling the toxicity issues....
Widget....(just got home from a long trip) That Ev T35 frequency sweep chart Is mine on my T35 tweeter. It was done in St Louis at CID Central Instatute of the Deaf. Many many years ago. John Warren used it for an article on that tweeter. I still have that tweeter. The phenolic/linnen are original. That is a typicle response curve on those T35 tweets. We were doing tests on Chinchila,s (At max spl). I wont go into details.
Is it a pretty chrome one or one of the black OEM versions? If it is a chrome one I'd put it on display... OEM, well they go for $75 on eBay.
Widget
I just ran across this site. The fellow offers MP3 files of old 78rpm discs. He uses a Western Electric 4A "cartridge", which was the original Vitaphone unit. Check out his analysis of the spectral content of the Vitaphone discs, which seem to die above 5kHz.
No wonder the 596A/597A mostly reproduced noise!
http://www.meloware.com/vitaphone/repro.htm
And the selling price for the W.E. driver is:
$8600.00
one could buy a nice car a complete stereo and go to the pub for about a year for that but no! buy a 70 year old tweeter instead!
Ted:Originally Posted by aust-ted
Looking forward to some pictures & details !
I've been looking at VC diameters of 1950s Fisher, University, & Magnavox horn tweeters:
Both the University horn & 'Sphericon' (lower right) tweeters had 0.75" Voice Coils,
while the others were 1" - all are phenolic material
Steve:Originally Posted by Steve Schell
The 4A sound has lots of character and very true spectral fidelity.
BELL LABS Engineering Board meets:
Chairman: "What are we going to do about the disc hiss above 5 kilocycles ?"
Bostwick: "Sir, I propose we reproduce it with the world's most expensive Supertweeter."
Chairman: "Excellent idea Bostwick; by the way, what's a Supertweeter ?"
Picture inside Bell Labs:
Marty, first my apologies for the late response.Originally Posted by Marty
Now have been able to take some pics so here they are.
Firstly a side view of the WE 597A
Secondly a pic of the diaphragm. As I mentioned earlier the voice coil has become detached. The surround of the diaphragm appears to be flat.
Thirdly the detached voice coil
Regards
Ted
Here are some more pics
Firstly the voice coil terminal block
Secondly the model plate
Thirdly the horn
Forthly with horn removed
Will also post some pics of the related horn.
Regards
Ted
Here are some pics of the woofer. As I mentioned earlier the model plate has been removed from the back.
Would appreciate any further help in identifying it .
Regards
Ted
Thanks for photos !Originally Posted by aust-ted
What is VC Diameter of tweeter ? horn throat dia ? Mouth dia ? horn length ?
__________________________________________________ _______________
TA 4151: 120v @ .5A field supply."Low frequency unit, 'Wide Range' systems", continuous rating 15 watts. Weight 43lbs.
TA 4151A: "Same as 4151 except has improved diaphragm for more uniform frequency response".
TA 4153: 120v @ .25A field supply; "Has 'Tim-Flex' diaphragm, mounts on flat baffle". 15 watts. Weight 30 lbs
TA 4153A: "Same as 4153 except has improved diaphragm for more uniform frequency response".
So the 4151 is HEAVIER than the 4153 !
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Hi Ted, that woofer is one of the smaller size Auditorium Series drivers built by Jensen in the 1930s. It was probably supplied to ERPI (many were), and likely had a round ERPI black and silver paper label attached to the flat area on the rear of the pot. Looks to me like someone repaired the original cone at some point by adding a leather surround. These cones originally had a paper hinge.
[QUOTE=Marty]Thanks for photos !
What is VC Diameter of tweeter ? horn throat dia ? Mouth dia ? horn length ?
Marty
As far as I can measure the VC diameter is 1",horn length about 4 3/4 inch (from where diaphragm is mounted) and horn mouth diameter 2 1/4".
I do not want to remove the diaphragm in case I damage it so I can only guess the horn throat diameter is about 3/8".
Hope that helps.
Regards
Ted
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