early CTS Alnico magnet 1½" dome tweeter from ADC 303A Brentwood speaker, 1967

Description

Offered for your consideration is one
CTS
Alnico magnet 1½ inch dome tweeter
that was manufactured for Audio Dynamics’
ADC 303A
speakers in 1967. As you probably know, CTS was a major supplier to the domestic speaker industry from the late 1950’s through the 1970’s. Based on the EIA source/date code on the large magnet cover, “137 706”, this tweeter was made by CTS (137) in the 6th week of 1967.
I had never seen a CTS dome tweeter previously, so I believe this is a rare high frequency unit. I’ve owned ADC 303A’s made a few years later and they did
not
use this dome unit but rather CTS paper cone tweeters, so if you're buying it to replace a blown tweeter in your 303A be certain this is the version that you need.
Please see my large photos and read the remaining description to decide if this uncommon CTS dome tweeter is correct for your needs.
This tweeter is in clean, excellent condition. The clear poly dome with poly suspension ring is in great shape with no dents or dimples, just some errant factory assembly adhesive visible. Also, the upper perimeter plate had a bit of rust so I carefully unscrewed it from the frame, cleaned it, and then applied a few light spray coats of matte black enamel before reinstalling.
In addition, the anodized steel basket and magnet cover have only light oxidation and there’s some factory assembly glue visible. Plus, the magnet cover has aluminum dust shields which add a very nice touch. And, I’ve left a good,
usable
length of the factory +/- terminal input wires for the new owner’s convenience. Overall, this early CTS dome tweeter is quite nicely preserved.
Most importantly, it’s been fully tested and sounds very clear and detailed with crisp highs rated to a sparkly 20kHz by ADC. Plus, I tested its DC resistance at 6.9Ω consistent with a nominal 8 ohm driver rating. And, the black faceplate measures 3½” in diameter, the galvanized steel flange is 4” diameter, and the whole assembly stands just over 1⅝” tall.
Lastly, there are
no mount holes on this tweeter design
—it is secured from the rear of the ADC 303A cabinet with retention clips. For anyone considering this tweeter for a speaker-building project, I still have those cabinet mount retention clips and will include them if you ask for them in writing at time of purchase.
So, as pictured and described, this early, scarce CTS dome tweeter made for ADC is offered at a competitive price.
Terms of Sale
:
I encourage interested parties to ask any questions they may have about this listing before committing to purchase.
Payment is due at checkout by
PayPal
. U.S. mailing addresses will pay .95 for very carefully packed shipping via U.S. Postal Service or FedEx with tracking and delivery confirmation. International purchases accepted only from those who are able to pay with
PayPal
including shipping by U.S. Postal Service First Class Parcel Air Mail. Thanks for looking!
*
the cabinet decal photo is presented only for donor model reference