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I found this link scrounging aropund on the internet. I think I have a paper copy of the same catalog right here. Check for Utah speakers pg 60 of the pdf. As I understand the story, the Teledyne-branded electronics were something of a "house brand" for Olson, made under contract by AR.
Edits: 03/16/15Follow Ups:
Wish there where still stereo shops like that today, with shelves of amps and speakers ready to play at the push of the selector buttons.
the the MK-17s I had back in the day? Specs seem quite similar.
The MK 17 had a slightly more elaborate cabinet with a decorative molding around the front than the WD 90 But they were the same speaker inside.
The confusing part is that there was a variation using the same three drivers with a port and a slightly bigger box, and another variation with horns replacing the big cone mid and tweets, and still another variation that had 2 cone tweets but no mid as such.
If you read the specs on the ones with the 8-inch cone mid, it says the crossover frequencies were at 2500 wnd 3500 Hz, so it really added only a short (but important) frequency range. The paper-cone Utah 12-inch woofer was able to play quite high up compared with current 12-inch speakers (or even most avilable then), and then roll off smoothly without so much as an inductor. Part of the genius is in a design that required few crossover parts. Raw Utah drivers were well suited to simple DIY systems that did not get bogged down in a lot of esoteric crossover theory. That is where the David Weems books come in that used Utah-made Radio Shack drivers.
For fans of low-wattage tube amplication, I read that the Utah speakers are a very fine match, as they are far more efficient than most acoustic suspension designs being built in that time period.
The AS-2A are singing now with the foster tweeters installed using a 1.0 uf capacitor. Primitve crossover, but decent results! I also added some pillow fiberfill to the cabinets under the single panel of insulation.
Good learning experience for me. I installed the fosters initially in reverse polarity to the original tweeters and think I heard a improvement when I corrected that mistake, less distortion in upper vocals. Is phase involved there or was it my imagination?
"When the demon is at your door, in the mornin' it won't be there no more"
Steely Dan
Keep in mind that with a simple one cap crossover at 6 db per octave and a paper-cone woofer that is rolling off without am inductor, both the tweet and what is really a mid-woof are playing together over a substantial portion of the same important mid range. This is fine except it would not be great if the two were pulling in opposite direction over that same range...hence an accidental reverse polarity ould be a real issue.
Enjoy
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
I learned how to wield a soldering iron building a Heathkit shortwave radio, and my first stereo was from an Olson's store. Those got me hooked on electronics, which turned into a career. So I read these old catalogs with great nostalgia. Thanks for posting.
Boy does this bring those back.Notice that they didn't rate things in RMS power in the catalog? I used to drool over this and the Lafayette catalog but not like the Heathkit catalog.
MICHIGAN
ALLEN
PARK
15847
Southfield
Rd.
48101
(313)
388
-9150
BLOOMFIELD
HILLS
1990
Woodward
48013
(313)
334
-4759
DETROIT
29097
Dequinche
Rd.
Madison
Hts.
Michigan
Opening
Oct
'73
DETROIT
15620
Grand
River
Ave.
48227
(313)
838
-0777
DETROIT
14243
Gratiot
Ave.
48205
(313)
372
-1317
LIVONIA
19045
Middlebelt
Rd.
48152
(3131477
-0210
MT.
CLEMENS
37627
Gratiot
Ave.
48043
(313)
463-7074
WESTLAND
200
North
Wayne
Rd.
48185
(3131
722
-344
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
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