WMcD Posted November 2, 2017 Share Posted November 2, 2017 Questions come up occasionally regarding the K-77. It is a rebranded EV T-35 which passed strict Klipsch QC. According to an article, PWK selected the EV after EV adopted the Avedon phase plug. It was first used in a K-Horn in October 1959. University eventually acquired EV and published a spec sheet which is more elaborate than what EV published. My read is that horizontal coverage is greater when the unit is oriented with the long axis vertical -- i.e. that the patterns shown were obtained with the unit oriented as shown in the picture. Per the timeline for K-Horns: The first three-way Klipschorn incorporated a Jensen RP203 tweeter. This tweeter came from the famous Jensen G-610 Triaxial 15" driver and required considerable negotiations with Jensen. It was not until mid-1952 that all Klipschorns were three-way. A two-way Klipschorn with response to 12Khz was generally adequate for program material up to that time. The University MID-T- 4401 replaced the Jensen unit as the tweeter of choice later in 1951. WMcD T35A University Spec Sheet.pdf T35A EV Spec Sheet.pdf Avedon Design Patent on T35.pdf Early T35.pdf EV Avedon T35.pdf 2 Quote Link to comment Share on other sites More sharing options...
DizRotus Posted November 4, 2017 Share Posted November 4, 2017 @WMcD When did University acquire EV? I see it’s part of Bosch now. I miss the 600 Cecil St., Buchanan, MI days. Quote Link to comment Share on other sites More sharing options...
WMcD Posted November 5, 2017 Author Share Posted November 5, 2017 Thanks DizR. I should not have jumped to that conclusion. There is some information on EV on Wikipedia but I don't find anything informative about University Sound on the Internet. It does seem safe to say that Mark IV acquired University, based on the spec sheet. The address given is the same as for EV. Probably they were sister corporations for a time. My thought is that maybe Mark IV used the University name to market EV drivers and take EV out of that line of business to the extent it still existed. WMcD 1 Quote Link to comment Share on other sites More sharing options...
DizRotus Posted November 5, 2017 Share Posted November 5, 2017 I recall University from the days (in the 50 s & 60s) when I would read the Allied Radio catalog over and over. University and Utah stand out as makers of raw drivers in those days. Quote Link to comment Share on other sites More sharing options...
WMcD Posted November 5, 2017 Author Share Posted November 5, 2017 Do you know about this website? http://www.alliedcatalogs.com/ WMcD 1 2 Quote Link to comment Share on other sites More sharing options...
DizRotus Posted November 5, 2017 Share Posted November 5, 2017 Yes. Thanks for posting. Quote Link to comment Share on other sites More sharing options...
JohnA Posted November 6, 2017 Share Posted November 6, 2017 The dispersion of the T-35 is wider with the long axis vertical, below 5000 Hz. If you look through several of the documents, you will see that the T-35 also got the T-350 diaphragm at some point. I think it was when the K-77 turned into the K-77-M. From that I deduce the K-77-M gets the T-350's 10 watts continuous/50 watts Program/100 watts peak rating. Naturally, the peak rating is a uselessly short duration. I wouldn't test it. Quote Link to comment Share on other sites More sharing options...
babadono Posted November 10, 2017 Share Posted November 10, 2017 On 11/5/2017 at 12:04 PM, WMcD said: Do you know about this website? http://www.alliedcatalogs.com/ WMcD I did not, but WOW what a walk down memory lane. Thanks @WMcD Do you know what era (years) EV put the 30" woofer in the Patrician? Quote Link to comment Share on other sites More sharing options...
WMcD Posted November 10, 2017 Author Share Posted November 10, 2017 Was that the Patrician IV? 1 Quote Link to comment Share on other sites More sharing options...
Deang Posted November 10, 2017 Share Posted November 10, 2017 18" woofer in the Patrician IV, and 30" woofer in the Patrician 800. Quote Link to comment Share on other sites More sharing options...
billybob Posted November 10, 2017 Share Posted November 10, 2017 While looking at my mono speaker the other day wondered why the Wolverine by EV T-35 was oriented vertically and positioned behind the woofer some mounted to the floor of speaker by a bracket that looked not homemade. It is a smallish lower slot ported speaker that as a 2 way is well, wonderful. Interesting! Edit: TW-35 Quote Link to comment Share on other sites More sharing options...
DizRotus Posted November 11, 2017 Share Posted November 11, 2017 12 hours ago, billybob said: While looking at my mono speaker the other day wondered why the Wolverine by EV T-35 was oriented vertically and positioned behind the woofer some mounted to the floor of speaker by a bracket that looked not homemade. It is a smallish lower slot ported speaker that as a 2 way is well, wonderful. Interesting! Edit: TW-35 Billy, Would you be able to post photos of your EV speaker? EV’s history as a Michigan company, as well as its association with Klipsch, has always interested me. OBTW, the T-35 (K-77) was always intended by EV to be vertically oriented. The dispersion was said to be better. Early on, PWK decided it didn’t “make a dime’s worth of difference” so it was rotated 90 degrees in Klipschorns so as to be able to produce a single model for stereo pairs, rather than mirror imaged pairs with vertically oriented tweeters to the left or right of the squawker horns ( as did Speakerlab in their knockoffs). In this case he was right; it did not make a dime’s worth of difference sonically, while saving many many dimes in production and marketing costs. Quote Link to comment Share on other sites More sharing options...
billybob Posted November 11, 2017 Share Posted November 11, 2017 Some good history Neil. Not certain about the Vertical Cornwalls but, may have the K-77. Do think it is real that the TW-35 has a smaller magnet than the K-77, as mentioned in an advert saw online recently. Photo I have on this computer has files scattered about but will try and find. Hope I do not stray far from OP's original intent. Quote Link to comment Share on other sites More sharing options...
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