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Thread: ElectroVoice T35 - anyone familiar with them?

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    Senior Member Fangio's Avatar
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    ElectroVoice T35 - anyone familiar with them?

    Went to a turning shop yesterday, to get some screwed up windings in 2307 horns renewed. The owner recognized the horns, he did the boring/tapping himself, and we had a nice little smalltalk about loudspeakers in the meantime. While I paid a little fee, he pulled 2 pairs of very dusty speakers somewhere out of the bottom drawer in a corner, admitting he used to build speakers himself, decades ago. These were from an unfinished project, I got them as a gift – "better than throwing away, have fun with them.."

    So, anyone familiar with EV, and these tweeters? I'm not. 8 ohms, they looked a bit like Klipschhorn tweeters (K-77 ??) to me, but those are usually black, not chrome.. OK, EV is wellknown, they build highend speakers too. Seems these could be used as replacement tweeters for Klipschhorns? Are they usable for anything else, and of any mentionable worth? Could do with a bit enlightening.. thanks.
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    Yes, the EV T35 series is used by Klipsch as the K77 series. They would go in your Klipschorns if the impedance is correct. Diaphragms are readily available. Yours are the earlier Alnico version.

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    Senior Member oznob's Avatar
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    As I recall, the T-35 and K-77 are the same tweeter and were used in the Klipsch Heritage line as well as in early EV's. The T-35 was the EV model number and K-77 were designated for Klipsch. I think those are Alnico's and they later went to a square ceramic magnet. If the diaphragms are good, you could probably get a decent price for them on ebay.

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by Fangio
    So, anyone familiar with EV, and these tweeters? I'm not. 8 ohms, they looked a bit like Klipschhorn tweeters (K-77 ??) to me, but those are usually black, not chrome..
    EV offered them as OEM versions in all black with a stamped horn I believe, the horn was certainly thinner walled and they had a brass colored magnet cover. This version was available through some speaker vendors and was the version that Klipsch used. EV also offered them as component speakers with nice cast horns that were chrome with matte black interiors like the ones you are showing. They were later updated as the T-35A... I don't know the difference, but they looked identical to the T-35 you are showing. Later they were offered with a rectangular ferrite magnet but still called the T-35A. All of these were available either as the satin black painted OEM version or the more deluxe component version in chrome.


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    Maron Horonzakz
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    The T35 is not a very good tweeter. Most start taking a dive at about 10K Klipsch would select those that would make it to 15K and send the rest back. I have a pair tested in a anechoic chamber just makes it to 10k I replaced the diaphrams & now get 14k. Diaphrams are inconsistent due to phenolic weight and thickness. The newer T35/ k77 today will get 15k to 17k. This tweeter should have been retired along time ago.

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    Senior Member Fangio's Avatar
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    Quote Originally Posted by Maron Horonzakz
    The T35 is not a very good tweeter. Most start taking a dive at about 10K ... This tweeter should have been retired along time ago.
    OK, thanks gentlemen for the hints. Thought it might be worth to keep them, could be usable for a yet unborn custom project in future.. So Maron, you suggest I throw them away now?

    Checked ebay, not one pair looked the same like the others, seems there are quite a lot versions. One seller in HongKong offered them for 350$. That seemed a bit too optimistic.

    Phenolic diaphragms? Couldn't resist to have a look inside.
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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by Fangio
    Checked ebay, not one pair looked the same like the others, seems there are quite a lot versions. One seller in HongKong offered them for 350$. That seemed a bit too optimistic..
    The more common T-35s I've seen are much narrower than yours. The one you showed which clearly states T-35 looks like the T-35As... As far as I know there are only four versions. The Narrow T-35, the later T-35 that you have, the T-35A which looks identical, and then the ferrite T-35A. These in turn are all available in the OEM and component versions.

    There is another model called the T-350... it is vastly superior. It looks similar and uses the same diaphragm, but has a much larger magnet and larger horn.

    Quote Originally Posted by Fangio
    Phenolic diaphragms? Couldn't resist to have a look inside.
    Did you break the voice coil leads? It doesn't appear that your opened tweeter will work now.


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    Senior Member Fangio's Avatar
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    Very impressing, Mr. Widget. Thanks for sharing your knowledge.
    Quote Originally Posted by Mr. Widget
    Did you break the voice coil leads? It doesn't appear that your opened tweeter will work now.
    There came no cheep at all out of them, when connected to an amp. Also I couldn't measure any DCR before I opened one. There were no leads to break, looked like been opened before.

    There are for sure EV fans who have better use for spares of these. Seems the best I put them on the bay, and declare them as not functionally.

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by Maron Horonzakz View Post
    The T35 is not a very good tweeter. Most start taking a dive at about 10K Klipsch would select those that would make it to 15K and send the rest back. I have a pair tested in a anechoic chamber just makes it to 10k I replaced the diaphrams & now get 14k. Diaphrams are inconsistent due to phenolic weight and thickness. The newer T35/ k77 today will get 15k to 17k. This tweeter should have been retired along time ago.
    Quote Originally Posted by Zilch View Post

    Nobody's been able to replicate EV's curves for T35 thus far, +/- 1.5 dB from 3.5 - 15+ kHz. Maybe if it were mounted on the requisite baffle:
    Zilch's image posted below... this post taken from Storm's Altec +EV thread.

    Below that I have posted a plot of three T-35s. The blue and green T-35s were taken from my Klipsch Belle clones and have been babied their whole lives so I'd suggest their response is likely as new... the red plot is from a K-horn... I have no idea how hard it may have been driven.

    I'd say that for a bunch of vintage drivers these are following their original specified curve better than most that we see here and for the record, I'd say these are not the terrible tweeters that Maron and Zilch seem to think they are. I guarantee they produce higher frequencies than many here can actually hear.


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    Quote Originally Posted by Mr. Widget View Post
    I'd say that for a bunch of vintage drivers these are following their original specified curve better than most that we see here...
    What I'm amazed by is the fact that those old published curves are nearly identical to those produced by the latest state of the art measuring equipment!

    John

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    RIP 2011 Zilch's Avatar
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    What are the measurement conditions, Widget? Do you have them on a baffle, or just freestanding on a pedestal?

    I'm just setting up to remeasure the pair I have here (courtesy Jackgiff) for another project, actually.

    If I still get the same result as originally, I propose we swap T-35s and each measure the other's samples....

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    T35 reputation in the '60s and '70s compare to 075

    Quote Originally Posted by Mr. Widget View Post
    Zilch's image posted below... this post taken from Storm's Altec +EV thread.

    Below that I have posted a plot of three T-35s. The blue and green T-35s were taken from my Klipsch Belle clones and have been babied their whole lives so I'd suggest their response is likely as new... the red plot is from a K-horn... I have no idea how hard it may have been driven.

    I'd say that for a bunch of vintage drivers these are following their original specified curve better than most that we see here and for the record, I'd say these are not the terrible tweeters that Maron and Zilch seem to think they are. I guarantee they produce higher frequencies than many here can actually hear.


    Widget
    The EV T35, and especially the K 77 (because of Klipsch's testing and selection procedures), had a good rep, better than the JBL 075, among the dealers and engineers in the S.F. Bay Area (Berkeley Custom, Pro Audio, etc.) in the '60s and '70s. Their stores all carried both the K77 (in various Klipsch speakers) and the 075. In one case, I found my then young ears could hear a 16 K Hz tone from behind a Klipsch Cornwall (which used a K 77).

    The curve Berkeley Custom Electronics ran looked a lot like the red curve in Mr. Widget's post. Widespread opinion was that the K 77 was smoother sounding than the 075.

    As to the subjective nature of the sound, EV T35s and JBL 075s were both often turned up too far in demos. This certainly made both the EVs and JBLs sound too bright or, worse, "shrill." I believe (if memory serves) that all of the EV speaker systems (including the "building block" kits) had a "brilliance" control for the tweeters; the JBL networks had a balance control on the crossovers used with the 075, as well. Paul Klipsch never allowed one on his speakers, precisely because for this maladjustment reason. On the Klipsch factory anechoic of the Klipschorn I saw, the tweeter response was in a straight "average" line with the response of the midrange.

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