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DeonC 30th December 2012 10:58 AM

Help identify these Seas tweeters
3 Attachment(s)
Hi guys

I got these tweeters today. They look like they are 35mm domes. I want to use them as replacements for KEF T27 tweeters in a pair of KEF Concerto speakers. One of the T27s is blown, so I am replacing both with these. The pics are below.

Thanks guys,

StigErik 30th December 2012 11:07 AM

Might be a SEAS H087 ?

system7 30th December 2012 11:07 AM

Aren't those the old famous SEAS units that used to be fitted in Dynaco and B&O units in the seventies? They crossed over quite low (1.5kHz) on a single capacitor IIRC.

But I can't remember what they were called. :confused:

jonstar78 30th December 2012 01:21 PM

They are H-087 8ohm units!

system7 30th December 2012 05:02 PM

2 Attachment(s)
They (SEAS H087 or Dome H87) were used with a simple 1ohm series with 8uF capacitor and a 0.27mH shunt coil in the BeoVox 2702, which was a speaker I liked. Simple Cap and attenuator in the well documented Dynaco A25.

What is their DC resistance? No-one mentions it. For all that, a very different animal from the KEF T27. :)

DeonC 30th December 2012 07:35 PM

Thanks, guys. Now I can Google the specs, and then fit them. It will only be a temporary fit, because I found out tonight from a friend of mine that it will be relatively cheap to have the T27 fixed. Problem is the guy that can fix them is a few hundred miles away, so I'll have to send it via post. The Seas will be a temporary stop-gap measure. I just want to be able to match the sensitivity via an l-pad. Then I'll have to figure out what to do with them next. Maybe a Dynaco clone? We'll see. :) Thank you very much again.


PS. Someone seems to have measured their DC resistances, because the one has 6-ohm written on the back, and the other 5,9-ohm.

pdul 30th December 2012 08:10 PM

I have just salvaged 2 of those from some old B&O speakers, but it says 3ohm on the units:)

jonstar78 30th December 2012 11:02 PM

Madisound archive says 4.6 ohms coil resistance, which sounds about right...

jonstar78 30th December 2012 11:10 PM

Of course, if I hadn't messed up my first post by saying they were 8 ohms, that would make more sense.
They are indeed 6ohm impedance, 4.6ohm coil resistance.
If you Google seas h-087 then click the 'images' tab, you should find a picture of the spec list fairly near the top- I did...

kiwi88 27th July 2013 01:38 AM

B+O were 4 ohms

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