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[Whit Hutchinson]

http://dallas.craigslist.org/dal/msg/1501170868.html


Im pretty sure that is a smoking deal if the working ones are still in decent shape.  

Now it's up to you to keep them running

[Milt Hathaway]

Heh, I used to have two of those, along with two of the lenses.

Amazingly, we eventually sold them to a C&W club band.

The innards were very cool, however.

I don't think I need any now though. Thanks.

[Whit Hutchinson]

I wish I had a use for them or lived closer to texas.  I would have 4 in my basement if nothing else other than to have them.  They are a rare find these days.  

I swear I wish that tom danley guy would get off his lazy ass and do them again  

[John Halliburton]

Ask if the motors are still working on them.  After that, cones and belts are the next things to check.  

They can be rebuilt, but getting motors fixed would be the major hurdle. Finding surplus might be easier.

$275 for a working BT7 is a deal.

Best regards,

John

[Art Welter]

John Halliburton wrote on Mon, 28 December 2009 18:54

Ask if the motors are still working on them.  After that, cones and belts are the next things to check.   They can be rebuilt, but getting motors fixed would be the major hurdle. Finding surplus might be easier. $275 for a working BT7 is a deal. Best regards, John

The BT-7 is basically the same horn as the Lab Sub, and it is not difficult to retrofit the chamber for Lab 12 speakers.

If I needed subs, I’d be inclined to by the lot, retrofit them with Lab 12s, then sell off the Servodrive parts which are Unobtanium now.

Art Welter

[Ivan Beaver]

Art Welter wrote on Mon, 28 December 2009 21:03

John Halliburton wrote on Mon, 28 December 2009 18:54 Ask if the motors are still working on them.  After that, cones and belts are the next things to check.   They can be rebuilt, but getting motors fixed would be the major hurdle. Finding surplus might be easier. $275 for a working BT7 is a deal. Best regards, John The BT-7 is basically the same horn as the Lab Sub, and it is not difficult to retrofit the chamber for Lab 12 speakers. If I needed subs, I’d be inclined to by the lot, retrofit them with Lab 12s, then sell off the Servodrive parts which are Unobtanium now. Art Welter

Are you sure the lab 12's will fit?  The original "drivers" in the servo products were 15" cones-but no magnet structure and the chambers behind the rear of the cones were very close to the rear of the speaker frame.

In my SDL5s the bolts that attached the rotary to linear converters actually dug little holes into the wood in the back.   In those cabinets, there was no way you could fit a lab 12.  Maybe there is more room in the BT7's, but I am not inclined to believe there is.

Maybe you could fit a very shallow 12", but then the parameters may not be right for the particular horn used in the BT7-but you might get lucky.

[Art Welter]

Ivan Beaver wrote on Mon, 28 December 2009 19:22

Art Welter wrote on Mon, 28 December 2009 21:03 John Halliburton wrote on Mon, 28 December 2009 18:54 Ask if the motors are still working on them.  After that, cones and belts are the next things to check.   They can be rebuilt, but getting motors fixed would be the major hurdle. Finding surplus might be easier. $275 for a working BT7 is a deal. Best regards, John The BT-7 is basically the same horn as the Lab Sub, and it is not difficult to retrofit the chamber for Lab 12 speakers. If I needed subs, I’d be inclined to by the lot, retrofit them with Lab 12s, then sell off the Servodrive parts which are Unobtanium now. Art Welter Are you sure the lab 12's will fit?  The original "drivers" in the servo products were 15" cones-but no magnet structure and the chambers behind the rear of the cones were very close to the rear of the speaker frame. In my SDL5s the bolts that attached the rotary to linear converters actually dug little holes into the wood in the back.   In those cabinets, there was no way you could fit a lab 12.  Maybe there is more room in the BT7's, but I am not inclined to believe there is. Maybe you could fit a very shallow 12", but then the parameters may not be right for the particular horn used in the BT7-but you might get lucky.

The BT7 basket  looks like it is about 6 inches deep, the Lab 12 is 6.44 inches deep.

With one or two “donut” adapters that depth difference could easily be made up.

I once replaced a Servodrive unit with an EVX-150A. I didn’t get to hear the cabinet before the DJs burnt up the Servodrive motor, but the cabinet sounded quite good with the EVX-150A.


Art Welter

[Eric Dodson]

We've got 6 of these Servo Drive BT7's! All working, with spare belts and cones!
In the hopes that this thread will find someone who wants them;
Call Us...!
<http://www.specialeventaudio.com>
Thanks.
Eric Dodson

[John Halliburton]

Art Welter wrote on Mon, 28 December 2009 20:56

Ivan Beaver wrote on Mon, 28 December 2009 19:22 Art Welter wrote on Mon, 28 December 2009 21:03 John Halliburton wrote on Mon, 28 December 2009 18:54 Ask if the motors are still working on them.  After that, cones and belts are the next things to check.   They can be rebuilt, but getting motors fixed would be the major hurdle. Finding surplus might be easier. $275 for a working BT7 is a deal. Best regards, John The BT-7 is basically the same horn as the Lab Sub, and it is not difficult to retrofit the chamber for Lab 12 speakers. If I needed subs, I’d be inclined to by the lot, retrofit them with Lab 12s, then sell off the Servodrive parts which are Unobtanium now. Art Welter Are you sure the lab 12's will fit?  The original "drivers" in the servo products were 15" cones-but no magnet structure and the chambers behind the rear of the cones were very close to the rear of the speaker frame. In my SDL5s the bolts that attached the rotary to linear converters actually dug little holes into the wood in the back.   In those cabinets, there was no way you could fit a lab 12.  Maybe there is more room in the BT7's, but I am not inclined to believe there is. Maybe you could fit a very shallow 12", but then the parameters may not be right for the particular horn used in the BT7-but you might get lucky. The BT7 basket  looks like it is about 6 inches deep, the Lab 12 is 6.44 inches deep. With one or two “donut” adapters that depth difference could easily be made up. I once replaced a Servodrive unit with an EVX-150A. I didn’t get to hear the cabinet before the DJs burnt up the Servodrive motor, but the cabinet sounded quite good with the EVX-150A. Art Welter

LAB 12 drivers would be a much better match than the 150A, and as Art pointed out, very close on the depth matching.  The real work is in altering the 13.75" diameter cutouts on the baffles for the 15" baskets into 11" dia. cutouts for the 12" basket.

At $75/cabinet for the nonworking units in Dallas, I'm sorely tempted myself.

Best regards,

John

[Whit Hutchinson]

Eric Dodson wrote on Tue, 29 December 2009 03:13

We've got 6 of these Servo Drive BT7's! All working, with spare belts and cones! In the hopes that this thread will find someone who wants them; Call Us...! <http://www.specialeventaudio.com> Thanks. Eric Dodson

Eric and others that have had these subs before:


Please enlighten me on why you (or anyone) would be willing to get rid of such a "perfect" sub woofer.   I have always wanted these (albeit wanted 4 (2 per side for my rock bands and DJ gigs))  But were unable to afford them back when this was the only real high powered bass device around.

Now,  I see them for this price,  but thinking on it,  there are still VERY few subs (if any) that can go to 30hz with little power at huge levels.  I understand that they are big cabs and you have to be SUPER careful with them as to not burn them up but it is my understanding that an old school Macrotech 2400 on a pair was sent from god him/herself to run these subs without worry.  I am sure there are many amps since then but I refuse to buy Chinese bullshit anymore so I will stick with my old iron until then.