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Author Topic: Found this deal for you Texas guys  (Read 12171 times)

Whit Hutchinson

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Found this deal for you Texas guys
« on: December 28, 2009, 05:18:00 pm »

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 Smile
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I have learned in my life:

-Pretty girls don't stay single long
- KF 850s  over SB 1000s per side was designed to be a percussion instrument rather than a "soundpretty thing".

Milt Hathaway

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Re: Found this deal for you Texas guys
« Reply #1 on: December 28, 2009, 05:24:35 pm »

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.
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Whit Hutchinson

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Re: Found this deal for you Texas guys
« Reply #2 on: December 28, 2009, 05:26:46 pm »

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  Very Happy
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I have learned in my life:

-Pretty girls don't stay single long
- KF 850s  over SB 1000s per side was designed to be a percussion instrument rather than a "soundpretty thing".

John Halliburton

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Re: Found this deal for you Texas guys
« Reply #3 on: December 28, 2009, 08:54:49 pm »

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
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Art Welter

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Re: Found this deal for you Texas guys
« Reply #4 on: December 28, 2009, 09:03:52 pm »

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
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Ivan Beaver

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Re: Found this deal for you Texas guys-Are you sure?
« Reply #5 on: December 28, 2009, 09:22:26 pm »

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.
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Art Welter

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Re: Found this deal for you Texas guys-Are you sure?
« Reply #6 on: December 28, 2009, 09:56:32 pm »

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.
index.php/fa/27093/0/

Art Welter
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Eric Dodson

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Re: Found this deal for you Texas guys
« Reply #7 on: December 28, 2009, 10:13:55 pm »

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
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John Halliburton

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Re: Found this deal for you Texas guys-Are you sure?
« Reply #8 on: December 28, 2009, 11:06:20 pm »

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.
index.php/fa/27093/0/

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
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Whit Hutchinson

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Re: Found this deal for you Texas guys
« Reply #9 on: December 29, 2009, 12:23:41 am »

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.
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I have learned in my life:

-Pretty girls don't stay single long
- KF 850s  over SB 1000s per side was designed to be a percussion instrument rather than a "soundpretty thing".

George Aldredge

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Re: Found this deal for you Texas guys
« Reply #10 on: December 29, 2009, 12:34:44 am »

There must not be many fans of these around here, because I have seen them listed a couple of times before. I considered buying one last month just to tinker with. Too many time consuming toys already.............
Very Happy
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Whit Hutchinson

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Re: Found this deal for you Texas guys
« Reply #11 on: December 29, 2009, 01:01:11 am »

George,

If you have ever experienced thsese before you would know why I rushed over here to tell you guys about them first.   Here is what I think about them:  

http://srforums.prosoundweb.com/index.php/m/448054/3944/?src h=Servodrive#msg_448054


Again,  that was my first experience with a subwoofer system and thinking "Holy *&*(ing shit that is more bass than I have ever heard"  
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I have learned in my life:

-Pretty girls don't stay single long
- KF 850s  over SB 1000s per side was designed to be a percussion instrument rather than a "soundpretty thing".

Milt Hathaway

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Re: Found this deal for you Texas guys
« Reply #12 on: December 29, 2009, 11:57:19 am »

Whit Hutchinson wrote on Mon, 28 December 2009 23:23


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.



If you are primarily reproducing sine waves, they are great. However, due to the mass of the motor/belt mechanism, their impulse response was really lousy.

They might be really cool with an upgrade to real drivers, though.
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Tim McCulloch

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Re: Found this deal for you Texas guys
« Reply #13 on: December 29, 2009, 12:01:53 pm »

Whit-

The ServoDrives were The Thing when they came out, and still outperform many so-called "subs."

Twenty years later, though, there are conventional speakers that equal or exceed them and don't have the problems with parts sourcing.  The servo motor is no longer in production, the belts are hard to find, and the cones... I'm not sure.

It's a great piece of history, but gives a buyer no expansion path with sketchy parts availability.

Have fun, good luck.

Tim Mc
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John Halliburton

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Re: Found this deal for you Texas guys
« Reply #14 on: December 29, 2009, 02:22:05 pm »

Milt Hathaway wrote on Tue, 29 December 2009 10:57


If you are primarily reproducing sine waves, they are great. However, due to the mass of the motor/belt mechanism, their impulse response was really lousy.

They might be really cool with an upgrade to real drivers, though.


Milt,

After running QA TEF sweeps on a few hundred Servodrive subwoofer products, I am afraid I have to disagree on the impulse response statement.  They are quite good at it actually, and Tom also did plenty of head to head comparisons in the shop at the time with other competing products.

They still produce some of the best percussion instrument reproduction in the frequency range I've ever heard-and I still have my pair of Contrabass subs as reference.

I do agree however, that refitting the Basstech 7 cabinets for sale in Dallas with "proper" drivers is definitely a workable project.

Best regards,

John
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Ivan Beaver

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Re: Found this deal for you Texas guys
« Reply #15 on: December 29, 2009, 02:50:04 pm »

John Halliburton wrote on Tue, 29 December 2009 14:22

Milt Hathaway wrote on Tue, 29 December 2009 10:57


If you are primarily reproducing sine waves, they are great. However, due to the mass of the motor/belt mechanism, their impulse response was really lousy.

They might be really cool with an upgrade to real drivers, though.


Milt,

After running QA TEF sweeps on a few hundred Servodrive subwoofer products, I am afraid I have to disagree on the impulse response statement.  They are quite good at it actually, and Tom also did plenty of head to head comparisons in the shop at the time with other competing products.

They still produce some of the best percussion instrument reproduction in the frequency range I've ever heard-and I still have my pair of Contrabass subs as reference.

I do agree however, that refitting the Basstech 7 cabinets for sale in Dallas with "proper" drivers is definitely a workable project.

Best regards,

John

Back in the day (late 80's) I got the same comments about my SDL5's.  People didn't like them because they were "slow", "sluggish", and so forth.

And I would agree-as compared to my 2x15" scoops, 2x18" ported cabinets.

It took me a little bit to zero in on why.  It was the time delay inside the cabinet.  Nowadays pretty common knowlege-but things were "different" back then.

I got an audio logic delay unit for the mains.  Noisy-bad HF-not much resolution (5ms intervals), there was not much else (that I could afford) available at the time.  The internal delay was around 11ms (I think) so I used 10ms as the delay. Oh how times have changed Very Happy

It did the job and the sound was much tighter and "faster".

Once again-it was not the cabinet (tool) but how it was used that made the difference.

But I still tore them up ALL the time.  I probably spent 3 times teh cost of the cabinets in repairs trying to keep them running.

It was a rare show (OK maybe 25%) that they would make it to the end of the show without damage. Mad

But then Tom changed the design and the parts were made to spec and the problems I had pretty much went away.  Oh how I wish I had the BT7's instead.

Oh well.  Days gone past.
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Tim Padrick

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Re: Found this deal for you Texas guys
« Reply #16 on: December 31, 2009, 08:29:10 am »

Milt Hathaway wrote on Tue, 29 December 2009 10:57


If you are primarily reproducing sine waves, they are great. However, due to the mass of the motor/belt mechanism, their impulse response was really lousy.


Low frequencies don't have an impulse.  If they did, they'd be high frequencies.


If the LAB12 drivers do not fit, mount them backwards.  If the magnets hit, they could be spaced back from the baffle.  This would be a heck of a bargain if they performed properly.

Gene Hardage

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Re: Found this deal for you Texas guys
« Reply #17 on: December 31, 2009, 12:01:00 pm »

I knew I should have brought my camera when we went to the King Mango Strut Parade in Coconut Grove earlier this week.  The announcer at the corner where the parade turns had a PA set up with several ServoDrive cabs.  Interesting stuff - too bad they didn't have a chance to do any real damage with them - mostly announcing the next goofy low budget parade participants.
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Eric Dodson

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Re: Found this deal for you Texas guys
« Reply #18 on: February 01, 2010, 10:59:05 pm »

Well, it seems that I peaked someone's interest when I mentioned that we had 6 BT7's for sale. (I'm not sure if it was as a result of posting here or not) Mitch sold them to someone in NC last week and I shipped them off today, (2 very large pallets with 3 BT7 per pallet!).
Just for the record; we still have some spare belts, parts and 3 cone's if anyone here knows some who needs them....
Cheers.
Eric Dodson
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Ben Outerbridge

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Re: Found this deal for you Texas guys-Are you sure?
« Reply #19 on: January 31, 2011, 09:45:26 pm »

I own 8 BT7's. The summer I got them I went through a ton of belts. (I was overpowering them) Once I sorted that problem out, the metal rod that the belts spin on got corroded (Bermuda salt spray air) and was chewing through the belts nightly. Anyway, I got irritated and investigated on how to load the cabinet with regular drivers. 6 months later I got over it, cleaned the rods, and ordered some more belts.
I couldn't find any 15 or 12 that could fit where the servocones are attached. If anyone has managed to do so I would love to hear about it.
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Art Welter

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Re: Found this deal for you Texas guys-Are you sure?
« Reply #20 on: February 01, 2011, 10:41:43 am »

Ben Outerbridge wrote on Mon, 31 January 2011 19:45

I own 8 BT7's. The summer I got them I went through a ton of belts. (I was overpowering them) Once I sorted that problem out, the metal rod that the belts spin on got corroded (Bermuda salt spray air) and was chewing through the belts nightly. Anyway, I got irritated and investigated on how to load the cabinet with regular drivers. 6 months later I got over it, cleaned the rods, and ordered some more belts.
I couldn't find any 15 or 12 that could fit where the servocones are attached. If anyone has managed to do so I would love to hear about it.

Earlier in this thread I explained how to do it.
The servodrive I replaced was not in a BT7, but it appears a pair of Lab 12s should fit, but will require some woodwork.
If you take some pictures of your drive unit with dimensions I could be more specific.

Art Welter
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Mitch Grant

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I have 3 new cones and 4 new belt kits for Servodrives!
« Reply #21 on: February 08, 2011, 05:23:57 pm »

....and they are for sale. Make me a reasonable offer.

email me at:
mgrant@specialeventaudio.com

Thanks!
Mitch
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