Another T39 build

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CoronaOperator
Posts: 1648
Joined: Wed Mar 25, 2009 7:07 pm
Location: Medicine Hat, Alberta, Canada

Re: Another T39 build

#31 Post by CoronaOperator »

ctmullins wrote:
Also spent some time with my new Behringer XR18. Very cool little box o' magic!
You have a barn for all those auxxen?
:loler:
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#32 Post by ctmullins »

:loler: My first mixer, actually. My first PA, actually! Woo hoo!
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

djtrumptight
Posts: 823
Joined: Tue Dec 15, 2009 6:08 pm
Location: Detroit,Michigan

Re: Another T39 build

#33 Post by djtrumptight »

The circled area's will more than likely be rattles
T39_0023.JPG
T39_0027.JPG
Built:
2 Autotuba's MCM 55 2421
8 T48's 24"wide 3015 LF
2 DR 250's melded Deltalite II 2510
2 DR 250's flat Deltalite II 2510
2 SLA HT systems
1 Table Tuba Dayton DCS 255-4
2 T 39's 20" wide 3012 LF
1 T-18 13" wide MCM 55 2421
2 SLA Pro's

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#34 Post by ctmullins »

Hmm. Hope not, but we'll see. I still haven't fired the first one up yet, although I'm very close. DuraTex is done, and hardware is mounted. While I'm loving the integrated handles at the top, I decided not to cut them at the bottom, as I've read here from others about needing the vertex of the v-plate to be airtight. So instead I put a strap handle on the underside. Its mounting screws go through the mouth braces.

Image

I also put skid rails on the lower backside.

Image

Hope to be able to wire in the jacks and the driver over the next couple of days, and do the leak test!
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

commander_dan
Posts: 461
Joined: Sun Feb 16, 2014 7:19 pm
Location: Perth, Western Australia

Re: Another T39 build

#35 Post by commander_dan »

Looking sharp indeed. Although it may have been prudent to leak test before applying the finish. Hopefully it tests up all good :fingers:
Built:
6 T30 (24", 3012LF)
2 OT12 (MA, 3012HO)
2 T24 (18", 3010LF)

Running:
DCX2496
XTi 2002
XTi 4002
TRAKTOR Z2
TECHNICS 1210 Mk5's

User avatar
LelandCrooks
Posts: 7244
Joined: Thu May 04, 2006 9:36 am
Location: Midwest/Kansas/Speaker Nirvana
Contact:

Re: Another T39 build

#36 Post by LelandCrooks »

Nicely done. If by chance you do have rattles on the braces, a quick and dirty fix is construction screws. You can get them up to 8" long. Drive them through the back into the next panel. Not very pretty, but it works.
If it's too loud, you're even older than me! Like me.
http://www.speakerhardware.com

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#37 Post by ctmullins »

commander_dan wrote:Looking sharp indeed. Although it may have been prudent to leak test before applying the finish. Hopefully it tests up all good :fingers:
Yeah, I was kinda wondering about the order there too. That's how Bill wrote the plans, though, which is part of what made me wonder about it. This cab came out almost perfectly square, with all of the internal panels lining up nicely, and I checked for leaks as I went, using a bright light, so I'm pretty confident it'll be okay. Never done this before, so maybe my confidence is ill-founded, but we'll find out soon!
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

commander_dan
Posts: 461
Joined: Sun Feb 16, 2014 7:19 pm
Location: Perth, Western Australia

Re: Another T39 build

#38 Post by commander_dan »

As long as you didn't skimp on the PL you'll be fine :)
Built:
6 T30 (24", 3012LF)
2 OT12 (MA, 3012HO)
2 T24 (18", 3010LF)

Running:
DCX2496
XTi 2002
XTi 4002
TRAKTOR Z2
TECHNICS 1210 Mk5's

himhimself
Posts: 599
Joined: Fri Nov 13, 2015 9:34 pm
Location: Vancouver BC & Bloomington IN

Re: Another T39 build

#39 Post by himhimself »

[quote="djtrumptight"]The circled area's will more than likely be rattles

What are you seeing that indicates rattles are likely in these spots? thanks
2xT30 (20", 3012LF)
2xT30 (21", 3012LF)
4xOtop J-array (Beta12, melded/straight piezos)
Truck Tuba (MCM)
Next up: 2xJack12 or family of table tubas

jimbo7
Posts: 849
Joined: Fri Dec 28, 2012 10:45 am
Location: St. Louis

Re: Another T39 build

#40 Post by jimbo7 »

Sorry to jack your thread, but I got a question that relates braces that have been discussed here.

Whenever I slide a brace into position, a lot of glue gets scraped off onto the edge of the panel. I comeback and lay a bead on each side to make me feel better. Is this an acceptable method to prevent rattles?
BFM builds:
XF212
T24 BP102 24"
2x SLA's 6-5" mids, 9- gt-302's
2x AT 14" MCM 55-2421
TrT 5" MCM 55-2421
AT 18" JBL GTO804
2x OT12 flat array
2x SLA Pro 2-Alpha 6's 2-Goldwoods
2x T39 24" 3012lf
Simplex 10 BP102

commander_dan
Posts: 461
Joined: Sun Feb 16, 2014 7:19 pm
Location: Perth, Western Australia

Re: Another T39 build

#41 Post by commander_dan »

jimbo7 wrote:Sorry to jack your thread, but I got a question that relates braces that have been discussed here.

Whenever I slide a brace into position, a lot of glue gets scraped off onto the edge of the panel. I comeback and lay a bead on each side to make me feel better. Is this an acceptable method to prevent rattles?
Yep. I did it that way without going back with the extra bead and have not 1 rattle or leak after building 8 cabs. As long as there is even a tiny amount of PL in the joint, it'll expand and concrete the joint together. PL is good.
Built:
6 T30 (24", 3012LF)
2 OT12 (MA, 3012HO)
2 T24 (18", 3010LF)

Running:
DCX2496
XTi 2002
XTi 4002
TRAKTOR Z2
TECHNICS 1210 Mk5's

EdwardAlt
Posts: 13
Joined: Sun Jan 24, 2016 4:20 pm

Re: Another T39 build

#42 Post by EdwardAlt »

ctmullins wrote: I also put skid rails on the lower backside.

Image
Those skid rails look nice! I may have to get some for my upcoming build.
T39s in progress (well, planning anyhow)

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#43 Post by ctmullins »

First one is finished! Did the leak test, only problem was a bit of leakage around the driver seal, so I added some gasket tape there. I don't have a proper top to pair it with for auditioning, though. Closest I have is my pair of woofer-only Jacks (bass backline), which only go up to 4K or so. Hooked one up and played a few tracks through them anyway, but not at high volume, out of respect for my family. I liked what I heard, though! T39 sounds big and smooth. :D

Second cab is coming along. Got all of the "fiddly bits" (small braces and flanges surrounding the driver opening) done. Also got the quarter-round under the handles, the backing plate for the jacks, and panels 9 and 10 done. Not real happy with panel 10, it didn't quite line up like it should, but oh well, it's "just" the bottom.

And, I spent the afternoon pre-cutting all of the major panels for four OT12s. :hyper:
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

djtrumptight
Posts: 823
Joined: Tue Dec 15, 2009 6:08 pm
Location: Detroit,Michigan

Re: Another T39 build

#44 Post by djtrumptight »

himhimself wrote:
djtrumptight wrote:The circled area's will more than likely be rattles

What are you seeing that indicates rattles are likely in these spots? thanks
Those braces arent glued all the way to the end.I circled the area's that arent glued.Being near the end of the horn they may not have an effect but with so many unglued area's the chances of rattles increase.
Built:
2 Autotuba's MCM 55 2421
8 T48's 24"wide 3015 LF
2 DR 250's melded Deltalite II 2510
2 DR 250's flat Deltalite II 2510
2 SLA HT systems
1 Table Tuba Dayton DCS 255-4
2 T 39's 20" wide 3012 LF
1 T-18 13" wide MCM 55 2421
2 SLA Pro's

ctmullins
Posts: 195
Joined: Thu May 13, 2010 9:05 am
Location: MS Coast

Re: Another T39 build

#45 Post by ctmullins »

djtrumptight wrote:
Those braces arent glued all the way to the end.I circled the area's that arent glued.Being near the end of the horn they may not have an effect but with so many unglued area's the chances of rattles increase.
I'm glad you pointed that out, DJTT. I did actually go back and smear some PL out to the ends of those braces. Better safe than sorry, right? 8)

It's amazing how much faster the second cab goes. I'm nearly ready to glue on the second side already! :hyper:
-todd

5 and 8 string bass | SansAmp | Crown | 2 x J110
2 x W8 panel-mount
2 x T39 24" 3012LF
4 x OT12 2512 melded (finally done!)

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