Jack 10 Lite Build

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Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Jack 10 Lite Build

#121 Post by Bruce Weldy »

You probably have a friend or two with a PA. Borrow an amp or even an old powered head. I did my first couple of 3012LF break-ins with an old Peavey XR600.

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

9830Lark
Posts: 106
Joined: Wed Apr 20, 2022 9:36 am
Location: Georgetown, TX

Re: Jack 10 Lite Build

#122 Post by 9830Lark »

Hmm- well the amp head shut off on me during the break-in. I thought it was just heat related - as I realized the laptop was blowing heat right at the amp and we were in the garage. But no, hours later the amp works fine with the headphone out. But, with the speaker out all I hear is a rhythmic click, maybe once per second. I feel awful. It's not an expensive head (TC BAM200), but still. I was being so careful. I'm clueless at this point. I guess I can contact Sweetwater and see what my options are. I've had it for a couple of months.

Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Jack 10 Lite Build

#123 Post by Bruce Weldy »

9830Lark wrote: Mon May 30, 2022 4:42 pm Hmm- well the amp head shut off on me during the break-in. I thought it was just heat related - as I realized the laptop was blowing heat right at the amp and we were in the garage. But no, hours later the amp works fine with the headphone out. But, with the speaker out all I hear is a rhythmic click, maybe once per second. I feel awful. It's not an expensive head (TC BAM200), but still. I was being so careful. I'm clueless at this point. I guess I can contact Sweetwater and see what my options are. I've had it for a couple of months.
I would guess that running a constant signal that long may have been more than it could take and the heat fried the output stage. The headphone output comes after the input stage and doesn't ever see the output - thus you can use the headphones but not the speaker outs.

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

9830Lark
Posts: 106
Joined: Wed Apr 20, 2022 9:36 am
Location: Georgetown, TX

Re: Jack 10 Lite Build

#124 Post by 9830Lark »

Good news, Sweetwater maintained their well-earned reputation for customer service. Lots of negativity on TalkBass re- driver break-in. You know what they say about certain body parts and opinions - everybody has one. I'm not experienced enough to have an opinion, but I believe the amp had a problem. It only lasted one hour and the thermal protection circuit should have shut it down if it was too hot. Plus I was only putting 2 volts out at 30 Hz. I ran the break-in it for maybe 9 more hours using the mini-mixer.

I wonder if the DI out is still good on the amp? Not that it matters, as I'm sending it back. Just a curiosity. I have no means for testing it. It would still have some value as a headphone amp and DI box, if so.

Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Jack 10 Lite Build

#125 Post by Bruce Weldy »

9830Lark wrote: Tue May 31, 2022 12:42 pm Good news, Sweetwater maintained their well-earned reputation for customer service. Lots of negativity on TalkBass re- driver break-in. You know what they say about certain body parts and opinions - everybody has one. I'm not experienced enough to have an opinion, but I believe the amp had a problem. It only lasted one hour and the thermal protection circuit should have shut it down if it was too hot. Plus I was only putting 2 volts out at 30 Hz. I ran the break-in it for maybe 9 more hours using the mini-mixer.

I wonder if the DI out is still good on the amp? Not that it matters, as I'm sending it back. Just a curiosity. I have no means for testing it. It would still have some value as a headphone amp and DI box, if so.
Great to hear. Unfortunately, lots of forums are made up of people who are long on opinions and short on actual knowledge. No, you don't have to break in drivers......however, if you want it sound as good as possible as soon as possible - it matters.

For bedroom playing, it might not be that noticeable - but, you've done a great build to this point - might as well finish it up by the book.

If you ever need help or testing of an amp's direct circuit - bring it down and I'll check it out for you. There's a ton of gear at my house for doing that kind of thing.

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

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Seth
Posts: 2736
Joined: Thu Sep 10, 2009 8:06 pm
Location: Sacramento, California, USA
Contact:

Re: Jack 10 Lite Build

#126 Post by Seth »

Bruce Weldy wrote: Tue May 31, 2022 2:10 pm ...long on opinions and short on actual knowledge...
All hat, no cattle :cowboy:
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Jack 10 Lite Build

#127 Post by Bruce Weldy »

Seth wrote: Tue May 31, 2022 3:00 pm
Bruce Weldy wrote: Tue May 31, 2022 2:10 pm ...long on opinions and short on actual knowledge...
All hat, no cattle
You may turn into a Texan after all...... :cowboy:

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

9830Lark
Posts: 106
Joined: Wed Apr 20, 2022 9:36 am
Location: Georgetown, TX

Re: Jack 10 Lite Build

#128 Post by 9830Lark »

My wife let me cut the damping material (insulated batting) on her cutting table using a rotary cutter. Sweet! Not only is it very easy to get straight cuts, but I can do it inside in the AC. Hot glued it all in place, double layered. The batting was easy to work with.

Installed driver, crossover and speakons. I was going to wait a few more days before handling, but I was concerned that the tech rep at Sweetwater would want to listen to the amp and I didn't want to fumble with loose wires while holding the phone.

No problems with them, new amp is on the way. Threw together a nameplate for the inside on the laser.
damping.JPG
wiringDone.JPG

Bruce Weldy
Posts: 8301
Joined: Fri Nov 27, 2009 11:37 am
Location: New Braunfels, TX

Re: Jack 10 Lite Build

#129 Post by Bruce Weldy »

looking good!

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

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

Re: Jack 10 Lite Build

#130 Post by jimbo7 »

9830Lark wrote: Tue May 31, 2022 4:45 pm Threw together a nameplate for the inside on the laser.
Nice little touch nobody will see/know but you. I sharpied the year and model in all my builds (in case they end up on reverb.com in 50yrs)
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

9830Lark
Posts: 106
Joined: Wed Apr 20, 2022 9:36 am
Location: Georgetown, TX

Re: Jack 10 Lite Build

#131 Post by 9830Lark »

All buttoned up, leak checked, corners installed. Feet are on the way. Replacement amp head on the way, so no sound comments just yet. A bit underwhelming using the headphone out from my phone, but that's likely not a fair test.

A few figures:

Weight - a few ounces short of 20 lbs.

Costs:
Wood $124
Driver $108
Finish $39
Electronics $38
Hardware $25
Plans $15
TOTAL $349

My initial estimate was $270, but I was $50 low on the wood estimate and a bit low other places.

All-in-all, it's been a blast. Thanks for the hand-holding and encouragement.

9830Lark
Posts: 106
Joined: Wed Apr 20, 2022 9:36 am
Location: Georgetown, TX

Re: Jack 10 Lite Build

#132 Post by 9830Lark »

Images....
done2.JPG
done3.JPG
Pleased with the (almost) flat corners. They didn't force me to do a lot of rounding.

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Seth
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Location: Sacramento, California, USA
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Re: Jack 10 Lite Build

#133 Post by Seth »

That came out looking really good. Great job Lark :thumbsup:
9830Lark wrote: Wed Jun 01, 2022 6:22 am ...Replacement amp head on the way
Bill's assessment of the condition you reported was spot on. However, I couldn't find any evidence on the internet indicating that amp having any sort of high pass filter. So, I think you actually may have witnessed the demise of that little wonder in real time... who knows why. It should have no problem doing the driver break-in at 30Hz and should play well down low. Although a couple of the threads I read indicated that the tone knobs in the middle 12 O'clock position aren't exactly flat-flat, unaltered EQ.

Looking forward to your impressions. Enjoy it Lark :thumbsup:
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

howiez
Posts: 382
Joined: Sun Mar 16, 2014 5:23 pm
Location: Fox Valley, Wisconsin

Re: Jack 10 Lite Build

#134 Post by howiez »

Beautiful cab, inside and out!

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Bill Fitzmaurice
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Joined: Tue May 02, 2006 5:59 pm

Re: Jack 10 Lite Build

#135 Post by Bill Fitzmaurice »

Seth wrote: Wed Jun 01, 2022 10:46 am I couldn't find any evidence on the internet indicating that amp having any sort of high pass filter.
High passing and EQ pre-shape are things that almost all bass amps have but, along with almost every other really pertinent spec, no company talks about. Pixie dust sells, engineering details don't. :wall:

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