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Author Topic: My OT build  (Read 33367 times)
hywelg
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« on: April 21, 2008, 09:49:47 PM »

Finally finished it yesterday at about 7pm. I reckon about 20 hours in total but since this was only my second amp build I reckon I would be much quicker next time. Much quicker than the 11 week wait for a built version!

Not as neat at the factory built versions but I'm happy with it. Its gone to my amp tech now for testing and powering up, setting the PI balance and biasing. I do hope he does it quickly!



* OTS.jpg (127.64 KB, 800x454 - viewed 926 times.)
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mcinku
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« Reply #1 on: April 22, 2008, 05:52:33 AM »

It looks cool but those black cables,.... I would put it under the board.

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hywelg
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« Reply #2 on: April 22, 2008, 08:13:24 AM »

I did try it that way, but the angle it had to go to get down under the board from the FET trimmer position was a little too extreme for the 2 core shielded that I'd got to use.

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mcinku
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« Reply #3 on: April 22, 2008, 09:27:47 AM »

 Lips Sealed


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fred
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« Reply #4 on: April 22, 2008, 03:00:20 PM »

wow, you have finished already! well done!
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hywelg
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« Reply #5 on: April 22, 2008, 06:23:17 PM »

A fairly intensive effort at the weekend!
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bluegate
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« Reply #6 on: April 22, 2008, 08:39:23 PM »

Congratulations!
It looks like a clean build, so should be no problem for the Tech.
Couldn't see the fillamentwires very well so don't know about that.

Here are mine :


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hywelg
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« Reply #7 on: April 24, 2008, 09:15:48 PM »

Just got it back from my amp tech and had a short play with it. Clean seems to be very dry and lacking 'sparkle' at home volume levels (master 1½ ish) I tried it for a short period at 4 and its much better. My tech biased at 35mA and I'm wondering if the onset of breakup will be earlier if I bias it a little hotter.

I'm going to try my Hotplate in line later (its getting late here now so I'd better wait till tomorrow!) to see if I can get master to 4 at sensible volumes, though thats not what I wanted the amp for, I need it to do the business at rehearsal and gigging volumes. I have been investigating Power Scaling and would be very interested to hear of anyones experiences.

I prefer the OD trimmer set low and the ratio 9 o'clock ish. Though the OD is really nice for a solo lead sound when wound up a little more its not so good for chords then, I think I'll be experimenting with my OD pedal to achieve that and keep the OD channel pretty clean.

The FET input is nearly unuseable with my Ibanez335, it just starts to feedback at any opportunity. Have't had chance to try an acoustic yet as I don't own one.

So far with my 4x10 Jensen P10R cab its sounds warm and not overly bright but that changes as you wind up the master, I need more time with it and to try using the speakers in my Fender Twin Amp (fender 'special' design though I suspect there's very little special about them). I need to borrow a g12-65 cab to see what its like.

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ChrisL
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« Reply #8 on: April 25, 2008, 12:47:57 AM »

Just got it back from my amp tech and had a short play with it. Clean seems to be very dry and lacking 'sparkle' at home volume levels (master 1½ ish)

I prefer the OD trimmer set low and the ratio 9 o'clock ish. Though the OD is really nice for a solo lead sound when wound up a little more its not so good for chords then, I think I'll be experimenting with my OD pedal to achieve that and keep the OD channel pretty clean.

The FET input is nearly unuseable with my Ibanez335, it just starts to feedback at any opportunity. Have't had chance to try an acoustic yet as I don't own one.

So far with my 4x10 Jensen P10R cab its sounds warm and not overly bright but that changes as you wind up the master, I need more time with it and to try using the speakers in my Fender Twin Amp (fender 'special' design though I suspect there's very little special about them). I need to borrow a g12-65 cab to see what its like.



Congrats on the build.  Give it a chance to burn in a bit before doing too much.  Make sure all your voltages are within range.  You can bias a little warmer so try that but watch for redplating. 

Chords?? What are those?  LOL   Dumbles don't do chords, sorry.

Masking tape is the preferred solution to the FET problem.
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fred
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« Reply #9 on: April 25, 2008, 05:28:10 PM »

NO CHORDS! ARRGGGGGGGGHH!!!!
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hywelg
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« Reply #10 on: April 25, 2008, 06:58:56 PM »

Just spent 10 minutes with my strat and the Hotplate, master on 5 preamp vol on 5 and boy does it sing, its just on the verge of breakup on 5, switch to OD and it bites, hit PAB and it takes it up another level. I can't wait to get it to a rehearsal and use it without the Hotplate. I also tried the FET input with the strat, its got Fralin Vintage Hot pups and the FET  cahnnel was much more controllable, not sure its'll be of much use though unless I use A/B switching and I'm not sure that the inputs can be used that way.

Making a start on the headshell on Sunday.
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hywelg
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« Reply #11 on: April 27, 2008, 08:22:59 PM »

Just finished for the day. Headshell cab is assembled. Just need to attach battens for mounting front and rear fascia panels and then I can get it covered. First cab is going to be Fender Black tolex with nickel/chrome fittings. Considering Blonde with black fittings for number two. Then I'll decide which to keep. I really would like to get a brown/cream faceplate to go with cream chicken head knobs, but i guess thats just being obsessive!

I think I might have positioned the chassis about 5mm too far back. I wish I could get a really good photo of a D style head, or if someone could tell me how far back the face plate should be.


* OTS-head.jpg (87.48 KB, 800x600 - viewed 765 times.)
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ChrisL
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« Reply #12 on: April 28, 2008, 02:53:33 AM »

You're on you way.  It looks good but yes the chassis is back a wee bit much.  However, once tolexed it's going to look great.  I like 1.8~2.0 cm depth. 

Like this.   (note... this one doesn't have the control panel cutout)

http://i142.photobucket.com/albums/r107/candhh/Overtone2.jpg
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hywelg
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« Reply #13 on: April 28, 2008, 08:49:21 AM »

I was looking at the Two-Rock and trying to gauge the set back dimension.

http://two-rock.com/photos/cl/cl1.jpg looks like 25mm 'ish

and the D'Lite

http://us.st11.yimg.com/us.st.yimg.com/I/yhst-89931406377916_1998_4061762 which looks nearer to 30-32mm to me.

I think the 18-20mm set back you use will only work without the cutout. My cutout is 20mm deep.

 I was also constrained a little by the fact that I already had birch ply in 268mm width so I placed the OTS equidistant from front and back. Maybe it was a little too wide at 268mm. Its not too late to move it all forward.

Did you make the cabs? What glue did you use for that blonde. The blonde I can get seems very thick and rubbery and whilst I've used both contact adhesive and PVA in the past I'd rather use PVA anyday, but I'm aware that some stuff it won't stick well enough. I think its to do with the cloth backing. Fender Black seems a lot thinner and is fine with PVA.
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ic-racer
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« Reply #14 on: April 28, 2008, 11:38:09 AM »

Cabinet looks nice, though it is styled after a later model Dumble. Here is a collage I put together to show the different chassis and cabinets Dumble used.


« Last Edit: April 28, 2008, 11:41:35 AM by ic-racer » Logged
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