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Author Topic: As promised! My amp’s tweaks and layout.  (Read 79232 times)
hywelg
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« Reply #30 on: November 01, 2008, 01:03:41 PM »

Hi Hywel,

Here we go: I’m using ultra bright LEDs they use little current and with 2,7k resistors work well. All parts are in Maplin.


Thats brilliant thanks! I would bet many kit builders would prefer this to the 5 core with DIN or XLR connectors, its so much easier to use a simple stereo jack/mic cable arrangement. I think I might have to mod the amp to a Neutrik locking jack socket (the hole is too big now for standard jack socket). I think this should also be posted in the Mods and Tweaks forum and indeed Nik should have it available on his Mods page.
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ampkits
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« Reply #31 on: November 06, 2008, 06:46:28 PM »

Hi

Cool!

Yeah this works great i bet!

Thanks Hywel!

Nik
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hywelg
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« Reply #32 on: November 06, 2008, 11:37:57 PM »

Hi

Cool!

Yeah this works great i bet!

Thanks Hywel!

Nik

Don't thank me Nik, it was Pickmaster who did this layout.!!
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hywelg
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« Reply #33 on: November 08, 2008, 09:27:32 AM »

Hi Dr Ika, I'm just about to convert one of my footswitches to three coonductor wiring, one question.

Wires P and Q, did you just snip them? or indeed just not use them?

Many thanks

Hywel Harris
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Pickmaster
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« Reply #34 on: November 08, 2008, 04:49:57 PM »

Hi Hywel,

No I did not snip them.
Just using 3 conections.

Cheers
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hywelg
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« Reply #35 on: November 08, 2008, 05:08:44 PM »

Great, thanks. That means I can use either footswitch without changing the amp

Many thanks

Hywel Harris
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hywelg
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« Reply #36 on: November 15, 2008, 05:58:21 PM »

Dr Ika, I've just finished making the footswitch mods and it appears I have a problem with the LED's. I used the LED's of the original footswitch which were 12v LED's so I didn't put the resistor in series. Now it appears that they are drawing too much current since if I disconnect them the switching works fine.

So could you tell me the spec of those you used. I'd assume that a 5volt LED with a suitable resistor in series will draw a lot less current than the 12v.

Thanks for your help.

BTW I've just changed the mid cap to 50nF and the treble cap to 1nF with the intention of making it have a little more mid scoop when turning the mid pot down. Not had chance to try it yet, will report back later.

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Pickmaster
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« Reply #37 on: November 15, 2008, 08:25:42 PM »

Hi Hywel,
You can use lo current LEds from maplin
http://www.maplin.co.uk/module.aspx?moduleno=35736

or superbright LEDs
http://www.maplin.co.uk/Search.aspx?menuno=12369

Good luck
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hywelg
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« Reply #38 on: November 16, 2008, 05:18:35 PM »

Thanks for the info, DrIka, I bought both types just to be sure just aswell really as the 'low current' types still drew too much. In fact the 2.7k was borderline for the high power LED's, the PAB relay would trip but the OD wouldn't. I ended up using 12k and now both work fine and the LED are plenty bright enough, in fact the green I'm using is still too bright.

Only problem is the way the switches are wired up, I get the PAB led light up when the PAB is OFF. I seem to recall a discussion a while back that suggested that the switch was wired wrong in the original. I'd think it was just a matter of switching a couple of wires at the relay but I'm not confident enough to know which.

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docmh
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« Reply #39 on: December 11, 2008, 09:08:05 AM »

Dr. Ika,
   Thanks for posting your mods. I still have a few questions.
   I have a new OTS with 100uf filter caps. What does making them 150uf do?
I have a 100K volume pot. What difference does the 250K pot do? I play
humbucking guitars, and love great clean tones. What's the best mod for best clean tones? Sure appreciate your help.
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mcinku
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« Reply #40 on: December 11, 2008, 09:32:49 AM »

Dr. Ika,
   Thanks for posting your mods. I still have a few questions.
   I have a new OTS with 100uf filter caps. What does making them 150uf do?
I have a 100K volume pot. What difference does the 250K pot do? I play
humbucking guitars, and love great clean tones. What's the best mod for best clean tones? Sure appreciate your help.

150uf filters will make your bass tighter at higher volumes.

Quote from erwin_ve about the 100k-250k pot
"Od level pot 100K makes a smoother transition from light overdrive to a heavy overdrive. When the level pot is 250K the transition is less subtle."
...and also with 100K you will have smaller volume jump from clean to OD


something like that
 Wink
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Pickmaster
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« Reply #41 on: December 11, 2008, 03:31:41 PM »

Dr. Ika,
   Thanks for posting your mods. I still have a few questions.
   I have a new OTS with 100uf filter caps. What does making them 150uf do?
I have a 100K volume pot. What difference does the 250K pot do? I play
humbucking guitars, and love great clean tones. What's the best mod for best clean tones? Sure appreciate your help.

Hi Docmh,

Mcinku is correct,
loud bass notes will be tighter with 150uF caps and 100k will work better for drive.

To get great clean sound (especially with LesPaul) permanently solder 68pF cap to the clean volume pot’s terminals and use 100k 3W slop resistor instead of  150k on the first tube. This will give you bigger, more open clean sound.

Good luck
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docmh
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« Reply #42 on: December 11, 2008, 04:41:23 PM »

mcinku, pickmaster, thanks. I'm not sure which 150K resistor to change.
It looks like one is right behind a 0.1uF cap, and the other is linked with a 220K resistor behind a 0.05uFcap. Thanks! 
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Pickmaster
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« Reply #43 on: December 11, 2008, 05:27:26 PM »

One right behind a 0.1uF cap, near lower bord bolt.
marked in GREEN 100k on my layout.
Cheers
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docmh
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« Reply #44 on: December 12, 2008, 06:13:21 AM »

Pickmaster,
    Thanks.
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