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Jeff242
Copper Member
United Kingdom
25 Posts |
 Posted - 12/02/2009 : 13:07:50
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Hi, I've got an OD2 Turbo Overdrive that I've had for way too many years and it's always been fine. However when I use my Les Paul, I have to have the level control flat out for it to (only just) match the clean output when the OD2 is off. I normally use it in non-turbo mode but would like the level to be increased in both modes.
Any ideas as to the best way to do a level boost, I can't see an easy way from the schematic short of adding in a post distortion "gain" stage?
Cheers,
Jeff |
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ssanyee
Silver Member
Hungary
288 Posts |
Posted - 12/02/2009 : 14:33:16
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Hi Jeff242,
In my OD-2 case the volume adjustment brigs same volume result between 1-2 o'clock to compare with clear tone.
but pls do not forget that Les Paul can have humbucker pickups with extrahigh output, it can be an explanation for your phenomenon!
Would be interesting if you could try this pedal with single coil guitar, like telecaster or strato.
Feedback about the results!
cheers |
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Jeff242
Copper Member
United Kingdom
25 Posts |
Posted - 12/02/2009 : 15:10:09
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As you say, it's only with the LP I have an issue. The OD2 is absolutely fine with my Strats and Tele.
I think it's more of a perception thing as the LP doesn't have hugely powerful pickups but they are very dynamic. So if I hit a chord clean and then the same with the OD2 on then I have to have level maxxed to match it. I don't have the drive too high either. |
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ssanyee
Silver Member
Hungary
288 Posts |
Posted - 12/02/2009 : 15:31:29
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Hi,
This is the reason exactly what you describe.
Because your LP is giving much higher output level as your Tele or your Strato and because of the distorted signal is compressed enough in all cases, so the relatively highest signal level is coming from LP when the effect is off. And because of the OD-2 itself does not have enough spare volume you need to turn the volume control all the way up to get the same volume level feeling both on/off the effect.
If you want to mod your OD-2 to solve this phenomenon I would have some idea how should approach it!
OD-2 has a quite good sound anyway, it is one of my favourite overdrive pedal!
cheers |
Edited by - ssanyee on 12/02/2009 15:33:54 |
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Jeff242
Copper Member
United Kingdom
25 Posts |
Posted - 12/02/2009 : 15:58:36
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| yes modification is the way forward |
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ssanyee
Silver Member
Hungary
288 Posts |
Posted - 12/02/2009 : 16:20:03
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So in this case please check out this webpage:
http://www.hobby-hour.com/electronics/s/od2-turbo-overdrive.php
What I would do you can read here:
1. In case of 'turbo on' mode change the value of R32 reistor from 560 Ohm to 1.2 kOhm and reduce R39 form 1.8kOhm to 1.2 kOhm
2. In case of 'turbo off' mode my suggestion would be to decrease the value of R48 resistor from 10 kOhm to 1 kOhm and increase the value of C32 capacitor from 0.015uF to 0.047 uF (this value can be higher a bit, like 0.068 uF, perhaps 0.1 uF will be the best choice)
Maybe, when you would change over the torbo on and off mode with these mods above perhaps will be significant volume difference in this mods I have written above (my suggestion is that in turbo on mode will be louder) so in this case should be keep R32 value around 860 Ohm-1 kOhm and paralelly R39 value around 1.5-1.6 kOhm
Feedback about the result!
Hope I could help!
cheers |
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Jeff242
Copper Member
United Kingdom
25 Posts |
Posted - 12/02/2009 : 16:28:08
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I actually already tried this in the passed and as you suggest the level boost was great in turbo mode, but it didn't affect the non-turbo mode which is the mode I normally use, so I reversed it.
I did think about changing R48/49 for the non turbo. |
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ssanyee
Silver Member
Hungary
288 Posts |
Posted - 12/02/2009 : 16:48:49
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I would not touch R49 definitely, becasue it is the main part to adjust the operation point of Q20 transistor.
Rather I would put additional 1-1 diode serially into both D11 and D9-D10 chain.
Opinion?
cheers |
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More level from my OD2
