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moderneagle
Copper Member
Malaysia
9 Posts |
 Posted - 02/16/2009 : 10:32:57
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hi there all! I'm new here but have been a Boss user since the 80s.
I recently bought an OD-1 with version Rev-E board and the JRC4558DD op-amp. What's the best op-amp to change to? the JRC4558D? I've heard some comments that the Texas Instrument op-amp is even better. Cheers! |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 02/16/2009 : 10:36:42
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Hi moderneagle
Welcome to the forum from Australia.
Regards Dr. Bob |
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moderneagle
Copper Member
Malaysia
9 Posts |
Posted - 02/16/2009 : 10:37:51
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thank you Dr. Bob! I'm from Malaysia!  |
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leonard d rock
Silver Member
Philippines
301 Posts |
Posted - 02/16/2009 : 12:02:01
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hi moderneagle and welcome to the forum.
i think the best way to find out what opamp will suit your guitar, amp, other gear and your ears will be to install a chip adapter and buy a bunch chips and install them one by one. you can play each one for at least a week in various playing situations and find out what you really like. the chip adapter saves you the soldering and desoldering and a burnt pcb. all of my od/ds pedals have a chip adapter. of course the most popular ones are the jrc 4558d/dd but look around here and you'll find lots of input and options.
ldr |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 02/16/2009 : 13:44:12
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Hi moderneagle
Or you could just leave it as it is.
Why modify, devalue, & possibly ruin, a highly collectible & classic pedal.
These fetch quite a high price over here, & are increasing in price every few months.
I have a few Rev-E PCB's & would never touch them, they sound just fine.
Why not just build a clone of the OD-1 & experiment on that pedal?
Or get an SD-1 which is basically an OD-1 with a tone control.
And use that as your modding platform.
Just my two cents worth.
Regards Dr. Bob |
Edited by - Dr. Bob on 02/16/2009 13:47:08 |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/16/2009 : 15:14:33
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Hi moderneagle and welcome!
I'd have to agree with Dr. Bob on this one - probably best to not change it as it will affect the value.
If you are really OK with making mods to it, then I'd reccommend soldering in a "machine" socket to allow changing of the chip with no disruption ot the board.
The 4558 is pin-compatible with almost all other dual op-amps, so give anything a try. I'd say start with a modern 4558D (single "D"). Or maybe a TL072. |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 02/17/2009 : 03:26:12
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| Preserve the vintage!! Make a clone and play around with that.. |
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moderneagle
Copper Member
Malaysia
9 Posts |
Posted - 02/17/2009 : 06:27:07
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 Thanks all for the welcome and also the suggestions!
Alas, I have put in the chip socket before I even posted this thread.. too late now to undo it I guess,  and I do have an SD-1 which was modded by a friend to OD-1 specs (tone control taken out) with caps changed to better quality ones. Tonewise, it's very similar to the OD-1 but with more low end let thru and slightly more gain. My reason for asking the forum is to find out what is the preferred OpAmp for the OD-1? I read in Analogman's blog that he thinks the "good" OD-1's are the ones with the silverscrew and large raytheon chip ( http://www.analogman.com/od1.htm ). Now, I've put in a NOS JRC4558D to replace the JRC4558DD and generally liked the sound better. Will take the your advice and not mess any further with the pedal, yikes! |
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bdhact1
Copper Member
USA
3 Posts |
Posted - 11/24/2009 : 23:23:55
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| I have a socket in mine. The 4558DD is too trebley, The JRC4558D is too flatulent and unexciting, The TI 4558D is better in some pickup settings. The best I have found so far is the TL072. It has some beautiful overtones with some bridge pickup settings and an awesome, Joe Walshy powerchord sound. |
Edited by - bdhact1 on 11/24/2009 23:25:13 |
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Topic |
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OD1 OpAmp Question
