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biboplar
Copper Member
5 Posts |
 Posted - 02/16/2010 : 13:11:54
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Can somebody say anything regarding the "optimal op-amp discussion" to the above mentioned one in my used Boss SD-1 dated February 1984 (board no. 2291042803)?
Particulary in relation to the well known JRC4558D and RC4558 - what are
the differences compared to the "famous ones"?
Please refer to the attached picture.
Thanks for your opinions.
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Pedal Dan
Silver Member
USA
419 Posts |
Posted - 02/16/2010 : 13:32:53
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Hi Biboplar, welcome to the forum from Phillytown! I think that's a Panasonic low noise Hi Fi op amp. My Ibanez Fat Cat also has a similar, JRC5534. The 4558 series are a little noisier and have less headroom. Some people think that's better for guitar distortion. I always thought SD-1's only had the 4558, interesting!!! Dr. Bob and Laurie may have seen this before. |
Edited by - Pedal Dan on 02/16/2010 13:40:14 |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/16/2010 : 14:17:42
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G'day and welcome!
The 4558 is generally considered "better". One school of thought is that the 4558 handles clipping in a more benign manner.
All the SD-1's I've seen have had the 4558. Do you know if the pedal has been repaired at some point? |
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Pedal Dan
Silver Member
USA
419 Posts |
Posted - 02/16/2010 : 14:24:39
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Sorry, that is Mitsu! How does it sound?... From my experience the 84 and reissue TS9's w/ Toshiba TA75558's sound crystaline on the top end. That is also a Hi Fi op amp and the Tube Screamers so equipped can be used as a mike pre in a pinch! |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 02/16/2010 : 15:25:28
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Hi biboplar
Welcome to the forum from Australia.
That's the first SD-1 I have seen with a 5218 opamp.
I will have to keep more of an eye out, next time someone brings one to the Lab for some R&R.
Regards Dr. Bob  |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 02/17/2010 : 12:18:31
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Welcome biboplar!
A little off topic, but I have put a chip socket in one of my SD-1�s and tried different op-amps. The op-amp have not a huge part in the sound of course, but I really like Burr-Brown OPAxxxx (forgot the right number) and JRC4558D.
Op-amps are cheap, even the Burr-Brown, and it�s a funny way of tailoring the voice of a pedal without too much soldering.
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biboplar
Copper Member
5 Posts |
Posted - 03/03/2010 : 13:43:43
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quote:
Originally posted by Laurie
All the SD-1's I've seen have had the 4558. Do you know if the pedal has been repaired at some point?
Hi Laurie,
as far as I can see, the pedal was not repaired. It seems to be the original chip.
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SD-1 with Mitsubishi 5218 op-amp
