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zentropa
Gold Member
USA
837 Posts |
 Posted - 05/22/2008 : 08:45:23
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I just helped my friend with some mods on his SD-1 and i realized that we changed a resistor that falls into the SD-1 bleed fix.
i was curious if changing the components that are connection points in the bleed fix will affect the effectiveness of the bleed fix mod or if it should still work as is.
was mainly curious on changing the value of R6 (such as in the 5star or fulltone mods) and how that may affect it. when we reinstalled it in my friend's pedal it seemed to thin out the low end a bit after changing R6 to 2.4k. i'm curious as i plan on doing it on my fulltone modded SD-1 that has a 2.2k resistor at R6 (i'm waiting for more J201's right now) and curious if it will work well or not.
a related question is the 620k resistor change in R2 that i've read keeley uses to reduce the bleed problem on SD-1's (although when i tested it, it reduced it but didn't eliminate the bleed) and if that would affect the bleed fix. i already bugged Laurie about it and he said it probably would, but being the neurotic obsessive compulsive mofo that i am, i'm asking here too. |
Edited by - zentropa on 05/22/2008 08:56:07 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/22/2008 : 09:15:04
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quote:
Originally posted by zentropa
I just helped my friend with some mods on his SD-1 and i realized that we changed a resistor that falls into the SD-1 bleed fix.
i was curious if changing the components that are connection points in the bleed fix will affect the effectiveness of the bleed fix mod or if it should still work as is.
was mainly curious on changing the value of R6 (such as in the 5star or fulltone mods) and how that may affect it. when we reinstalled it in my friend's pedal it seemed to thin out the low end a bit after changing R6 to 2.4k. i'm curious as i plan on doing it on my fulltone modded SD-1 that has a 2.2k resistor at R6 (i'm waiting for more J201's right now) and curious if it will work well or not.
a related question is the 620k resistor change in R2 that i've read keeley uses to reduce the bleed problem on SD-1's (although when i tested it, it reduced it but didn't eliminate the bleed) and if that would affect the bleed fix. i already bugged Laurie about it and he said it probably would, but being the neurotic obsessive compulsive mofo that i am, i'm asking here too.
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 05/23/2008 : 00:35:44
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quote:
Originally posted by zentropa
I just helped my friend with some mods on his SD-1 and i realized that we changed a resistor that falls into the SD-1 bleed fix.
i was curious if changing the components that are connection points in the bleed fix will affect the effectiveness of the bleed fix mod or if it should still work as is.
Should work the same
was mainly curious on changing the value of R6 (such as in the 5star or fulltone mods) and how that may affect it. when we reinstalled it in my friend's pedal it seemed to thin out the low end a bit after changing R6 to 2.4k. i'm curious as i plan on doing it on my fulltone modded SD-1 that has a 2.2k resistor at R6 (i'm waiting for more J201's right now) and curious if it will work well or not.
R6 and C3 form a low pass at 723Hz, the bigger the cap, more bass, and the lower the res, more gain is had.
a related question is the 620k resistor change in R2 that i've read keeley uses to reduce the bleed problem on SD-1's (although when i tested it, it reduced it but didn't eliminate the bleed) and if that would affect the bleed fix. i already bugged Laurie about it and he said it probably would, but being the neurotic obsessive compulsive mofo that i am, i'm asking here too.
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 05/23/2008 : 00:36:44
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quote:
Originally posted by ChristoMephisto
quote:
Originally posted by zentropa
I just helped my friend with some mods on his SD-1 and i realized that we changed a resistor that falls into the SD-1 bleed fix.
i was curious if changing the components that are connection points in the bleed fix will affect the effectiveness of the bleed fix mod or if it should still work as is.
Should work the same
was mainly curious on changing the value of R6 (such as in the 5star or fulltone mods) and how that may affect it. when we reinstalled it in my friend's pedal it seemed to thin out the low end a bit after changing R6 to 2.4k. i'm curious as i plan on doing it on my fulltone modded SD-1 that has a 2.2k resistor at R6 (i'm waiting for more J201's right now) and curious if it will work well or not.
R6 and C3 form a low pass at 723Hz, the bigger the cap, more bass, and the lower the res, more gain is had.
a related question is the 620k resistor change in R2 that i've read keeley uses to reduce the bleed problem on SD-1's (although when i tested it, it reduced it but didn't eliminate the bleed) and if that would affect the bleed fix. i already bugged Laurie about it and he said it probably would, but being the neurotic obsessive compulsive mofo that i am, i'm asking here too.
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zentropa
Gold Member
USA
837 Posts |
Posted - 05/23/2008 : 01:58:26
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thanks a bunch.
any ideas on the R2 swap?
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zentropa
Gold Member
USA
837 Posts |
Posted - 05/29/2008 : 17:16:24
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well,
been tinkering a lot with this.
seems that with the keeley tone mods and the fulldrive ii conversion that the J201 severely trims off the high end (like the top 3-4Khz or so).
Laurie has been helping me with a different bleed fix mod and we're close to getting it by increasing R18, R19 to 10k and C11 to 100uf and attempting to manipulate R2. at 470k there is minor drive bleed but the overall dynamics remain the same. at 1M there is no drive bleed but the mids seem to have been sucked out a bit (or at least it sounds that way on my amp) and pedals after the SD-1 in the chain are noticeably more noisy.
i know all boss pedals color the tone at least somewhat when bypassed due to impedance changes... curious as to whether or not this is within the ordinary realm or if i should go with more experiments at R2.
i only have enough confidence in my soldering to do 1-2 more swaps in R2.
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/29/2008 : 17:24:06
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Hi zentropa
It's great that you & Laurie have been doing all these SD-1 experiments.
It might be time, that you bought a Resistance Substitution Box?
OR at least wire in a pot as a variable resistor.
Maybe just run a couple of wires to the pads for R2, & clip/twist or solder resistors, to the other end, until your happy.
There will be heaps less mechanical & solder related heat stress/damage to the PCB tracks.
Just my 2 cents worth.
Regards & good luck
Dr. Bob |
Edited by - Dr. Bob on 05/29/2008 17:24:39 |
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zentropa
Gold Member
USA
837 Posts |
Posted - 05/29/2008 : 23:21:45
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i need something to make swapping components easier...
i wish there was a local store that had single pin sockets but alas there are none and i'm too impatient to wait for an order from smallbear.
either that or i just need to get better at soldering :P
i think the long run solution for me is to stop being so neurotic about tone.
gonna experiment with the 620k resistor tonight. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/29/2008 : 23:57:59
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quote:
Originally posted by zentropa
i need something to make swapping components easier...
i wish there was a local store that had single pin sockets but alas there are none and i'm too impatient to wait for an order from smallbear.
either that or i just need to get better at soldering :P
i think the long run solution for me is to stop being so neurotic about tone.
gonna experiment with the 620k resistor tonight.
Are you using expensive de-soldering braid and a temperature controlled iron? Makes all the difference... I haven't burned a track since I bought an old weller solding station. |
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zentropa
Gold Member
USA
837 Posts |
Posted - 05/30/2008 : 03:10:13
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Laurie:
i've only used cheap radio shack desoldering braid... which has never worked well for me. i usually use vacuum suckers for desoldering as i find i do better with those. as for a nice soldering station... i figured if i f'd up the pads on 1-2 more pedals i would buy one. as for now it's still cheaper to buy another couple SD-1 or DS-1 than a new soldering iron. my $6.95 radio shack 15-watt is working well enough as long as i don't go overboard.
on a side note...
after like 15 more tweaks today (my R2 pad is 1-2 solders away from peeling off i swapped it out 6 times today)...
the laurie mod SD-1 bleed fix pretty much nailed it.
put a 470k resistor back in R2.
put a 1uf ceramic cap parallel with C11.
95% tone suck/bleed free. only spot i can tell is ~2.5-3Khz range there's a tiny "gap" in the low midrange. a VERY minor increase in "gain" on the clean, but it's only noticeable with really hot humbuckers that struggle for a clean sound.
final mod result:
R18 -> 10k
R19 -> 10k
C11 -> 100uf + 1uf ceramic in parallel
thanks a ton, man, yer the bomb :D
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/30/2008 : 06:26:34
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| You are quite welcome! (you did all the actual work!) |
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zentropa
Gold Member
USA
837 Posts |
Posted - 06/04/2008 : 07:08:32
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a lil testament...
got a few of my pedals up for sale on craigslist right now.
few modded ones and my OD-1.
had a guy come to check out my OD-1 today trying to find something similar to the SD-1 but with less mid boost.
he had a silver screw SD-1 with him to shoot out vs. the OD-1 and was going to trade me the SD-1 + cash for it if he wanted the OD-1. he decided the OD-1 wasn't different enough...
so i busted out the Fulldrive 2 SD-1 w/ the laurie bleed fix.
he messed around with that for like 5 minutes and asked how much i wanted for it... i said $60 and he had the money out in under 2 seconds.
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/04/2008 : 14:15:58
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quote:
Originally posted by zentropa
a lil testament...
i busted out the Fulldrive 2 SD-1 w/ the laurie & Zentropa bleed fix.
he messed around with that for like 5 minutes and asked how much i wanted for it... i said $60 and he had the money out in under 2 seconds.
Sweet!!
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Topic |
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SD-1 bleed fix and mods...
