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jcsifu
Copper Member
USA
47 Posts |
 Posted - 07/01/2009 : 06:04:47
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So I was just jamming on my newly fixed TS-9 (thanks again Laurie) and decided that I should try and contribute something to the group if I am going to ask for advise and help. I don't really have that much knowledge of pedals right now, but I do possess a stubborn learning streak and need to gather info. Here is a rough draft list of components and there functions that I have gathered. Please if you see anything incorrect or just want to add to the list, feel free to let me know. I am going to do the same thing with other pedals that everyone probably has laying around, and post the lists here for everyone. I think it's cool info to use as a idea starting point for a mod. This list is helping me come up with ideas to inflict upon the 8 DS-1's I have now amassed from e-bay and craigslist.
If this is not ok to list I apologize in advance.
jc
C1 - same value but change electrolytic to metal film for clarity
C2 - raise value to let a little more bass pass through
C3 - coupling capacitor – raise value to let a little more bass pass through ... lower the value, the more the low freqs will be rolled off
C4 - feedback capacitor - changing it to a 100 pF may be able to coax a little more brightness
C5 - another coupling cap
C7 - raised to cut some of the harsh top end of this opamp stage
C8 - raise C8 to 1uF, if you do this, also lower R13 to 1k to increase gain but maintain the same frequency response.
C9 – coupling cap - replace with same value just a better quality metal film cap for clarity
C10 - raise from 0.01uF to 0.056uF (darkens the post-clipping tone via larger capacitor shunt)
C11 - Lowering C12 to 0.047uF and raising C11 to 0.1uf makes the output increase and is not as mid scooped.
C12 - Lowering C12 to 0.047uF and raising C11 to 0.1uf makes the output increase and is not as mid scooped.
C13 – rasing value to allow more bass to pass through
C14 - same value but change electrolytic to metal film for clarity
R6 controls the bias of Q2
R7 controls the gain of Q2 increase = more gain, decrease = a little less gain overall but tighter low-end response
R9 can raise from 22 to 220-ohm (cuts treble boost of Q2 transistor) don't go above about 250 ohms
R11 controls the gain in combination with the distortion knob, R13 and C8.
R13 lowering to 1k, if you do this, also raise C8 to 1ìF to increase gain but maintain the same frequency response.
R14 R14 and C10 form a low pass filter, cutting out high frequencies
R16 affects the mids, lower value = more mids
R17 raised from 6K8 to 15K helps keep more bass in the tone control when turned to the treble side
R15 (2K2) and C11 make a low-pass filter with a corner frequency of 3290 Hz
R17 (6K8) and C12 (0.1uF) make a high-pass filter with a corner frequency of 234 Hz
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Edited by - jcsifu on 07/01/2009 20:15:53 |
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Goran
Double Platinum Member
Sweden
2203 Posts |
Posted - 07/01/2009 : 06:37:05
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Great jcsifu, Thanks  |
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cctsim
Silver Member
United Kingdom
418 Posts |
Posted - 07/01/2009 : 19:22:23
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quote:
R39 Stock is 47k. Lower, maybe a 22k = less gain but still has lots of gain when turned all the way up.
My understanding of R39 is that it limits the input current of the following opamp. Reducing it increases the input current, thus, signal-to-noise ratio goes up.
quote:
R15 (2K2) and C11 make a high-pass filter with a corner frequency of 3290 Hz
R17 (6K8) and C12 (0.1uF) make a low-pass filter with a corner frequency of 234 Hz
I think there is a mix-up here. R15 and C11 form a low-pass filter while R17 and C12 form a high-pass, which is also evident from the values of cut-off frequencies you give.
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jcsifu
Copper Member
USA
47 Posts |
Posted - 07/01/2009 : 20:14:47
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quote:
Originally posted by cctsim
quote:
R39 Stock is 47k. Lower, maybe a 22k = less gain but still has lots of gain when turned all the way up.
My understanding of R39 is that it limits the input current of the following opamp. Reducing it increases the input current, thus, signal-to-noise ratio goes up.
quote:
R15 (2K2) and C11 make a high-pass filter with a corner frequency of 3290 Hz
R17 (6K8) and C12 (0.1uF) make a low-pass filter with a corner frequency of 234 Hz
I think there is a mix-up here. R15 and C11 form a low-pass filter while R17 and C12 form a high-pass, which is also evident from the values of cut-off frequencies you give.
Ok, changed notes on R15/C11 and R17/C12...thanks for the catch.
RE: R39, I'll take this one off the list and try to confirm the noise issue. Thanks for your help! |
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My DS-1 list of what component does what
