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| | |-+  Boxy PAB? Ineffective tone controls? I've found the design flaw!
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Author Topic: Boxy PAB? Ineffective tone controls? I've found the design flaw!  (Read 19712 times)
Pickmaster
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« Reply #45 on: December 28, 2012, 11:56:21 AM »

So this could be the reason, why I like my amp now really much with the 68k slope. It's really full sounding.

I told ya!  Smiley Cheesy Grin
And I NEVER use JAZZ setting.
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olafvandijk1970
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« Reply #46 on: January 16, 2013, 11:10:34 AM »

Hi there tone lovers,

Once again:
Low slope resistor (not very low though!). Fat sounding Bluesmaster has 47k but there is a  0,02mf after it which cuts down to much bass in comparison to 0,1mf on OTS.
68k slope on OTS is MY PERSONAL favourite which introduces little bit more bass and low mids but most importantly adds natural clean compression to the first tube, so clean gets so called CHIRP and singing quality. Iím a very light touch player and I use very thick pick 3mm Stubby. Compressed clean sound allows me to have less drive on OD trimmer which is kind of clean but fat singing, bloomy, touch sensitive drive tone which does not need PAB to sound great.
In short lower slope resistance and less or no  capacitance on NFB gives me more TWEED tone enhanced in high frequencies with higher capacitor value on the clean volume pot. Personally I always prefer TWEED to Blackface, more correctly tweed fatness with blackface glassy tone added.

Mr. Fabulous is right in case that higher slope resistor gives you more clean, less fat non compressed (more classic blackface) tone and Iím sure many players love this tone but not me. I like rubbery, spongy, fat, wet, syrupy, singing clean and drive tone.

But I totally agree!   Tone is very individual and you have to try to find the best for yourself, tone which makes you play and feel better.

I love my amps. No D-lator in the loop !!! just Digitech RP200

 
 


WOW!!! This OTS sounds amazing!!! IS that just the result of changing out 1 resistor?

I have a stock S&M OTS50 - what would i need to change to make it sound like Your blue one?!
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Pickmaster
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« Reply #47 on: January 16, 2013, 04:09:48 PM »

No Olaf, you have to change much more than that.
As Iíve mentioned to you on You Tube our good friend here on forum and your countryman  ERWIN is a great master of modifications and awesome guitarist as well. Possibly he can help you with the mods Iíve mentioned in recent threads.

Cheers
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Noel
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« Reply #48 on: October 14, 2019, 10:39:14 PM »

Hi
I swapped the 150k to 180k and it is an improvement, thank you. I also changed the resistor on the PAB relay from 10M to 6M6. (Mine was 10m not 22m) This also made a difference.
In an earlier reply someone mentioned changing the bias bypass cap(s?) from 5uf to 2.5uf. Just wondering which one? There appears to be four of them.
Thank you for this.
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