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Author Topic: OTS gets "evil" when I engage PAB  (Read 12666 times)
Franne500
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« on: May 12, 2009, 07:18:16 AM »
Hi all,


Is there a way to mod my OTS so that when I engage the OPAB it won't get so "trebly" ? I realle like the sound - it just needs less treble.
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velcro-fly
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« Reply #1 on: May 12, 2009, 03:12:05 PM »
I may be wrong - but doesnt the PAB bypass the tonestack?  if thats the case your tone knob on the guitar is your best bet.
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Franne500
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« Reply #2 on: May 12, 2009, 04:16:08 PM »
you're right - it bypasses the tone stack - I just thought that there must be a way to tweak the amp sp that it is less "trebly"
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JD0x0
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« Reply #3 on: May 13, 2009, 01:45:45 AM »
possibly only bypass the mids and bass, you'll still get a little treble boost due to the mids. when you add mids it adds highs
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Steven_nl
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« Reply #4 on: May 13, 2009, 07:04:36 AM »
Don't quite understand your last remark
you said it bypasses the bass and mids and later you say when you add mids it adds highs??
« Last Edit: May 13, 2009, 01:54:48 PM by Steven_nl » Logged
Franne500
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« Reply #5 on: May 13, 2009, 10:20:04 AM »
Quote from: JD0x0 on May 13, 2009, 01:45:45 AM
possibly only bypass the mids and bass, you'll still get a little treble boost due to the mids. when you add mids it adds highs

Is it possible to only bypass Bass and Middle Huh??   
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JD0x0
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« Reply #6 on: May 13, 2009, 04:07:47 PM »
Quote from: Steven_nl on May 13, 2009, 07:04:36 AM
Don't quite understand your last remark
you said it bypasses the bass and mids and later you say when you add mids it adds highs??




Listen to any fender, marshall, or dumble tonestack. as you add mids it also raises the highend somewhat. listen to the added brightness you get when you flip the midboost switch

i suggested only bypassing mids and bass(if its even doable) because you will still get a flatter EQ boost which wont sound as trebly
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Steven_nl
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« Reply #7 on: May 13, 2009, 08:40:30 PM »
ah ok. I think my amps sounds very boxy when you hit the PAB switch. 
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JD0x0
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« Reply #8 on: May 14, 2009, 01:25:13 AM »
Quote from: Steven_nl on May 13, 2009, 08:40:30 PM
ah ok. I think my amps sounds very boxy when you hit the PAB switch. 

yeah i get that too, usually a only use it for a jazzy sound on the clean channel. but on certain days it sound pretty good on OD too
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Steven_nl
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« Reply #9 on: May 14, 2009, 07:48:30 AM »
That 'on certain days"remark makes you wonder doesn't it. It sounds like these amps are alive  Huh?
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erwin_ve
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« Reply #10 on: May 14, 2009, 09:39:07 AM »
Quote from: Steven_nl on May 13, 2009, 08:40:30 PM
ah ok. I think my amps sounds very boxy when you hit the PAB switch. 
When you put a 8ohm cab on a 4 ohm output tap, the clean PAB isn't boxy anymore.
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erwin_ve
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« Reply #11 on: May 14, 2009, 09:43:45 AM »
Quote from: Steven_nl on May 14, 2009, 07:48:30 AM
That 'on certain days"remark makes you wonder doesn't it. It sounds like these amps are alive  Huh?
Wall voltages are not consistent: OTS has a voltage sweet spot on the pre amp plates, once you're voltage gets too low on a bad day, the sound gets: dark, boxy, muddy compressing less headroom etc.
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bluesfendermanblues
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« Reply #12 on: May 14, 2009, 10:51:48 AM »
Quote from: Franne500 on May 12, 2009, 07:18:16 AM
Hi all,


Is there a way to mod my OTS so that when I engage the OPAB it won't get so "trebly" ? I realle like the sound - it just needs less treble.



Yep, change the two 22m resistors for 4,7 m types. This reduces the differece between on PAB and PAB mode.
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Steven_nl
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« Reply #13 on: May 14, 2009, 11:33:57 AM »
Quote from: erwin_ve on May 14, 2009, 09:39:07 AM
Quote from: Steven_nl on May 13, 2009, 08:40:30 PM
ah ok. I think my amps sounds very boxy when you hit the PAB switch. 
When you put a 8ohm cab on a 4 ohm output tap, the clean PAB isn't boxy anymore.

Hi Erwin
can that damge anything? I have an 8 Ohm cab with 2 Celestion g12-65 speakers (16 ohm each)
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erwin_ve
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« Reply #14 on: May 14, 2009, 11:44:32 AM »
Quote from: Steven_nl on May 14, 2009, 11:33:57 AM
Quote from: erwin_ve on May 14, 2009, 09:39:07 AM
Quote from: Steven_nl on May 13, 2009, 08:40:30 PM
ah ok. I think my amps sounds very boxy when you hit the PAB switch. 
When you put a 8ohm cab on a 4 ohm output tap, the clean PAB isn't boxy anymore.

Hi Erwin
can that damge anything? I have an 8 Ohm cab with 2 Celestion g12-65 speakers (16 ohm each)

No, as long as your output tap is lower than the Cab's impedance it's fine.
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