Ceriatone Forum

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.

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.

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"

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

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??

Is it possible to only bypass Bass and Middle ????   

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

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

That 'on certain days"remark makes you wonder doesn't it. It sounds like these amps are alive  ???

When you put a 8ohm cab on a 4 ohm output tap, the clean PAB isn't boxy anymore.

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.

Yep, change the two 22m resistors for 4,7 m types. This reduces the differece between on PAB and PAB mode.

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.

You can always 'mismatch' a tube amp 100%.

E.g. If your amp has an 4 ohm tap only, you can run it with both a 2 ohm cabinet or an 8 ohm cab.
I've run an old bassman top, which has a 4 ohm tap, for many years. No problem.

PAB is useless as it completely sucks your tone.

Solution is simple. Wind up the ODS to clean solo volume ( v=7 m=5/7 ), and use your guitar's volume control. I always set up my gear with my guitar on "7" to give me more than I need. It will also gets over the problem of the bridge p/u ( Strat/Tele ) being too quiet. So maybe 7 = rhythm 8= neck solo 9 =  bridge solo 10 = loud solo etc ......    If you have a bleed cap on the guitar volume pot remove it as it will change your tone. If you loose your top end on "7" then buy a better guitar lead, maybe Elixir.
Same thing for o/d tones except your guitars volume control also becomes a drive control.   7 = crunchy rhythm 8 = cleanish solo   9 =  o/d solo 10 = very o/d solo.
One knob can do so much and it's 1" from your right hand !

Indeed and agreed!! Well said.