I'm not a technical person but maybe there's an easy solution to my problem
I'm not to thrilled about te sound of my Ceriatone OTS 50 when the PAB is used. It sounds boxy/nasal.
I use one of Erwin_VE fx loops and a cab with 2 Celestion G12-65's.
I have the May 2008 version of the OTS with Ayan, Scott and Jacks updates.
Erwin did install a 30pF cap o the master Volume
Several things to try would be..Lower the 22m meg resistor on the PAB boost board to bleed in more bass in PAB mode.. Use a resistor sub box to find the value if you have one.. The boost might not be as great but will help with the nasal thing.. Another is to simply lift the stack a bit..check out the BM layout on Nicks site I think he calls it the S&M more along the B-Master lift.. Another one I like is lift or take out the GNFB to the PI..You can also use one half of the PAB relay to lift the stack and the other to break or lift the GNFB... This is a good one and can really get some thick rich harmonic content happening un-clamping the amp...This option really lets you taylor the boost to the right amount of lift and tone...Just a few suggestions..
talbany wrote:(SNIP).. Another one I like is lift or take out the GNFB to the PI..You can also use one half of the PAB relay to lift the stack and the other to break or lift the GNFB... This is a good one and can really get some thick rich harmonic content happening un-clamping the amp...This option really lets you taylor the boost to the right amount of lift and tone...Just a few suggestions..
Tony VVT
This is really an interesting one to me. I had already implemented things in my amp such that I was using half of a relay on PAB to go to a separate volume control that added resistance to the MV, so I could get more volume boost out of the PAB for leads. On my amp, it seemed to primarily just add more gain, without much of a volume boost. One of the drawbacks to this is that the amount of PAB volume boost needed depends much on the setting of the MV: low MV settings don't need a lot of added resistance, but high MV settings do. It's proportional to the MV resistance to ground, in other words, but the boost volume is just additive to the MV, not proportional.
Removing GNFB (or changing the resistance of the NFB circuit) would accomplish much the same thing, and might be able to respond more proportionately, yes? I already have a variable resistor on the GNFB in my build, but I don't actually use it much: I found a setting I like and leave it there.
This is really an interesting one to me. I had already implemented things in my amp such that I was using half of a relay on PAB to go to a separate volume control that added resistance to the MV, so I could get more volume boost out of the PAB for leads. On my amp, it seemed to primarily just add more gain, without much of a volume boost. One of the drawbacks to this is that the amount of PAB volume boost needed depends much on the setting of the MV: low MV settings don't need a lot of added resistance, but high MV settings do. It's proportional to the MV resistance to ground, in other words, but the boost volume is just additive to the MV, not proportional.
Removing GNFB (or changing the resistance of the NFB circuit) would accomplish much the same thing, and might be able to respond more proportionately, yes? I already have a variable resistor on the GNFB in my build, but I don't actually use it much: I found a setting I like and leave it there.
G
Back in the day when I was doing mostly R&D.. One of the things that always rubbed me the wrong way was finding a PAB that I actually liked and would want to use more than say once or twice a night.. Having to play everything from dinky clubs to wedding gigs to outdoor shows different type rooms and different types of guitars I had to have to cover the tones I needed to get paid at the end of the night. I found the Dumble method Skyliner break the bass pot method OK for humbucker type PUP's but too shrill for singles.. The lift the stack method I liked for singles since this method lifts everything including bass tones liked better for singles but got a bit woofie with humbuckers..If I was using the lift the stack method with the amp set fairly low it was OK but for me not ideal...After trying all sorts of weird useless things the one I finially settled on was to lift the NFB slightly just enough to give it some edge top end content and sizzle...Then do an adjustiable lift the stack pot to very the amount of lift.. This way you can control the amount of lift at both higher and lower volume level depending on the room..A push pull dual midrange pot would be ideal. pull it set the lift push it in and set the mids..nothing is ever perfect for me but this is the best PAB method I have found..
A guy on another forum suggested that I try the following:
Instead of lifting the entire tone stack, try switching in a 33k-47k resistor with a .001-.005 cap in parallel off the midrange tab to ground. It boosts gain and volume without deactivating the tone controls.
I haven't tried it yet but I definitely don't find the PAB that usable the way it is currently.
Well I was not very fond of the way how PAB sounded with my OTS too... so I tried the BM (tone stack lift) mod.
I like it much better now, I like how my mids are boosted now, very usefull with SC guitars... the only issue I have is, if I max the mid pot, than PAB does nothing.
Here's my OTS layout with all little mods I have...
You do not have the required permissions to view the files attached to this post.
mcinku wrote:Well I was not very fond of the way how PAB sounded with my OTS too... so I tried the BM (tone stack lift) mod.
I like it much better now, I like how my mids are boosted now, very usefull with SC guitars... the only issue I have is, if I max the mid pot, than PAB does nothing.
Here's my OTS layout with all little mods I have...
Well nothing much really,... I just added LNFB switch, deep instead of FET input, 3 way bright switch, I moved pre OD pot to the back, PAB... Like I said nothing much, just a few more tone options in there.
1250]http://home.kpn.nl/s.scholten17/ots.jpg[/img]
You know me, I'm always in for some experimenting 
