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Author Topic: Overdrive trimmer  (Read 9433 times)
burst59
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« on: August 31, 2011, 11:08:04 PM »
So I'm thinking of opening up my OTS and dialing in some more overdrive with the trimmer.
Does it adjust clockwise for more overdrive and counter clockwise for less?
Also will it fatten up the sound as you increase the OD?
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« Reply #1 on: September 01, 2011, 04:19:00 AM »
Ah, the simple joy of having a BM with the OD trimmer on the back.

Yes, clockwise for more drive. I find the biggest change is from about 9 oclock to about 12 oclock. I keep mine right about at 11 oclock. After noon you get more compression, but not a lot more gnarliness, if you know what I mean. The combination of your main (left-most) volume control and your Drive knob will have more effect on your overall distortion sound. Of course, YMMV.
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burst59
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« Reply #2 on: September 01, 2011, 05:32:08 AM »
11 o'clock is the stock factory setting right? Mine has a little hole on the back of the amp but I think it should to have a trimmer
there, I would feel weird feeding a screw driver through there.
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T Wilcox
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« Reply #3 on: September 01, 2011, 01:37:30 PM »
DO NOT STICK SCREWDRIVER THROUGH THAT HOLE!!!!!!!!

The more recent OTS's come with Potentiometer ( Knob just like the ones on the front) mounted on rear panel.
The version you have has a small pot mounted directly on preamp bd that requires use of a small tip flathead driver. And obviously you would have amp powered up while tweaking to monitor changes, which will expose you to lethal voltages.
Do you have an amp cradle? You will need someway to prop amp so you can even access the inside with tubes installed and powered up.
Read the manual posted at the ceriatone site for the OTS for the rest of the instructions and SAFETY DISCLAIMER.

If you have any questions after that let us know

Todd
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burst59
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« Reply #4 on: September 02, 2011, 06:46:08 PM »
No I was not going to try an adjust through the hole, I would be blind. I played out last night and the amp
had plenty of overdrive, I was actually backing down the OD as I we were  playing because there was so much OD.
I think I'm just going to leave it alone, it sounds great as it is. The cool thing was that I  was able to use the Glaswerks Matchbox
as kind of a master vollume so I could crank up the master on the amp a bit to fatten up the sound then back down the overall volume with
the send & return. I got allot of compliments on the amp. Now I'm just waiting on the speakers, I picked up a set of 80's G12-65's
for $200.00 of of the Gear Page and they should be here any day. For now I'm using a Green Back and a Alnico Blue in a Bogner Goldfinger
semi open 2x12. It actually sound really good but I think the 65's are better suited for this amp.
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Jack Handy
T Wilcox
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« Reply #5 on: September 02, 2011, 09:22:12 PM »
Cool man

Just wanted to make sure you knew there is no trimmer in that hole, but there are plenty of components to short out Shocked

Agreed whether you use effects or not having a buffered unit in the loop is a must

Glad your diggin the OTS

Todd
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EBMM Steve Morse original
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burst59
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« Reply #6 on: September 02, 2011, 11:16:24 PM »
Thanks so much for your help I really appreciate it. Yeah I really love this amp, the funny thing is I have some of the best amps
made Bogners, vintage Marshall's and I've owned 3 Fuch's and this is the best amp I've ever owned.
It matches up with my playing style really well and I love the overdrive tone it's so clean and responsive to pick attack.
I'm selling off a bunch of amps and will probably get another one maybe an HRM as a backup.
It's funny even though I snagged some vintage 65's I think the Green Back Alnico blue sounds really good.
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Jack Handy
T Wilcox
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« Reply #7 on: September 03, 2011, 02:36:49 AM »
No problem
That is cool to hear that you like it more than the Fuchs. I've never played one but I hear Andy makes some decent amps though. It's hard to beat a straight clone of real Dumble though.
Right now I am diggin the dual amp thing. Been playing either my FM50 or my HRM MK with the 2550. If you still have the Marshalls you should try it. Just using a radial big shot as ABY for now and it works great.  I may get one of the ABY kits BYOC just came out with though since it is transformer isolated and also is good for stereo effects. The Marshall tone sure compliments the Dumble tone or vice versa.

Have fun

Todd
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Ceriatone Ultra Champ ( build #5 )
TW Express clone ( build #4 )
Ceriatone HRM MK2 ( build #3 )
Ceriatone 2550  ( Build #2 )
Ceriatone OTS FM50 Modern Eagle Mod (Build #1)
EBMM Steve Morse original
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burst59
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« Reply #8 on: September 03, 2011, 08:12:27 PM »
I have a bone stock 74 Super Lead 100 and a modded 74 Super Lead and a modded 78 JMP in white tolex
but they are pretty loud so I'm going to do a dual setup with my Bogner Goldfinger, it's 45 watts and can
sound like allot of different amps.
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burst59
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« Reply #9 on: September 04, 2011, 10:22:28 AM »
Ok so I checked the OD trimmer and it was at 9 o'clock. I brought it up to 12 and it sounds much better.
It seamed like I lost a bit of gain when I installed the 65's, nor sure why maybe because I had a 15 watt alnico blue and a 25 watt GB
so they were breaking up earlier, so maybe bringing up the OD evened things out. She screams now. I just found a used Two Rock 1x12
Sig cab so that will much easier to take to gigs, also it's much deeper then the Bogner Goldfinger cab so I will get more low end thump out of it.
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burst59
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« Reply #10 on: September 10, 2011, 12:12:07 AM »
Ok I did a couple gigs with the OD trimmer at 12 O'clock and it was way to mushy and compressed. So I backed it off to 10-11 ish
and it sounds way better. The amp seams to have allot of overdrive anyway. I should have just left it alone.
Now one thing I don't like is it seams like the drive channel is way too bassy without the mid boost engaged.
I almost have to run zero bass unless the mid boost is engaged. is there a mod I can do to clean up the bass response?
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T Wilcox
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« Reply #11 on: September 10, 2011, 01:20:55 AM »
The one mod that comes to mind would to make mid boost come on with OD footswitch and off on clean. Would require adding another relay and some rewiring to make it work although ( add relay tap onto coil wiring of OD/clean relay and then rewire from toggle switch for mid boost to the new relay ). Add the relay bd where the HRM bd would be mounted if you had an HRM.

Todd
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Plexi bass 1986 ( build #6 )
Ceriatone Ultra Champ ( build #5 )
TW Express clone ( build #4 )
Ceriatone HRM MK2 ( build #3 )
Ceriatone 2550  ( Build #2 )
Ceriatone OTS FM50 Modern Eagle Mod (Build #1)
EBMM Steve Morse original
50th anniv American Strat
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