Ceriatone Forum

Now that we got those nice lay-outs from J. Zucker and becoming a new standard to most overtone users: How is your internal overdrive trimmer set like?

This little thing can make drastic changes to the overdrive sound.
Clockwise you got a more gainy sound. Counterclockwise a less gainy more punchy sound. What did you do and why?

I think mine's at about 11 o clock. Having it on a pot or something you could tweak without having to pull the chassis would NOT be undesirable...to me anyways. Somebody here did that but that looked a little to involved for me.

In preperation of me getting my amp. Where is that pot?

Hi Steven,

It' s the upstanding trimpot located next to the 4,7 uF electrolytic cap. A 220 k resistor is leading towards it.

Is it visible on this pic?
http://www.ceriatone.com/images/completeAmpsPic/Overtone/DSCF0699B.jpg

or can yo only reach it form the other side (where the board is)?

Hi Steven, it' s inside the amp! (that' s why it's called internal ;D)

lol

you know what I mean. On the tube side or the resistor side?

Pls Steven, Check the Layout as Zucker posted it. You' ll find it.

LOL for you guys with the soldering iros this is a piece of cake. I can't even solder a Guitar cable.
I think I have found somthing with 100K on it. On the picture it looks like a small black circle.
When I getr my amp I'll ask you guys how to operate it.  ::)

I have it about 12 o clock.
Very nice and ballsy tone with my strat and unreal pleasure with my new Les Paul.
 8)

This is so very wrong. You can't say "new Les Paul" without picts.

Steven: Especcially for you; (http://www.e-noize.nl/goodies/overtone_od_trimmer.jpg)

Dank Erwin.
Ik hoop dat het zo ver nooit zal komen maar wellicht kan ik het toch niet laten zelf ook een beetje te tweaken.
Ziet er prachtig uit trouwens. Zelf gebouwd?

That trimmer pot has a *huge* effect on the amp's tone and response.  A quarter turn can be the difference between a very good and fairly bad sounding amp. I suspect some of the people that did not like the tone of the amp when they got it may not have fully explored the power of this trimmer. Ideally it should be re-adjusted whenever other changes are made to the amp.

On my amp the sweet spot is between 9 and 10 o'clock, more like 9:15-9:30. I'd like to see either an access hole on the bottom of the chassis for trimming (of course that would be a significant layout change), or a fine tuning pot on the bottom, like a Fender bias pot, with the "coarse" adjustment set internally and the "fine" set externally. An external pot with the full range of the internal trimmer would be too sensitive IMHO.

OK, here you go...
(http://www.bluegate.nl/Images/BY/BY1.JPG)

Wow.... I'm not jealous...honest!!

 ;D You will be when I tell you my playing doesn't match my gear...  :-[

That's a lie. I have heard you play and there's nothing wrong with it.

Strange looking guitar. Did you get a discount cause the paint went all stripy?  ;D

Last couple of weeks I had my od trimmer on 10'o clock.  But after doing a few gigs with it, I just couldnt get that last little of extra juice when picking real hard. As if there was no difference between picking hard and really hard.

So today I changed it to somewhere between 11 en 12' o clock. And the whole range is dynamic now, including picking really hard is making the extra juice.

I tested with the amp open and very carefully turned the pot until
I found a sweet spot, the amp suddenly changed tone and became
really fat.
So I left the pot where I felt the tone was the best, around 12 o'clock.

Caution if you don't know voltages, don't use this method!

when we say we have it at 10 oclock or what ever, from what angle are we looking at it? i would say mine is at 2 and it sounds awsome, not dynamic in any way though. well, no more than  a marshall.

It is looking from the FET board to the Power tran.
If you turn it you should notice the difference as described in the opening post.

ah, in that case i have it at 10.

Hi, I am also unsure as to which side of the trim pot you are to look at to determine clockwise direction, as the slot is visible from either side. Is it from the right hand side as depicted in Erwin's photo? thanks

so does the trimmer affect the amount of gain, or the characteristics of the OD?

Only the amount of gain.

Same with me, i'm waiting for my overtone, and had no clue where the OD trimmer should be.

Erwin_V thanks for you photo with the drawing. Bedankt

Im wondering if the trim pot can be adjusted when the amp is up and running so I can play and hear changes?
as long as Im careful not to touch anything else I should be ok right?

Yes, you can, but be carefull as you said highly dangerous

Be carefull man!

ok one hand behind my back and the other using a chopstick while levitate in the air.
hehe 8)

I always wanted to try that - please let me in on that trick - what a performance stunt that would be  8)