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1  Ceriatone / Overtone / Re: Finally ( no more flabby od ) on: January 05, 2013, 05:20:12 PM
Which one are the heater wires? The drilled cables? Some pics would be niche  Chair Dance

HI

If you look at the layout, then it's the wires named "f". They start at the two 3.15 V pins on the powertransformator, and then goes to V5 (6L6-tube) pin 2 and 7

Hope this helps

And they are the thick red and black cables, that goes from V5 through V4 - V3 - V2 - V1

Regards

René
2  Ceriatone / Overtone / Re: Finally ( no more flabby od ) on: January 05, 2013, 10:50:21 AM
Hi
Build my OTS back in 2007-2008, and have never been crazy about the OD-channel.
So I have actually used the amps clean, with pedals in front, and got a great sound out.

About two month ago I put my amp up for sale, because I wanted a simpler singled ended amp.
The first person who came by and tried the amp, had the same experience as me. The clean channel sounds amazing, but the OD channel was thin and lacks harmonics. So ended up with him not buying the amp..

Then I sat down and checked out the forum, to check if anybody had experienced the same as me, and then I stumbled over this thread.

Turned on my solder iron, and cleaned up the heatercables (filaments), which where laying down against the chassis. Not the most clean build, and there were some other wires near the heaterwires. Soldered it up as floating wiring.

Turned on the amp, and WOW... OD-channel just came alive. Nice harmonics and a very musical OD sound, with at fantastic touch sensitivite.

If you are having the same problems, I think this is a very good place to troubleshoot. I don't think it matters if the wiring is floating or not, but more important that there is some distance from the heaterwires to the rest of the wires in the amp.

So thanks Riffraff for starting this thread...

Kindly Regards

René
3  Ceriatone / Overtone / Re: Overtone Soundclips on: September 16, 2010, 11:59:05 AM
I am wondering... do EL34's output tubes lessen the gain of an OTS? All the OTS clips w/6L6's I've heard seem to be capable a lot more gain.

Here's a small clip of mine (w/EL34's) where I switch the deep switch on and off. Pre amp volume at 7, midboost on, overdrive level at 8, master at 4, no PAB. I played on a 1993 Gibson Les Paul Standard with Seymour Duncan PAF pickups. Fuchs Verbrator + EHX Memory Man in the loop. Forgot the playing  Wink

http://s37.photobucket.com/albums/e59/Emiel_J/?action=view&current=Vernet.mp4

Maybe it's your internal OD trimmer which is set low... But turn it up a bit and you will get a lot of OD/DIST, don't think the EL34 was anything to do with the amount of overdrive in your amp

Regards
René
4  Ceriatone / Overtone / Re: Increasing (clean) headroom on: September 11, 2009, 09:29:14 AM
thanks guys. i'll check the bias. this amp just gets so much power tube distortion. if i crank the master on the clean channel it gets past vintage marshall territory gain wise.
You may also want to check the internal OD trimmer... From your describsion it sounds like it set way to high

In clean mode?  Lips Sealed

Hehe maybe i should read the whole thread next time... Just read "past vintage marshall territory gain..." my fault... of course the OD-trimmer has no effect on the clean channel... Smiley
5  Ceriatone / Overtone / Re: Increasing (clean) headroom on: September 11, 2009, 07:32:39 AM
thanks guys. i'll check the bias. this amp just gets so much power tube distortion. if i crank the master on the clean channel it gets past vintage marshall territory gain wise.

You may also want to check the internal OD trimmer... From your describsion it sounds like it set way to high

6  Ceriatone / Overtone / Re: I could use a little more help on: September 01, 2009, 07:41:05 PM
I do the power amp In test and recheck my wiring tonight when I get home.

I already checked for continuity from input to V1 pin one and it looks good for both input and FET input. I plugged in a cable and read it from cable to pin one.

If you are testing the FET-input for signal through the amp, then remember to adjust the FET trimmer (on the small board mounted on the side of the chassis). If its turned all the way down, you won't get any signal through the FET input
7  Ceriatone / Overtone / Re: I could use a little more help on: September 01, 2009, 01:35:19 PM
Some of us... Smiley

As Erwin said if he can hear crackle then there must be some output through the poweramp... Voltage readings also look fine at the 6L6 tubes
8  Ceriatone / Overtone / Re: scatzy,harsch on: July 03, 2009, 07:21:45 PM
My overdrive channel still sounds scatzy,harsch, not singing or smooth.
Yes every thing has burned in and yes i have tried several different pre amp tubes
With a little compresion and delay it sounds better,but nothing like the wellknown
clips from marinblues or spm72(witch tone i like),i play a gibson les paul and a ibanez s 530 over a celestion G12T-100 hot 100.
Any sugestions?

Maybe you schould try it through a different speakercabinet... I don't personally know the celestion G12T-100 hot 100, but I do know that the speaker(s) has a great impact on the sound of the amp

René
9  Ceriatone / Overtone / Re: tube recommendations on: June 23, 2009, 05:32:38 PM
I would highly recommend that you spend a couple of bucks on some NOS tubes for V1 + V2

I have installed Tungsram NOS ecc83 in mine. They sound amazing... Have also tried NOS mullard ecc83, in a OTS I built for a friend... They sound extremely good...

Check out ebay for NOS tubes Smiley
10  Ceriatone / Overtone / Re: contents on: April 13, 2009, 02:51:01 PM
When you receive a kit, does it contain items such as
1. BOM or list of parts
2. Instructions

1 Yes
2 No, you need to use the layout drawing


Also, looking at the diagram of the OTS there are two boards on the far left side. I can read some of the values of the caps/resistors, but there are a few that just look black with one stipe. What are those two boards and what are the values of those black one? Am I missing something looking at those?

Those things with black stripes are diodes, but as these boards come ready assembled you don't need to worry what they are!

 


Ahhhh so those boards are rectifier boards? The diodes are being used in place of a recetifier tube which, from what I'm learning is something Dumble did with many (if not most) of his designs.

One more question. Is there supplied wire to make any final connections?

Thank you for your help. I just finished building a beginner amp to help me understand some basics and I'm looking for the next build.

When ordering a kit, you will receive all boards preassembled, and all the extra resistor, capacitors, switches and so on... You will also receive wires, for the whole amp... So depending on which kit you order, the only things missing is tubes and maybe Powertrafos and output trafos ... Look a kit describtion at ceriatone.com Smiley

11  Ceriatone / Overtone / Re: Poll:- Bias settings on: April 03, 2009, 06:36:01 AM
Tube amp doctor 6L6WGC-STR @ 37-38 mA
How are the TADs working in your OTS?

They were a big improvement compared to the Tungsol's I got from Nik, but then again I don't think those Tungsols were a 100 % ok. I just built my second Ceria overtone for a friend, and this amp was equipped with JJ 6L6, and we did a quick comparison, and we both agreed that the TAD's opened the amp up a little more, and there was a more defined bass response..

Both amps were equipped with NOS ECC83 (mullard tubes), and the V1 and V2 preamp tubes makes a big difference in sound compared to the powertubes... So I would start with the preamp tubes
12  Ceriatone / Overtone / Re: Poll:- Bias settings on: April 02, 2009, 11:24:38 AM
Tube amp doctor 6L6WGC-STR @ 37-38 mA
13  Website, Store / General / Re: Hey folks on: March 19, 2009, 09:07:51 PM
Hi

If you check out the layout to the BF vibrochamp, you will see that there are two options on the power transformers primary Smiley (see ceriatone.com for layout)

So you can solder it to be either 120 V or 240 V... And 240 V will be just fine for the 220 voltage you have at your disposal Smiley

Good luck with the amp

Regards

René F
14  Ceriatone / Overtone / Re: Output Transformer on: February 17, 2009, 09:18:50 PM
I agree that there are many things that affect the tone from situation to situation, but I play this amp in a variety of settings and I just felt that there was a lack of note separation and a brittleness that was always there, especially when I was driving the power section.  With great pickups, tubes and varying speaker combinations, adjusting the ratio to my taste as well, I just felt that the tone was not as "pretty" or sweet and chiming as I thought that it should be.  I talked to a couple of different amptechs that I have worked with in the past and they both recommended a output transformer upgrade.  So I did and the problem was solved. I did not mean to upset anyone at Ceriatone by suggesting that the transformers were cheap and crappy, but I do believe that the output trans. in my OTS at least, was at best adequate.  The Mercury Magnetics just simply blew it away, and I was trying to be emphatic.  But mostly  I am just trying to share positive tonal discoveries with you all.  If you want to find a great sound in your amp or any amp for that matter, I suggest looking at the output transformer first.  I know that I will from now on.  It would have saved me a lot of shop time.  Its like taking a highly tuned V-8 engine and only putting a 2 barrel on it instead of dual 4's if you catch my meaning. Ciao for now.

Which Mercury Magnetics output transformer have you installed??? and is your OTS the 50 W edition???

Thx in advance

René
15  Ceriatone / Overtone / Re: Output Transformer on: February 14, 2009, 01:27:27 PM
Hey

Which specific Mercury Magnetics transformer have you used with the OTS (it's the 50 Watt edition right???)?

Thx in advance

René F
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