Welcome, Guest. Please login or register.
Did you miss your activation email?
December 22, 2024, 11:46:44 PM
Home Help Search Login Register
News: Ceriatone Forums are up and running!!!
 
Guests please register
Note: If you want to help you can donate to keep the forums alive.



Do you want to advertise on this forum ? Send me a private message.



Amplified Parts
+  Ceriatone Forum
|-+  Ceriatone
| |-+  Overtone
| | |-+  Having trouble w/ Clean Channel of my OTS 50!
« previous next »
Pages: [1] 2 Go Down Print
Author Topic: Having trouble w/ Clean Channel of my OTS 50!  (Read 12694 times)
jads57
Newbie
*
Offline Offline

Posts: 16


View Profile
« on: October 24, 2008, 10:27:33 PM »

Hi, I `m having trouble getting a good clean out of my OTS 50. Even when running the pre low(say 4 and below) and the master at full. I`ve checked out all of the preamp tubes. And I compared it to another OTS 50 at a local store here in St. Paul (Willies Guitars) That one sounded not only louder but extremely clean, even w/ the pre running at 6-7.  I`m running fairly vintage  output humbuckers and mini-hums into the normal channel. Any help would be greatly appreciated, thanks in advance!
Logged
JD0x0
Sr. Member
****
Offline Offline

Gender: Male
Posts: 298


Happy Hour Hero


View Profile
« Reply #1 on: October 25, 2008, 03:56:17 AM »

if you have the master at full your going to get distortion.
Logged

It's true i've lost my marbles and i can't remember where i put them.
hywelg
Hero Member
*****
Offline Offline

Posts: 896


View Profile
« Reply #2 on: October 25, 2008, 08:41:47 AM »

Hi, I `m having trouble getting a good clean out of my OTS 50. Even when running the pre low(say 4 and below) and the master at full. I`ve checked out all of the preamp tubes. And I compared it to another OTS 50 at a local store here in St. Paul (Willies Guitars) That one sounded not only louder but extremely clean, even w/ the pre running at 6-7.  I`m running fairly vintage  output humbuckers and mini-hums into the normal channel. Any help would be greatly appreciated, thanks in advance!

How long have you had it? It will improve enormously when you have 30hours plus run time on the tubes with improved brightness and articulation, but break up will not really be affected. If what you describe as a 'good clean' is zero break up, you should get that without a problem, this is a very clean amp even up to 8 on master (not on O/D obviously!). What happens with pre at 8 and master on 3? What about pre on 3 and master on 8? That should tell you whether it is a pre-amp problem or not.
Logged
bluesfendermanblues
Sr. Member
****
Offline Offline

Gender: Male
Posts: 452



View Profile
« Reply #3 on: October 25, 2008, 10:57:28 AM »

if you have the master at full your going to get distortion.

NOT with a low preamp volume  Shocked
Logged

Respect for the big guy's work....we're at this part of the forum because of HAD's amps.
jads57
Newbie
*
Offline Offline

Posts: 16


View Profile
« Reply #4 on: October 25, 2008, 02:07:59 PM »

   Could you further elaborate on the master distorting at full volume please. I assumed it worked like a Fender type circuit( pre and master volume). Thanks again in advance!
Logged
ampkits
Administrator
Sr. Member
*****
Offline Offline

Posts: 325


View Profile
« Reply #5 on: October 25, 2008, 04:06:39 PM »

Hi

It doesnt work like fender.

For max clean, you set vol relatively high, keeping master low.

The most headroom is like clean at about 2 or 3 o clock, while master at 11 or so.

Thanks!

Nik
Logged
JD0x0
Sr. Member
****
Offline Offline

Gender: Male
Posts: 298


Happy Hour Hero


View Profile
« Reply #6 on: October 25, 2008, 05:44:04 PM »

even with the preamp low your gonna get distortion with the master full. its inevitable, tubes breakup when they're pushed like that
Logged

It's true i've lost my marbles and i can't remember where i put them.
jads57
Newbie
*
Offline Offline

Posts: 16


View Profile
« Reply #7 on: October 25, 2008, 11:08:41 PM »

 Thanks evryone, I` found out the guy who owned it before me never had the pwer tubes biased properly.   
Logged
JD0x0
Sr. Member
****
Offline Offline

Gender: Male
Posts: 298


Happy Hour Hero


View Profile
« Reply #8 on: October 26, 2008, 12:14:10 AM »

Thanks evryone, I` found out the guy who owned it before me never had the pwer tubes biased properly.   

My OTS is biased from the factory with standard JJ tubes. and the clean volume is at about 4 but if i crank the Master up to 10 it gets really dirty
Logged

It's true i've lost my marbles and i can't remember where i put them.
jads57
Newbie
*
Offline Offline

Posts: 16


View Profile
« Reply #9 on: October 26, 2008, 08:38:09 PM »

Thanks for all of the info everyone! I ended up putting a spare set of Mesa Boogie 6L6GC(STR-440`s) in the amp and biased to about 23mv.  I also took the advice of running the master lower and the pre at around 7. Sound way better!   The only thing I`m wondering is that on my master volume there isn`t much range. Once I get past 3-4 it doesn`t increase in volume a whole lot until around 9-10. Does anyone else have this same problem?
Logged
JD0x0
Sr. Member
****
Offline Offline

Gender: Male
Posts: 298


Happy Hour Hero


View Profile
« Reply #10 on: October 27, 2008, 03:41:19 AM »

Thanks for all of the info everyone! I ended up putting a spare set of Mesa Boogie 6L6GC(STR-440`s) in the amp and biased to about 23mv.  I also took the advice of running the master lower and the pre at around 7. Sound way better!   The only thing I`m wondering is that on my master volume there isn`t much range. Once I get past 3-4 it doesn`t increase in volume a whole lot until around 9-10. Does anyone else have this same problem?

i get that with all my tube amps. after 3 you just get more breakup on the powertubes
Logged

It's true i've lost my marbles and i can't remember where i put them.
jads57
Newbie
*
Offline Offline

Posts: 16


View Profile
« Reply #11 on: October 27, 2008, 02:03:04 PM »

    I`ve never experienced that w/ other master volume circuits. Why does it act that way w/ this particular amp? Thanks again!
Logged
bluesfendermanblues
Sr. Member
****
Offline Offline

Gender: Male
Posts: 452



View Profile
« Reply #12 on: October 27, 2008, 04:04:04 PM »

    I`ve never experienced that w/ other master volume circuits. Why does it act that way w/ this particular amp? Thanks again!

This is due to the fact, that the fender preamp/tonecontrol circuit puts out much less volts that a Dumble preamp.
In a typical fender (blackface) preamp circuit with a 10k mid pot or 6,8k fixed resistor, there is much more signal dampening, than in a Dumble-style preamp.

A dumble preamp/tone circuit has a 250k mid pot and puts out 10-20 dB more signal to the poweramp. Its ALMOST like haveing a fender pre with the middle pot up full AND the preamp gain at full power.

There you have it !! ;-)
Logged

Respect for the big guy's work....we're at this part of the forum because of HAD's amps.
jads57
Newbie
*
Offline Offline

Posts: 16


View Profile
« Reply #13 on: October 27, 2008, 07:27:02 PM »

  Thanks for the info. But  Ijust got back for trying another( newer) Overtone Special 50 and the amp stayed totally clean when either running the pre low 2-4 or 6-8 and the master low or full volume. I`m wondering if this amp has had the J. Zucker mods.
Logged
hywelg
Hero Member
*****
Offline Offline

Posts: 896


View Profile
« Reply #14 on: October 27, 2008, 07:46:13 PM »

I don't think the JZ mods will have a great effect on the amount of break up, it didn't with mine when I converted it. One thing that will is the valve type in V1 for the clean channel and V2 for the OD channel. If you want less drive try a 5751 or Ay7 in V2. Also a 5751 in V1 will lower the overall gain for both channels.

PAB ON will drive the clean into break up a lot earlier. Make sure you have it turned off, the switches are counter intuitive (pedal postion is OFF)!. You'll know its ON if the tone controls have no effect.
Logged
Pages: [1] 2 Go Up Print 
« previous next »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.12 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!

CeriaTone Forum is not afiliated with Ceriatone Amplifications. The CeriaTone and name, logo and related trademarks and service marks, owned by CeriaTone. , are registered and/or used in the U.S. and many foreign countries. All other trademarks, service marks, and trade names referenced in this site are the property of their respective owners.