Welcome, Guest. Please login or register.
Did you miss your activation email?
November 22, 2024, 08:02:10 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
| | |-+  Okay, I'm losing my mind!		 « previous next »
Pages: [1] Go Down Print
Author Topic: Okay, I'm losing my mind!  (Read 5260 times)
dannysgrandpa
Jr. Member
**
Offline Offline

Gender: Male
Posts: 64


Life is good here! God is good...all the time!


View Profile WWW
« on: August 30, 2008, 07:19:03 AM »
The OTS is operational. But, I am having issues with an annoying buzz, or, hum that shows up as soon as I turn the preamp volume to anything above 1. This noise is not effected by the preamp volume once it is audible, but, it is by the master volume. AND  there is a distorted buzzing on low frequency notes in the CLEAN channel. Huh? The annoying buzz all but disappears when I switch to OD and the amp sounds amazing, but, switch back to clean and buzz comes back and the distorted lows show up as well. Angry Sad Huh? Cry   I am also having trouble biasing the power tubes as I am not getting a reading on my DMM. BTW the annoying buzz is effected when I turn the bias pot.    Help...PLEASE!!!      Thank you Embarrassed
Logged
Make a joyful noise...that is smooth, tight and punchy! I believe that God likes tube tone.
Certified IPC Master Trainer: 610G, 620C, J-STD-001G/Space, 7711C/7721C. Hands on soldering trainer, inspection trainer and Electrostatic Discharge instructor.
bluesfendermanblues
Sr. Member
****
Offline Offline

Gender: Male
Posts: 452



View Profile
« Reply #1 on: August 30, 2008, 10:12:40 AM »
Hi there,

It sounds like you could have missed a ground connection somewhere in the preamp section Or have a missing/cold soldering somewhere.

Check the ground connections all the way from the jack input to the master volume. there are around 5 black wires the needs to be soldere to the chassis ground lugs and to the brass bar that runs above the pots.

I missed grounding the brass bar and had a loud hum when engaging the OD

Remember patience and thourough-ness will get you past this amp issue
Logged
Respect for the big guy's work....we're at this part of the forum because of HAD's amps.
dannysgrandpa
Jr. Member
**
Offline Offline

Gender: Male
Posts: 64


Life is good here! God is good...all the time!


View Profile WWW
« Reply #2 on: September 15, 2008, 02:42:58 PM »
You were right on the money! I had an electrical engineer look at the thing and he fixed a couple of very minor issues, but, didn't have a guitar, or, speaker to test it. When I got it home I noticed all the noise. Well, I poked around with a chopstick with the amp on and plugged into a speaker and found that one end of the grid resistor on the first preamp tube looked like it was soldered in, but, the lead was actually moving around in the terminal. I soldered it real good and VOILA!!! no more noise, just clean ringing, rich, fat, awesome tone! Thanks! Bill
Logged
Make a joyful noise...that is smooth, tight and punchy! I believe that God likes tube tone.
Certified IPC Master Trainer: 610G, 620C, J-STD-001G/Space, 7711C/7721C. Hands on soldering trainer, inspection trainer and Electrostatic Discharge instructor.
bluesfendermanblues
Sr. Member
****
Offline Offline

Gender: Male
Posts: 452



View Profile
« Reply #3 on: September 15, 2008, 04:18:50 PM »
Great !! congratulations, It's a nice amp ;-)
Logged
Respect for the big guy's work....we're at this part of the forum because of HAD's amps.
Zenguitarguy
Newbie
*
Offline Offline

Posts: 16


View Profile
« Reply #4 on: January 10, 2009, 12:00:13 AM »
my buzz is in both channels, more noticeable in gain, the amp came assembled but without the ground switch wired. I got the schematic and had my tech try and wire it but there were some confusing inconsistancies, long story short, still buzzing, ground switch does not appear to do anything.

any ideas, please keep in mind I am not electronically savvy and will have to take the amp somewhere

thanks
Logged
dannysgrandpa
Jr. Member
**
Offline Offline

Gender: Male
Posts: 64


Life is good here! God is good...all the time!


View Profile WWW
« Reply #5 on: January 10, 2009, 07:23:02 AM »
First, undo the ground switch if you are in an area with well grounded, 3 wire outlets. Next, have your tech trace the signal from input to output. Try different preamp tubes. There may be a bad solder or two. Also, Nik at ceriatone is very good about answering questions. It's probably something simple, just need to use the process of elimination. Take it slow and thorough. It's worth the wait.
Logged
Make a joyful noise...that is smooth, tight and punchy! I believe that God likes tube tone.
Certified IPC Master Trainer: 610G, 620C, J-STD-001G/Space, 7711C/7721C. Hands on soldering trainer, inspection trainer and Electrostatic Discharge instructor.
Pages: [1] 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.