Welcome, Guest. Please login or register.
Did you miss your activation email?
December 03, 2024, 05:48:07 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
|-+  Tw Clones
| |-+  Rock It!
| | |-+  Tube bias adjustment		 « previous next »
Pages: [1] Go Down Print
Author Topic: Tube bias adjustment  (Read 13474 times)
MAG-LEV
Newbie
*
Offline Offline

Posts: 1


View Profile
« on: January 28, 2011, 11:17:39 PM »
Could you tell me if the tubes in the Rock It need bias adjustments - if I change tubes or order it without tubes?

Thank You,

DB
Logged
plasticvonaband
Hero Member
*****
Offline Offline

Gender: Male
Posts: 747


Pickin and Grinnin since 1989


View Profile WWW
« Reply #1 on: June 13, 2011, 12:27:09 AM »
AFAIK the Rock-It is Cathode Biased. No adjusting except by adjusting the bias resistors
Logged
Overdrive is like peanut butter. Some like it crunchy, some like it creamy.
Bluesmaster 50 2x12 combo and some guitars.
Jennings
Newbie
*
Offline Offline

Posts: 12


View Profile
« Reply #2 on: January 17, 2012, 12:43:57 PM »
Just like the Vox AC30 (and others)...just take the old EL84s out and pop new EL84s in.  Best to use a set of four matched valves, but basically you won't need to worry about bias adjustments. 
Logged
Big Goon
Newbie
*
Offline Offline

Posts: 3


View Profile
« Reply #3 on: January 28, 2013, 05:45:17 PM »
Be sure to buy a matched quad of power tubes.  Ther is a way to use 2 matched sets putting one matched set as the center 2 and the other matched set as the outer 2 but that is a bit risky and you may have some noise or other problems.  There are a few tricks to figuring out if noise problems are caused by mis-matched tubes.  ther are verbose explinations on the web.
Logged
wyatt
Guest
« Reply #4 on: January 29, 2013, 03:49:30 AM »
Quote from: Big Goon on January 28, 2013, 05:45:17 PM
Be sure to buy a matched quad of power tubes.  Ther is a way to use 2 matched sets putting one matched set as the center 2 and the other matched set as the outer 2 but that is a bit risky and you may have some noise or other problems.  There are a few tricks to figuring out if noise problems are caused by mis-matched tubes.  ther are verbose explinations on the web.

Not when they all share the same cathode resistor, which they do in the Rockit when set to full-power.

If you re-design use a cathode cap/resistor for each pair, you can use two separate matched pairs. If you use seperate cathode cap/resistors for each tube...you can use singles, because they'll each bias individually.
Logged
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.