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Author Topic: Tube bias adjustment  (Read 13429 times)
MAG-LEV
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« 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,

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plasticvonaband
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« 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
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Jennings
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« 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. 
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Big Goon
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« 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.
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wyatt
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« 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.
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