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Post by cujo on Jul 6, 2008 8:19:50 GMT -5
anyone have a step by step to bias the nitro? maybe a couple lil pics where i stick the leads of multi meter.I did the herbert and marshall but they both have the external bias set up.
also do I test ma or mv? and the correct bias for the diff tubes?
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Post by cujo on Jul 7, 2008 22:20:39 GMT -5
no one has an answer for this?
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Post by fastredponycar on Jul 8, 2008 15:16:47 GMT -5
Get a weber bias rite tool that sticks into one of the center 2 power tube sockets and has the little 2 pins that plug into a volt meter, set the volt meter to read milliamps and then turn the tiny little bias pot inside the amp until you reach the recommended bias setting.
of course, crazy as it sounds, I always just use my ears and a little common sense when biasing my amps. I know good and well that the amp probably isn't at an ideal bias at either extreme setting of the little adjustment pot and that typically in the center is the safest so I'll usually start in the center or wherever it's set when I get it, crank the hell out of the amp and have a friend start playing while I slowly tweak the bias pot until I get a good blend of tightness and saturation and stay away from it being too thin sounding or overly compressed or muddy which can happen if you stray too far either direction of the ideal bias setting.
I typically tend to err on the warmer side of biasing but it doesn't have too big of an impact on wearing out power tubes too quickly. I tend to use up to 2 sets a year depending on how often I play.
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Post by cujo on Jul 8, 2008 17:54:04 GMT -5
there is a way of biasing with out that tol by just using a multi meter,thats what id like to know.
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Post by LooseCannon on Jul 8, 2008 18:09:27 GMT -5
Do you play the amp while the bias rite is connected? that's a no-no
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Post by cujo on Jul 17, 2008 16:39:53 GMT -5
I picked up a single tube bias checker from euro tubes for 25 bucks.... checked all 4 tubes with it and found hottest tube and set that at 32...worked great. 25 vs 125 bucks big diff. it plug directly in digital multi meter.
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Post by LooseCannon on Jul 17, 2008 17:08:42 GMT -5
Crabby did you get it with the euro tubes multimeter or did you have one already?
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Post by cujo on Jul 17, 2008 20:35:53 GMT -5
i have a craftsman digital multi meter...
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Post by porkchops on Jul 23, 2008 11:54:37 GMT -5
Go and buy yourself a Weber Bias Rite BR4. Check on ebay cause you'll have to wait if you order direct. With the BR4 you plug in all 4 power tubes at once so don't have to move the sockets around while you are setting the bias. It makes the process much easier especially for a dummy like me. It is a really simple process but you need to have a steady hand and an insulated screw driver or else you may have electricity passed through your body causing great pain or even death.  |
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