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These allow you to figure for plate dissipation factors. Some biasing tools read plate voltage as well as current draw. You aren't biaisng for ayone except you, irght.so this is imho a perfectly acceptable way to go about finding what you like to hear.and you don't have to pull the chassis and risk shock to do it. Someone else using this method might arrive at a totally different and yet 'correct' setting due to their ear and personal wishes. Thsi is a simple method that worksin the real world and sets things for a particular player. IF you take the biasing point to an extreme cold setting, you will hear sonics that rival solid state amps' sounds.and why waste tubes for that, right? The closer you run the plate dissipation to that redplate zone.the sooner your tubes will wear out. The current draw will be such that the plate disspation will be below the redplate fintiely below 70%. Measure that current draw with your biasing rig and see where you put things. When you find what pleases you themost, you have biased your amp for those tubes and your playing/ear. If you want to experiment with the change in sounds, then bit by bit turn that bias pot toward cooler biasing.and play toassess the sonics. IF hte plates stay dark and the sounds please you, you are done. Play the guitar.again keep your eyes on those plates.
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This is the hottest bias piont at which one should run that amp with those tubes. You will see those tubes' plates return to black quickly. Sitting behind the amp with your eyes glued to those plates in the power tubes, rotate that bias pot toward the 'hot' side of things until you see the plates start to glow red.l Immediately back justoff of that pint. All you need is a screwdriver to adjust that bias pot with, your eyes and your ears.įire the amp up. The technique comesin handy when you are in themiddleof nowhere with no meter or 'biasing' rig and yo uhave to replace power tubes. but gut feeling says I've left out some important stuffĬamplain, you cna try this if you are adventuresome. Would the DRRI knowledgable please share some info on this in simple country boy terms? I hope I've done ok. does such a calculation really have to be done, or can it be guestimated? I've read all the threads I can find on DRRI bias and they always end up being over my head.all the reading has me thinking I need to get a regular multimeter and take readings somewhere else, then calculate and set the bias to 70% of what I come up with. The amp still sounds fine, maybe a little different, possibly brighter. but I have the stock Groove Tubes which happen to be EH so I turned down to around 21 thinking the stock tubes didn't need to be running hot as JJ's. The guy in the video on the JJ site said to set at 25. to my surprise I'm reading 26.somthin' on one tube and 25.somethin' on the other. based on what I've read I expected the bias to be cold from the factory, so I planned to crank it up to around 21. Ordered one of those bias testers from Hong Kong on ebay.