![]() This unit is remarkably quick and easy to use. It has a fully digital display for ease of reading and matching up to four tubes at once, plus FOUR rugged cables with the test sockets attached. It is the top of the TAD bias meter line, the Bias Master, with no less than four octal test sockets. This is a brand new currently manufactured unit, not used or refurbished, and we have many of these in stock. As power tubes age, the bias should periodically be rechecked and adjusted as needed, or the tubes replaced if they have drifted out of tolerance. Any time you replace power audio tubes the bias of your amp should be checked and/or adjusted. ![]() This very cool FOUR socket test meter lets you regain control over your amp's sonic output. The TAD Bias Master Quad Bias and Matching Meter Hopefully on this webpage I can present good vintage tube testers at reasonable prices, away from the frenzy of the online auctionplace. Some of these sell prices of certain brands and models are grossly inflated. The prices have been steadily on the rise, especially with the frenzied buying of certain vintage testers on eBay and other online auction sites. Tube testers have been out of production since the late 1970s, and supplies are only fair at this time. You can take a more active role in "tube rolling" as you can match your own pairs, and keep tabs on the tubes you are currently using and know well in advance of when replacement time is near. Anyone who has a sizeable investment in vacuum tubes or vacuum tube hi-fi equipment owes it to themselves to have a good tube tester on hand to periodically check the tubes they are using. I have some vintage vacuum tube testers for sale, and are listed here on this page. Covid-19 (Coronavirus) Update: Customer safety and and changes to service.Bias King Bias and Matching Twin Meter For SaleīRENT JESSEE RECORDING & SUPPLY, INC.Mains voltage in the UK and the EU – and what it means for guitar amps.Lead Free Solder in guitar amps and the audio industry.Philips MyLiving Fremont LED light repair.Behringer XR18 repair (digital mixer repair).Roland RH-1 RH1 power supply for Roland JV2080 repair.Please get in touch, the cost of valve amp bias is £37 and includes testing of all valves on a valve tester. My amp needs biasing and I don’t like maths! Biasing by ear or sight (or smell!!) could reduce valve life or damage your amp. I would recommend against these techniques and advocate either biasing to a value specified in manufacturers guidelines or to a value calculated to give sensible dissipation in the power tubes. I’ve heard of people turning the valves up till they ‘red plate’ and then just backing off a bit. Many people have their own ways of biasing an amp. I’ve got a fixed bias amp, but I put new valves in and turned the amp on. The voltages (often 300-700VDC) and currents involved can kill you easily. Valve amp bias must be done on a live amp – operating on a live valve amp is extremely dangerous if you don’t know what you’re doing. If your amp doesn’t have external bias pots then I would strongly recommend against doing your own biasing. The values change from amplifier to amplifier. If you know how to use a multimeter you can place one across these pins and adjust the preset potentiometers to give the correct reading (given by manufacturer). some modern marshalls) provide a bias port on the back of the amp. You don’t need to bias if you buy Boogie valves for a Boogie amp. Boogie get a lot of stick for this on ‘the forums’, but I’d say their reasoning is sound. This is because during design they have permanently set the bias current for optimum performance with own brand tubes. Mesa boogie state that you should only use their tubes. ![]() If you change tubes in a cathode biased amp and the tubes red-plate, take the amp to a tech. This includes many designs using EL84s and 6V6s. Often smaller amps (<30W) are cathode biased.
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