Adjustable "Fixed" Biasįor adjustable fixed bias amplifiers, the amp should be biased by a tech with experience with this procedure. Cathode Bias amplifiers (also commonly referred to as self-biasing)Įach of these types is unique.Adjustable Fixed Bias amplifiers (adjustment potentiometer to set the "fixed" bias point).Non-Adjustable Fixed Bias amplifiers (no bias adjustment potentiometer).The bias methods of amplifiers fall into three basic categories: Many tube amp owners are unaware of this simple regular service for their amp that will keep it sounding its absolute best. Some amps do this automatically, but many do not - particularly in the world of guitar amps. Just like the idle of your car may need adjusting when a major change is done to the engine, new power tubes need their idle (the "bias") adjusted to make sure the amp sounds as good as possible. Clearance - Bargains - Scratch and Dent.Use your "back" button to return to this page. Or, e-mail us.Ĭlick here for a printable order form. Questions? Call us at 84 from 8 AM until 4 PM, Monday through Friday, USA Central Standard Time. MORE TUBE TESTERS COMING VERY SOON, PLEASE BOOKMARK THIS PAGE!!! The TAD Bias Master Bias Meter is not recommended for those without training in basic electronics, amplifier servicing, or those not qualified or trained to work on electronics. There are dangerous voltages inside of any amplifier, and opening an amp exposes the user to these hazardous voltages. NOTE: This test instrument is only recommended for those who have electrical safety training. Brand New Unit! Calibrated and complete with manufacturer's warranty!.Housed in a compact, handsome and rugged case.Set bias quickly, or match pairs of tubes using your own amp and this meter!. Works in any country of the world since it does not use the AC mains for power.Install easily in your amp, then plug the power tubes into them. Four octal sockets connected by audio grade heavy cable. Lab grade accuracy, current range of the meter is within the suggested range of all amps.Measures true plate current under load in your own amp, the most accurate method to match power tubes.FOUR cabled sockets included, front panel rotary switch to display plate current of each tube! Digital meter display, no voltmeter or digital VOM needed.It is fast, accurate, and easy! Precision manufactured in Germany, with instructions in English and German. No AC mains connection needed so this meter can be used anywhere in the world. You merely switch the rotary switch to select any of up to four tubes under test at the test meter to display the plate current of each tube. Turn on the amp, then check and adjust the bias current balance using the lab grade accurate digital meter display. Can be used with guitar amps or hi-fi amps! You merely install the bias tool sockets into each pair of power tube sockets in your amp (up to four tubes at once), and then install the power tubes into the amp through the bias sockets. 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. Bias King Bias and Matching Twin Meter For SaleīRENT JESSEE RECORDING & SUPPLY, INC.
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