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If you're a musician, you'll appreciate the sound of a properly biased tube amp. Your wallet will appreciate the longer life you can get from your output tubes. BiasPlug™ is easy to use, and provides a fast and accurate way to get the best sound from of your amp. Matched output tubes and proper bias are the ingredients to quality sound and longer tube life.
BiasPlug™ is inserted between an output tube and the amplifier. It monitors the total current flowing through the tube. Current is read on a digital voltmeter (DVM) and may then be easily adjusted to the required settings, which are provided in data tables in the Pilot's Manual. |
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The BiasPlug™ is made in the USA of the highest quality components available. The octal plug is made from bakelite phenolic resin to provide the highest electrical insulation and heat resistivity. The cable is double-insulated Belden 8443 20-gauge copper for low resistance and high durability. The banana plugs for the meter connection are USA-made high-grade. All connections are hand-soldered, and cables are provided with strain-relief to ensure long life.
Each BiasPlug™ is thoroughly tested by one of our technicians on a guitar amplifier before it is packaged and shipped. All you need is a digital voltmeter! |
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The BiasPlugPlus™ is the latest addition to the BiasPlug™ product line. The BiasPlugPlus™ is made in the USA of the same quality components as the original BiasPlug™, but also contains a switchable option to read the output tubes' plate voltage quickly, safely, and easily. Plate voltage
is a necessary component to calculating proper bias. Once you know the plate voltage for a particular amplifier you can record it and you won't have to take that measurement again ... however, if you work in the industry and set bias on a lot of different amplifiers, the BiasPlugPlus™ is an indispensable addition to your tool box. The BiasPlugPlus™ uses a precision resistor network to divide the actual plate voltage by a factor of 1,000
so that the voltage which appears on your test leads is safe and will read on the 2V scale of your meter. A 450mV reading equates to an actual plate voltage of 450V, for example. |
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BiasPlug™
Complete with detailed Pilot's Manual which gives complete instructions and tells you everything you need to know about amplifier biasing. |
$49.95 |
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BiasPlugPlus™
With the direct-reading Plate Voltage Option. Complete with detailed Pilot's Manual which gives complete instructions and tells you everything you need to know about amplifier biasing. |
$74.95 |
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DVM-850
Perfect companion meter for the BiasPlug™. Measures AC and DC voltage up to 600V, resistance to 2Meg, DC current to 10A, transistor hfe, diode checker, with backlight and hold function. A great all-around digital meter at a great price! |
$26.95 |
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BiasPlug™ Compatibility
BiasPlug™ may be used with any amplifier that provides for adjustable bias and uses 8-pin
power tubes with the cathode connection on pin 8, including:
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EL-34 |
KT-66 |
KT-77 |
KT-88 |
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6CA7 |
6L6 |
6V6 |
5881 |
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6550 |
7027 |
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Note: Some amplifiers offer adjustable bias, and some do not. The BiasPlug™ will properly measure the cathode current on most all amplifiers, even if they do not offer a bias settings (certain Music Man amps are an exception). You may wish to have certain fixed bias amps (such as Mesa Boogie®) modified by a technician to provide for bias adjustment. Vintage blackface Fender® amps from
the 1960's offer true bias adjustment. Silverface Fender®s from the Fender® CBS era offer a bias balance control, which balances the bias between the output tubes, but doesn't really offer full bias adjustment. (This can be changed - see our Fender® Blackface modification kits here). Most Marshall® amps with 8-pin output tubes offered adjustable bias up through the 1990's. The Marshall® TSL and DSL series of amps introduced in the late 90's have adjustable bias, but that bias is set by
using a special procedure rather than by using the BiasPlug. For other brands of amplifiers, refer to the manufacturer's literature and specifications to see if the bias is adjustable. |
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Specifications
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Base:
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USA Made, bakelite phenolic resin |
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Socket:
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Heavy-duty plastic with long-life contacts |
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Cable:
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Double-insulated Belden 8443 |
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Strain relief, tube base:
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Neoprene heat-shrink boot |
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Length:
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24 inches |
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Connectors:
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Made-in-USA banana plugs. |
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Documentation:
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Spiral-Bound Pilot's Manual |
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Method:
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1 Ohm Cathode Shunt, reads mV/mA |
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Shunt Accuracy:
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1% |
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For our direct site for guitar amplifier electronic parts:
www.amprepairparts.com |
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