Therefore you can use the negative binding post at the amplifier back for the ground. However, older models may not have these features. As a result, you can make straightforward and proper connections with the probes of the multimeter. Most modern amplifier models have a handy ground and positive terminal for biasing tubes. At the same time, connect the red lead to the meter’s DC voltage socket and its probe to the positive bias terminal. Next, insert the black lead into the multimeter’s common socket and connect its probe to the amplifier’s ground. For an auto-range multimeter, you only need to set it to DC voltage, but for a non auto-range one, you must set it precisely at DC voltage and 2000 millivolts. To get ready for bias correction, set up your tube biasing meter or multimeter. But only touch these parts when they are cool. Use your tray to keep and organize all of the screws.Īt the same time, you can remove and replace the tubes if you believe they no longer work. Remove the Cover of the Amplifierīefore doing anything with your amp, switch it off and unplug it for at least 30 minutes to discharge any remaining current inside the unit.Īfter that, you can remove all of the screws that hold the exterior case in place.
Without bias probe, you may not be able to use your bias meter. A tray for better organizing the removed screwsĪpart from the bias meter, it would be best if you also get a tube amp bias probe, which serves as the connector of the tubes and metering device.
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