Weber Bias Rite

[LP Freak]

I use a bias rite. Mine is almost a decade old and has been used extensively...at least 100 times. Never failed.

That said, the eurotubes one can be used while playing so you can tweak and know exactly what mA you like the best.

Maybe not supposed to, but I play with the Weber unit hooked up.

Definately a no no

 

[JamesPeters]

For those that have the basic probes without the attached meter, what setting do you use on your multimeter? Are you biasing based on volts or amps? The instructions that come with the probes state differently than on their website. Website says mV, paper instructions say mA.

From the website for the BR-AH:

"The cable is terminated into standard red and black banana plugs that are inserted into your voltmeter. Set your voltmeter to read the lowest volts range. Then, the meter will read directly in milliamps. For instance, when your meter reads 35 millivolts (.035 volts), it is indicating 35 milliamps of cathode current."

Measure in mV. There's a 1 ohm resistor in there, and the leads are attached to either end. So it's meant to read voltage, not current. But the number in mV will be the same as the current in mA going through the cathode. That's what it means.

 

[JamesPeters]

Who has used one ?

I own an older one, used it for ~15 years occasionally (when biasing amps other than my own, since mine have test points on them).

The only problem it had (the new ones apparently don't where the wire harnesses enter the tube socket thingies made of copper, it didn't have strain reliefs, so the outer jacket for the wire harness broke (exposing the wires within). The inner wires have their own insulation, and the outer insulation that remains in the holes (since it's glued there) acts as a strain relief for that. So my bias meter still works properly despite that. I see in Weber's photo (that you posted) that now there are rubber gaskets of some kind to act as strain relief for this, so that's good.