Microsoft stores the information anonymously. No personally identifiable information is submitted to Microsoft. We may use the information collected through cookies to generate statistics about ad performance. Through Microsoft Ads Conversion Tracking, Microsoft and we can track which ads users interact with and which pages they are redirected to after clicking on an ad. The data is stored anonymously by Google. No personally identifiable information is submitted to Google. We may use the information collected through cookies to compile statistics about ad performance. Through Google Ads conversion tracking, Google and we are able to track which ads users interact with and which pages they are redirected to after clicking on an ad. EDIT: Wikipedia says that some older meters use moving coils, etc., while DMMs typically use shunt resistors see below.Our shop uses Google Ads. Either way though, the user is given to understand that it is a current measurement, not a voltage measurement thus one doesn't have to do that nasty math of dividing voltage by one to get current. Plus in the case of my low-end EuroTubes probe that behaved so oddly, it was actually my DMM that was reading the current once the socket doohickie was in place so the sensing device would have been in the DMM, whether sense resistor, half-effect sensor, or the somewhat rare tootsie roll sensor. Interesting to hear these terms, but not really getting at the key point - which is, that by whatever means a bias probe of this sort measures current, the process seems to be disruptive to some amps. I will say, though, that in past threads on bias meters on this forum, many users have reported satisfaction with EuroTubes probes. Other than that, I wouldn't recommend the EuroTubes probes, based on both my experience & Lord Valve's warning. The user manual can be found here, but I don't see a description of its internal workings - so as suggests, you might want to ask. I don't know how the TAD BiasMaster works, but if it were me, I would make sure it uses the 1 ohm resistors. So I bought & assembled a Bias Scout probe kit courtesy of TubeDepot the Scout does use the 1 ohm resistors, and it works far better - with my DVM set up to read voltage, I get a stable reading from the probe as soon as the tubes are warmed up. The probe would settle down after maybe 10 minutes, but I didn't trust it. Something of the sort happened when I would use my Eurotube Octal Bias probe (plus my DVM set to read current) on my innocent little Laney Cub 10 amp - it was difficult to get a stable reading, because even after the tubes were warm, the readout on my meter would move up and down across a fairly wide range, as if at random, for many minutes - not quite what I'd call oscillation, since to me "oscillation" means something insanely rapid this was merely a constantly changing value, but even so it was unsettling. This would be fine, except that probes which measure current directly in this fashion can weird readings, including oscillation. My first probe was their low-end model, the "Eurotubes Octal Bias Probe," and it operates by measuring current and evidently the Pro One does as well see this brag quote from the EuroTubes product page: This definitely includes the various probes marketed under the EuroTube brand. Some operate differently: they measure current directly, not voltage, and are proud of it. In fact, all bias probes do not put a 1 ohm resistor in the cathode path. And I am not alone in my mistrust here is Lord Valve, who will give the closing argument for the prosecution - his biasing FAQ can be found at Duncan's Amp Pages at : I did not find this a satisfactory response. I wrote EuroTubes and they denied that customers had ever reported oscillation problems, let alone the slower instability I'd experienced. So I bought & assembled a Bias Scout probe kit courtesy of TubeDepot the Scout does use the 1 ohm resistors, and it works far better - with my DMM set up to read voltage, I get a stable reading from the probe as soon as the tubes are warmed up. Something of the sort happened when I would use my Eurotube Octal Bias probe (plus my DMM set to read current) on my innocent little Laney Cub 10 amp - it was difficult to get a stable reading, because even after the tubes were warm, the readout on my meter would move up and down across a fairly wide range, as if at random, for many minutes - not quite what I'd call oscillation, since to me "oscillation" means something insanely rapid this was merely a constantly changing value, but even so it was unsettling.
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