- Technical Details
In order to remain sensitive enough to provide accurate reading, some parts are very delicate. DO NOT attempt to play your guitar while the Bias Rite adapters are inserted. Doing so may very well cause the current to exceed acceptable tolerance for some of the components and damage the unit. Remember, you are only using the Bias Rite to adjust the IDLE current, which means the current level when no signal is being put through the amp.
Please Note: The locator pin in the center of the male octal plug is sensitive to breakage from twisting or lateral (sideways) force. It will break or crack and then it will be difficult to locate the proper pin orientation for re-insertion of the adapter head into the socket. An incorrect installation may damage your amp, the Bias Rite, or both. You must take great care in inserting the bias rite head in the socket. The best method is to set the head adapter on the socket and lightly turn the head until you feel it drop into the socket holes. Also keep the head straight up (perpendicular, vertical right angle) from the tube socket, and push straight down. Do not wiggle, twist, or allow it to be inserted at an angle. If you do break a locator pin, it can be repaired using thick gel super glue.
"For the record, I have been pushing and pulling tubes for over 40 years and was aware this could be an issue. When I designed our octal plugs, I had the factory make the wall of the locator pins twice as thick as a typical vintage vacuum tube locator pin." -Ted
We cannot warranty broken locator pins, but we will repair or replace them for $25 a head plus return shipping. See RMA form here.
We feel this is adequate for the amp technician or user who is familiar with tubes and their operation with regards to understanding biasing, plate dissipation, etc. However, we have had a suggestion that our instructions aren't comprehensive enough for allowing a person to use the bias rite properly. The suggestion was to include tube data, expected current readings for various amps and tubes, etc. We, of course, cannot provide that kind of data due to the wide range of applications, plate voltages, cold-to-hot bias preference, etc. Therefore, if you decide to purchase a bias rite product, please familiarize yourself with tubes, maximum power dissipation ratings, how to read plate voltage and calculate plate power dissipation, and the general operation of power output circuits. Also visit the various technical bulletin boards on the internet to get more information on the subject. Weber tests each bias rite product in an amplifier at full operating voltages and currents prior to shipping the product. Weber cannot assume liability for misuse of bias rite products nor the damage that might result from their misuse.
Customer Reviews of BR-4 Bias Rite
Just get one
Just get one
Just received my Weber Bias rite BR-4 after a bit of a wait and immediately put it to use on my Marshall slp to check just how matched (amp tech’s words) the tubes where and happy to say they where pretty close. The BR-4 is definently worth it and if you plan on getting more hands on with your amp then this will make the job that much easier. I bought a few items and they were all packaged well and were delivered to my home in Australia in 10 days so i’m Very happy with service provided and I will definently be making more purchases from Weber. Do your self a favour and check them out