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Biasing
Feb 10, 2007 11:42:55 GMT -7
Post by benttop (Steve) on Feb 10, 2007 11:42:55 GMT -7
Well anyone who knows can answer, so I'll put this in the general section.
I want to put some new power tubes in my 6545 but that means I need to set the bias. I have always added a 1 ohm resistor between ground and the cathode and just leave it there so I can read milliamps directly in millivolts. I noticed the 6545 has pins 8 and 1 tied together - it shouldn't matter if they are both 1 ohm above ground should it?
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Biasing
Feb 10, 2007 12:15:02 GMT -7
Post by John on Feb 10, 2007 12:15:02 GMT -7
That's-a-gonna-be-a Myles answer. Even though I like to tinker, I have no idea. That's why I purchased the Weber bias rite.
Does anyone know if Myles is coming to Cleveland for the party/Evan debut?
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Biasing
Feb 10, 2007 13:10:08 GMT -7
Post by DRZ on Feb 10, 2007 13:10:08 GMT -7
Well anyone who knows can answer, so I'll put this in the general section. I want to put some new power tubes in my 6545 but that means I need to set the bias. I have always added a 1 ohm resistor between ground and the cathode and just leave it there so I can read milliamps directly in millivolts. I noticed the 6545 has pins 8 and 1 tied together - it shouldn't matter if they are both 1 ohm above ground should it? Both will need to to tied together , to the one Ohm then to ground. On a EL-34 pins one and eight are the Suppressor grid and the Cathode, both must be grounded in a grid Bias set-up as the 6545. So use the one Ohm read across it in Milli Volts , and vola do to Ohms Law that equals Currant Draw as well. So set it to 32mV, to start then season to taste so to speak. DR.Z
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Biasing
Feb 10, 2007 14:19:06 GMT -7
Post by benttop (Steve) on Feb 10, 2007 14:19:06 GMT -7
Well anyone who knows can answer, so I'll put this in the general section. I want to put some new power tubes in my 6545 but that means I need to set the bias. I have always added a 1 ohm resistor between ground and the cathode and just leave it there so I can read milliamps directly in millivolts. I noticed the 6545 has pins 8 and 1 tied together - it shouldn't matter if they are both 1 ohm above ground should it? Both will need to to tied together , to the one Ohm then to ground. On a EL-34 pins one and eight are the Suppressor grid and the Cathode, both must be grounded in a grid Bias set-up as the 6545. So use the one Ohm read across it in Milli Volts , and vola do to Ohms Law that equals Currant Draw as well. So set it to 32mV, to start then season to taste so to speak. DR.Z Thanks Mike! That should simplify things here...
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