I bought replacement power tubes for my ASL 845 monoblocks and I'm having a bias problem with one of them. The recommended bias setting is 850ma. The old tubes which I am replacing were at 719ma and 623ma with the bias pot at its minimum setting. The new ones are at 719 (same as the old tube) and 1,020ma (versus 623 for the old one). These tubes came from the Tube Depot, and they do not sell matched pairs of 845's.
Would someone who is more familiar with SET amps than I am tell me whether I got a tube that is far out of spec and should be returned for a replacement, or should I consider changing a resistor value in the amp to move it into the recommended range? The ASL Model AQ-1006 schematic is posted at http://www.tubehifi.com/Circuit/C_106_845.jpg
Would someone who is more familiar with SET amps than I am tell me whether I got a tube that is far out of spec and should be returned for a replacement, or should I consider changing a resistor value in the amp to move it into the recommended range? The ASL Model AQ-1006 schematic is posted at http://www.tubehifi.com/Circuit/C_106_845.jpg