Re: Bias Adjustment on the White Oak Audio Design PL14_20 Bo
Lee, I knew you were gonna ask me that. I hand matched the TIS97 input pair. The DC offset on the left channel is 6 mV and on the right channel the DC offset is 9 mV.
The amp has been on with a .7 V 2kHz input for 24 hrs and the bias is still high at 518 mV (left) while the right is 285 mV, pretty steady.
The Rod board is good but the turn-on delay is very fast, probably half a second. He lists some RC combinations to adjust the delay and I am going to play with those. The only drawback I see is that his board cannot handle a supply voltage above 60 VDC. He designed it for normal amps, not our power-hungry PL 400 and 700s. So I had to use a small PS to give the board and relay 40 VDC. It works well, he said to test it use a small resistor on the rail and touch it to the speaker outputs, the relay drops the output jacks to ground immediately.