Mr. Yamaha
Not so much Yamaha lately...
Small update here. I replaced the single turns with 500 mW multi turns and it's MUCH better. Bias spot on at 40 mV and DC offset spot on at 0 mV. Verry happy.
I went from 60 mV bias to 40 mV and it sounds much better. Less boomy, more seperation between instruments. But I still wonder whether imaging can be improved. The M-2 I had spreads the instruments all across the room, but with the B-2 the instruments are very near the speakers.
I also changed the LED's to amber and made the lamp circuit series instead of parallel. I removed the jumpers / resistors and connected the LED's in series with wires and without mutilating the board. This was possible by removing 3 lamp holder pins and use the holes isolated to put the wires through. I added one multi turn pot to have the ability to change brightness. At day light it looked pretty close to original, but at night it was much too orange.
So, back to the drawing board.
I went from 60 mV bias to 40 mV and it sounds much better. Less boomy, more seperation between instruments. But I still wonder whether imaging can be improved. The M-2 I had spreads the instruments all across the room, but with the B-2 the instruments are very near the speakers.
I also changed the LED's to amber and made the lamp circuit series instead of parallel. I removed the jumpers / resistors and connected the LED's in series with wires and without mutilating the board. This was possible by removing 3 lamp holder pins and use the holes isolated to put the wires through. I added one multi turn pot to have the ability to change brightness. At day light it looked pretty close to original, but at night it was much too orange.
So, back to the drawing board.
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