quote:
"Regarding the phase inverter, the stock design does not have sufficient dynamic headroom to drive the 6V6s all they way into clipping. The fix is simple and does not require a lot of Torres nonsense. You simply move the B+ supply for the phase inverter (only) up one notch on the power supply voltage divider chain. The increased voltage available to the PI will prevent it from clipping before the 6V6s do. This is what takes the typical Princeton from being a 12 Watt amp up to 18 Watts.
One other thing, the input cap to the PI is a fairly large value considering how high the input impedance of that stage is. This allows too much low end through and can make the thing sound farty at high volumes. I reduced the cap to 1/4 it's original value and the fartyness disappeared.
Like I mentioned earlier, a C10Q speaker really makes a world of difference in these amps." |
1/7/2000 2:18 AM