Hi, I made ecc88 hybrid headphone amplfiier.
I try to find out best Plate voltage for this schematic ? Because ECC88 maximum plate voltage is 90V. What maximum Voltage ? and mA ? position in schematic should be.
I plan to use Tube plate voltage 48V, but I worry opamp will be died because my opamp maximum voltage is 24V.
I try to find out best Plate voltage for this schematic ? Because ECC88 maximum plate voltage is 90V. What maximum Voltage ? and mA ? position in schematic should be.
I plan to use Tube plate voltage 48V, but I worry opamp will be died because my opamp maximum voltage is 24V.
This is just a "toy" schematic , if you want hi-fi find something else
Nothing is good to worth the effort to modify it
Nothing is good to worth the effort to modify it
You have to set the plate resistor so as to have 12v across it for this to work well.
It would be better to use 48v for the tube and drop that to 24v for the op amp. The bias it with a couple of 470k resistors to get 12v at the + input. Then use a 0.1 uf capacitor to the plate of the tube.
It would be better to use 48v for the tube and drop that to 24v for the op amp. The bias it with a couple of 470k resistors to get 12v at the + input. Then use a 0.1 uf capacitor to the plate of the tube.
