Maximum DIY contents in the whole rig and never sounded this good….

[Hari Iyer]

For each tube about 310 volts at plate and 36 ma. Still a little under biased for me. I use non inductive resistors so looking for the appropriate values.

For me that's a very high cathode voltage. Typically I go for a cathode voltage that is approximately half of the plate voltage. The grid voltage will be calculated from the tube datasheet .

 

[yogibear]

For me that's a very high cathode voltage. Typically I go for a cathode voltage that is approximately half of the plate voltage. The grid voltage will be calculated from the tube datasheet .

Check data sheets of 6P14P-EV. That’s a beast of a tube and also E84L, rare and expensive…

I play with higher voltages these days, often 500-650 at plates.

In my experience so far, in auto bias, it’s quite a tied up game between the plate voltage and cathode resistor biasing and every iteration yields different results depending on the actual tube in use. And in this respect every single tube differ from the other despite being all nos.

 

[Hari Iyer]

Check data sheets of 6P14P-EV. That’s a beast of a tube and also E84L, rare and expensive…

I play with higher voltages these days, often 500-650 at plates.

My current amplifier plate voltage is around 545vdc and cathode is at 230vdc. Grid 1 voltage is 200vdc (Direct coupled). So cathode grid is -30vdc. Bias current is 43mA. It's a KT88 IDH used as a pentode. The grid 2 is 533vdc.

 

[yogibear]

My current amplifier plate voltage is around 545vdc and cathode is at 230vdc. Grid 1 voltage is 200vdc (Direct coupled). So cathode plate is -30vdc. Bias current is 43mA. It's a KT88 IDH used as a pentode. The grid 2 is 533vdc.

There are 100 ways of skinning a cat….

Tube world is no less crazy…. My all builds have different way of doing music. I do measure them and make sure both channels mirror image and then resort to just enjoy the music. Love to listen to what I build.