I'm a little confused.
Can you run the simple se on different tubes (EL33/KT88 etc.) by just switching tubes (assuming that the power transformer is up to the task providing the correct B+ voltage) or do you have to change the cathode resistor for each tube type?
I've seen the chart on George's web site, I assume that you don't want to be in the red, and to choose a cathode resistor that is in the black.
I was also hoping to assume that I could just use the resistor thats in the parts list.
Thanks,
Paul
Can you run the simple se on different tubes (EL33/KT88 etc.) by just switching tubes (assuming that the power transformer is up to the task providing the correct B+ voltage) or do you have to change the cathode resistor for each tube type?
I've seen the chart on George's web site, I assume that you don't want to be in the red, and to choose a cathode resistor that is in the black.
I was also hoping to assume that I could just use the resistor thats in the parts list.
Thanks,
Paul
Or you can be lazy like me and just use one resistor value for all of the tubes. It's not perfect for any one tube, but the 560ohm specified in the parts list works for all of the tubes for me.
You just need to make sure your B+ is close to the values in the table or you will have to take out the meters...
You just need to make sure your B+ is close to the values in the table or you will have to take out the meters...
I have a rotary switch with a different set of resistors depending on which tube I'm running.
I've seen some people add several resistors this way to fine tune the bias.
My SE amp schematic
Glenn
I've seen some people add several resistors this way to fine tune the bias.
My SE amp schematic
Glenn
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