Hello. I've been tinkering with tube circuits in scant spare time for about 5 years now, and have somehow never come across how one determines what OT primary impedance to choose when building a power amp. So far, I seem to have lucked out, but I'd like to know if there is some sort of model/equation that can be easily applied. I've looked around a bit, but have not found an answer to this.
For example, let's say I have a power stage that has 2 6V6's (one push, one pull, pretty straightforward). Voltage drop from anode to cathode is 355 volts, biased to 36mA. What OT primary would I choose? So far, the method I have used is as follows:
Single Tube Z = U/i
Push-Pull Z = U/sqrt(2)*i
(Divide result by number of tubes per side)
In this case, 355/(1.414*0.036) = 6900 ohms. It occurs to me that this method is probably not correct at all, but the numbers seem close (serendipity?). Thanks for your help!
For example, let's say I have a power stage that has 2 6V6's (one push, one pull, pretty straightforward). Voltage drop from anode to cathode is 355 volts, biased to 36mA. What OT primary would I choose? So far, the method I have used is as follows:
Single Tube Z = U/i
Push-Pull Z = U/sqrt(2)*i
(Divide result by number of tubes per side)
In this case, 355/(1.414*0.036) = 6900 ohms. It occurs to me that this method is probably not correct at all, but the numbers seem close (serendipity?). Thanks for your help!
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