by Ty_Bower » Mon Dec 24, 2012 7:46 am
justinsweber wrote:This will prob yield a output @ ~8watts?
Keep in mind the TubeCAD SE software that Shannon is using to model the circuit is calculating a peak output voltage and using that to determine output power. All your math seems to suggest you are measuring an RMS voltage. In other words, the 4 watts RMS you've measured is the same as the 8 watts peak predicted by the model. Again I will say, you are not going to hear (or even measure) a significant difference by changing out your 670 ohm cathode resistance for 400 ohm. The difference in power output will be measured in tenths of a watt. Even replacing your output transformer with a 3.5K unit might get you close to 5 watt RMS (Shannon's last model), but I don't think that is what you are after.
Don't let me discourage you, though. Half the fun of this hobby is tinkering with the circuit and seeing what it does. It's a great way to learn.
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