Before somebody else jumps in and tells you exactly where you should run your tube I'd like to encourage you to experiment a bit. It's easy to try different operating points and ultimately, it's the only way to know for sure - and especially simple if you already know the current you want to run.
Put a constant current source on the plate of the tube set for your desired 6mA. Then, just by changing the cathode resistor so that IR=Vbias wherever you want to check out on the plate curve chart at 6mA you can get different corresponding plate voltages. It frees you up from depending on people's advice that may not actually work as well for your application as it did for theirs.
It's also a good part of the fun.
Put a constant current source on the plate of the tube set for your desired 6mA. Then, just by changing the cathode resistor so that IR=Vbias wherever you want to check out on the plate curve chart at 6mA you can get different corresponding plate voltages. It frees you up from depending on people's advice that may not actually work as well for your application as it did for theirs.
It's also a good part of the fun.
Hi Sy. Yes. In the calculations that I made I got 2500hz (I can be wrong).
Of the few tubes (preamp) that until today I tested, 6dj8 is distinguished for the basses, but it loses a little in the remaining frequencies (my opinion).
I like to place the control of volume between the 1 and the 2 stage, with 10k or 4k7 pot, and for this requirement of current I think that 6dj8 is a good candidate.
Of the few tubes (preamp) that until today I tested, 6dj8 is distinguished for the basses, but it loses a little in the remaining frequencies (my opinion).
I like to place the control of volume between the 1 and the 2 stage, with 10k or 4k7 pot, and for this requirement of current I think that 6dj8 is a good candidate.
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