Drop the B+ to 200ohm. 337 is too low. You want 340 to 345. Then test cathode again. If those are the only resistors in the ballpark, put the 220 on the cathode, and the 200 on B+ and test.
Thanks,
Josh
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Drop the B+ to 200ohm. 337 is too low. You want 340 to 345. Then test cathode again. If those are the only resistors in the ballpark, put the 220 on the cathode, and the 200 on B+ and test.
Sure, why not? Small changes aren't going to hurt anything.
That is good! How does it sound??
Use a calculator: https://robrobinette.com/Tube_Bias_Calculator.htm
No problem! Personally, I'm not a fan of UD.kinmike wrote: ↑Sun 09/15/19 9:39 amJosh,
As always, thanks for the quick response. The Robinette site is very convenient. My plate dissipation is around 9 watts. I was using the method I described above to allow evaluating each tube individually. Saw it on Uncle Doug on YouTube. Still not sure what I did wrong but I didn't really spend much time on it.
These tubes are about 12 years old, EI's from Yugoslavia. They're supposed to be matched so I should be good.
Mike