My friend has done a simulation and keep R8 and 11 = 240R, and compare to R8 and R11 either 240R or 270R. It makes almost no difference but a hair more gain with 240R. He told me that it will loose just a little gain couple tenths of a db nothing else even all 4 positions with higher resistance ~ 300R.
My friend has done a simulation and keep R8 and 11 = 240R, and compare to R8 and R11 either 240R or 270R. It makes almost no difference but a hair more gain with 240R. He told me that it will loose just a little gain couple tenths of a db nothing else even all 4 positions with higher resistance ~ 300R.
Sorry typo! It should be:
"keep R8 and 11 = 240R, and compare to R2 and R4 either both are 240R or 270R."
You could look at the curves.
My impression is that they are the "same" tube, or super-similar. (Same heater power too.)
Any slight different in spec is clouded by tube-to-tube variation, and masked by the regulator. Real difference is the socket.
An observation: 500V CT will not make the 300V DC implied at the regulator unless load is very-very light.
My impression is that they are the "same" tube, or super-similar. (Same heater power too.)
Any slight different in spec is clouded by tube-to-tube variation, and masked by the regulator. Real difference is the socket.
An observation: 500V CT will not make the 300V DC implied at the regulator unless load is very-very light.
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