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06-12-2023, 02:11 AM
https://youtu.be/NX6W7Zc4XRY
Common Mode Power Filter / with 0.5 ampere load
In this video, I reduced the load current to 0.5 amperes, to be more in line with the current rating of the power transformer I am using.
Also, I emphasize one of the design goals of this unit to be voltage output adjustable. Reason being, I will go to some effort to
run my vacuum tube filaments right at 6.0 volts. Yes, the rating is 6.3, and I have read where others run filaments up to 7.0 volts.
I believe if filaments allowed to run at 7 volts or higher, those tube probably not live long. I run my filaments a little on the
cool side, and in the last 15 years, my equipment remains fully operational.
So, I did this video to show a response to messages, asking for both the adjustment in output voltage, and the ripple rejection.
Then, it occurred to me, why not run this same type of rig on a 600 volt / 200 milliampere plate power supply ?
Is this not the goal to have very low a/c ripple on the plate of a Single Ended Power Stage ? If so, it would solve a lot of
problems. As such, I would still consider building an external power amplifier for Surface, and using Surface as a preamp.
I don't want to build an audio stereo power amplifier using the 300b. Those tubes about $200 dollars each, and my ears just
not worth that kind of money. But, I would run a stereo power amp using a pair 6L6 power tubes, and I know Surface would be able
to fully drive a 6L6 with the plates running at 600 volts. Yes I know this level is higher than what the data sheet recommends,
but I am able to keep the plate current in check with combination bias and Electronic Power braking on the screen grid.
Common Mode Power Filter / with 0.5 ampere load
In this video, I reduced the load current to 0.5 amperes, to be more in line with the current rating of the power transformer I am using.
Also, I emphasize one of the design goals of this unit to be voltage output adjustable. Reason being, I will go to some effort to
run my vacuum tube filaments right at 6.0 volts. Yes, the rating is 6.3, and I have read where others run filaments up to 7.0 volts.
I believe if filaments allowed to run at 7 volts or higher, those tube probably not live long. I run my filaments a little on the
cool side, and in the last 15 years, my equipment remains fully operational.
So, I did this video to show a response to messages, asking for both the adjustment in output voltage, and the ripple rejection.
Then, it occurred to me, why not run this same type of rig on a 600 volt / 200 milliampere plate power supply ?
Is this not the goal to have very low a/c ripple on the plate of a Single Ended Power Stage ? If so, it would solve a lot of
problems. As such, I would still consider building an external power amplifier for Surface, and using Surface as a preamp.
I don't want to build an audio stereo power amplifier using the 300b. Those tubes about $200 dollars each, and my ears just
not worth that kind of money. But, I would run a stereo power amp using a pair 6L6 power tubes, and I know Surface would be able
to fully drive a 6L6 with the plates running at 600 volts. Yes I know this level is higher than what the data sheet recommends,
but I am able to keep the plate current in check with combination bias and Electronic Power braking on the screen grid.
