Hey guys
I've been wondering about implementing a 50VDC heater elevation circuit on a planned B15N build.
It "looks like" tapping from the 50V bias tap of the power transformer is easier than creating a voltage divider on the B+. I've read a post on this forum where that is discussed and found to be a good idea. But when I googled " heater elevation on 50V bias tap" the AI answer is completely the opposite:
Why Not Use the 50V Bias Tap?
Low Current:
Bias supplies are designed for very low current (a few mA) and are high-impedance, which makes them unsuitable for driving the heater supply and achieving a stable elevation voltage.
Impedance Issues:
Connecting the heater supply to a 50V tap could result in an unstable or noisy elevation voltage, and could also affect the bias point of the power tube.
Not the Intended Function:
The purpose of heater elevation is to improve signal-to-noise ratio by moving the heater reference point above the cathode, which is not the function of a bias tap. So now I'm confused whether to do it on the 50V tap or not.
here's the post on EL34world:
https://el34world.com/Forum/index.php?topic=30961.0#google_vignette
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