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Originally Posted by Electronic M
I think I may have a 1U6 in my tube stash.
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Be sure it's not mistaken for 1U4 or 1U5 which are different critters.
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Aside from the heater* is it compatible with the 1L6 and capable of opperating on SW?
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According to the posted article it is. But I can't verify it, and online info on it is scarce.
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* The heater could be worked around with a parallel resistor to increase the current draw to match the 1L6.
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The paralleled resistor (same ohms value as the filament when hot) does not increase current draw (which is a constant 50 ma.) but splits it in half for the tube. Remember that in a series circuit, current thru the whole string is constant. Whereas in a parallel circuit (imagine 6V paralleled heaters),
voltage is constant across the lot. Series = constant-current, parallel = constant-voltage.