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#11

03-29-2025, 07:17 PM

Electronic M Electronic M is online now

M is for Memory

Join Date: Jan 2011

Location: Pewaukee/Delafield Wi

Posts: 15,471

I don't think I have ever seen a set where the 5U4 doesn't have its own heater winding... Only time there's another tube on the 5U4 winding it's a second 5U4 put in parallel for increased B+ current capacity...the 5U4 heater is always the B+ source so if anything else shared it the heater cathode voltage would violate tube specs.

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