Quote:
Originally Posted by decojoe67
Aha! I noticed that on some sets. Very clever. This thread is really revealing a lot about these portables!
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My favorite lugables are the Emerson models 505 & 523 post-war or the pre-war FU424. These were 3 way portables That had the elegant design of having a higher power output stage for use on the AC-DC mains, 1 watt vs 250-300mw on batteries. They designed the tricky way running the battery tube filaments from the cathode of the line audio output tube. Some models used a 50B5 and 35W4 and others used a 117N7, combination penthode and rectifier
A few other firms built a variation of same.
They sounded a lot better than the others that ran the battery output tube when using it on AC or DC.