1954 BOGEN Bass Control

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You know, that's a key point. I should have thought of that from the many vintage tube radio schematics I have. There were sometimes many revisions. Often there were just plain mistakes! Uncorrected.

And this just in! I located the instruction manual. The controls do indeed work as intended. Bass control does not affect mic! So, it appears this has not been rewired, and the schematic may have had unpublished revisions, as Boobtube suggests.
 
Yeah, some of these older designs leave me scratching my head too. It's probably as you were thinking, something to do with the bass control having to act differently for the phono than for voice. After all that's what the PA function is for, voice. There needs to be a wider band of frequencies adjusted for phono than for voice so the design works differently for phono than voice. When in doubt, use logic 😉

Guess we had it figured out all along!:cheers:
Or at least towards the end.
 
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Guess we had it figured out all along!:cheers:
Or at least towards the end.

Yes, and thanks again for your logic! And it's kind of a nice feeling to figure out the mystery of design when publications aren't available. And yes a toast o' the suds to you too. That's exactly what I'm doing at this moment: Genesee Cream Ale. Made right here in Rochester, NY. I don't partake often, but tonight is a designated Genny Cream night. Hell, it keeps me warm--we're below zero here! So here's to you, tube :cheers:
 
Lots of fun, too. Good for you for the detective work on getting the schematic(even though it was slightly different, it still helped a lot) and the owner's manual.

Hey, I overlooked that you're in Minn! YOU get way colder winters than I do up here. Yeah, I love the detective work, especially with the internet. I remember as a kid trying to get info by asking every one I knew or sifting through complex electronics books. Lordy! Now, a few clicks and there it is. Too bad there are so many criminals on the net. It really is the ultimate encyclopedia (save for the fact that anyone, regardless of experience, can post anything anytime; thank the high heavens when that original documentation can be unearthed).
 
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