Other than John Broskie's TubeCAD blog, I can find no reference on the so-called Blumlein Garter circuit, where did the term come from? Did Blumlein actually invent it? Any clue or feedback will be appreciated.
What is the point of cross-coupled positive feedback in a bias circuit? You get slightly better pair matching, but slightly worse bias stability. Is that a good tradeoff?
It works extremely well at keeping currents balanced. I would say its good enough to eliminate the gap in a PP transformer which can significantly improve performance overall.
Shoog
Shoog
No but some tube lover called Merlin (I assume Mr Blencowe) did state he had done some research into it's history. Hopefully he will pop up.
I think Merlin mentioned that he was pretty sure it was not invented by Blumlein, but I don't know if he found where the circuit was first used...
Would you know how to get copies of the UK patents by Blumlein? He had hundreds of patents, it could be buried in one of those filings... who knows?!
