very nice, simple circuit. And further support of my contention that with tube amps, there has been nothing new since perhaps 1970, or so (very probably 1960) but for a few tube variants. We try to make a better mousetrap, but soon realize that the good old Cat still does it best.
Peter Wieck
Melrose Park, PA[/quote]
--------------------------------------------------------------
Here is something definitely new since 1960 AFAIK. I did this one in the late 1990s. It was published in Glass Audio & Electronics World (UK). No one ever came forward to say it had already been done.
The cct is has a simple mod to make driving very low mu power triodes easy. In a following article I shewed a another way not requiring a UL OPT.
This amp makes an easy 30 Watts. The distortion plot shows THD to be down 44 db (0.6%) at 25 Watts. Some guy in SE Asia is building the amp commercially without permission. One of the buyers contacted me since his copy did not perform well. I could see the biasing circuit was screwed up.
I've put all the amplifier information into a PDF of 1850 KB. Just ask-
johnnhelen4-------gmail
You know the drill!
Cheers to all, John L Stewart PEng
|