Extreme DIY.

[SteveTheShadow]

And here is the finished product, sounding bloody superb.

B5A319F3-4FEF-4552-8BF1-695C0AC6C3C7.jpeg (119.9 KiB) Viewed 1290 times

Seems all my assumptions turned out to be right on the money.
A push-pull output transformer can be converted to single ended. There will be limits on the power you can get out of one, but the sound can be stunningly good. But FFS don’t expect to run 845s off one.

And it goes without saying; don’t try this at home.

[antonio66]

I don't really understand much of what you've talked about, but the end product looks stunning`.

[Grumpytim]

Rolling your own transformers is pretty epic, I'm pleased it worked out for you and didn't go bang.

[Wonfor14]

As you are familiar the gap is to stop saturation and thus allow fuller use of the B/H curve.
What would happen if we fitted in the core a linear Hall Effect transistor, and then with a reverse winding applied a DC to push the B/H curve back to close to the Negative end.
Would it allow you to use more of the curve thus more power.
OK it would have to have very low frequency cut of let say 1Hz well out of the audio band usefulness, what do you think ?
Would it allow us to use the straight line part of the core?
And could we use say Arnold Core material as used in MagAmp PSU designs?
These have a very vertical B/H curve.
Just an idea.
Or am I writing

[SteveTheShadow]

Hmm ….. a Hall Sensor buried in a transformer core. I’ve no idea whether it would work. It’s certainly intriguing, and beyond my meagre capabilities.

[Geoff.R.G]

As you are familiar the gap is to stop saturation and thus allow fuller use of the B/H curve.
What would happen if we fitted in the core a linear Hall Effect transistor, and then with a reverse winding applied a DC to push the B/H curve back to close to the Negative end.
Would it allow you to use more of the curve thus more power.
OK it would have to have very low frequency cut of let say 1Hz well out of the audio band usefulness, what do you think ?
Would it allow us to use the straight line part of the core?
And could we use say Arnold Core material as used in MagAmp PSU designs?
These have a very vertical B/H curve.
Just an idea.
Or am I writing

I think the effects would be dependent upon the characteristics of the hall effect transistor. From, poor, memory I think they can be non-linear which wouldn't be terribly clever.

[Wonfor14]

There is few that are linear made by Maxim and A.D.