Rouge Un - a red preamp featuring Lundahl , 5534 & pumpkin output

[Dylan W]

Hi guys, here it the guy, winded back (still with the white top insulation) but it goes well with the winding job.View attachment 143780 I still wait for the exact core material and shield tape but it will happen. Stay tuned!

Amazing work.

Guessing core material should not be super critical because of the amount of feedback around it. TBH I have always guessed that Rupert did it this way as a cost-saving measure, an audio transformer wound on a cheap power transformer core with lots of feedback is cheaper and easier to mass-produce than a layered audio transformer.

Can you share some details about the construction? Is it a ferrite, a strip of GOSS (like a power tx), or something higher perm?

 

[thomasdf]

Looks like a glazed doughnut!

Even more when sipping on my morning coffee !

 

[Moby]

Looks like a glazed doughnut!

Should I keep it like this? I like it And to rename it to the "doughnut".a? If many people like this reply I will understand it as "yes"

 

[Moby]

Amazing work.

Guessing core material should not be super critical because of the amount of feedback around it. TBH I have always guessed that Rupert did it this way as a cost-saving measure, an audio transformer wound on a cheap power transformer core with lots of feedback is cheaper and easier to mass-produce than a layered audio transformer.

Can you share some details about the construction? Is it a ferrite, a strip of GOSS (like a power tx), or something higher perm?

It's grain oriented steel, heavilly shielded everywhere possible. Shielding material is something unusuall and it has to be custom made. Otherwise it's not so complicated. I already tested 6 diferent core materials and I wait for two more. One is close enaugh. I will reply as soon I recieve the rest of the samples.

 

[JMan]

Should I keep it like this? I like it And to rename it to the "doughnut".a? If many people like this reply I will understand it as "yes"

That re-name is cute But everyone know orange sounds better! In all seriousness though, while I think the orange gives the pumpkin a unique look, I vote for whatever is easiest and most cost-effective (if there is even any meaningful effect on cost).