BD270_tubepre

[rafafredd]

https://picasaweb.google.com/rafafredd/BodangaBD270?authkey=Gv1sRgCJ26kOSZkqKJEA#

 

[lassoharp]

Looks good - yours?

I spy some ouncers and the Lynx audio iron I'm not familiar with.

 

[emrr]

I assume you made this; you are a total nutter and I like it. 

 

[Kingston]

Awesome project, clever layout with the compartments, might have to try that sometime. Front panel is the best I've seen in a long while.

 

[rafafredd]

Yes, It is mine.

I am using 9AU7 tubes. One triode gain/input stage and a SRRP output stage. UTC O1 on input, with multi-impedance switch to make use of all the windings available on the primary. It is like having multiple transformer to choose from. Each winding has its own sound.

The Lynx on the output are the best tube to line I have ever tried. These are made in Brazil by www.audiolink.com.br. Guilherme Peregrine is the name of the guy. All high quality M3 silicon steel lams, with a big stack. Massive transformer almost double the size of Jensens. Inductance is very high. I tested side by side with Jensens and other hi-end stuff, and the Lynx kicks butts.

 

[drask]

Really nice rafafredd.
Great project !

Maybe audio demo?

 

[rmaier]

Unbelievably cool! 8) If it sounds anywhere near as good as it looks, you're gonna kick serious butt.

 

[rafafredd]

Can't post any clips. I made this one years ago, and it is not in my studio anymore. It's gone. Someone got crazy for this and offered a big amount, so it was "there it goes..."

I have added details about impedance selector:

https://picasaweb.google.com/lh/photo/HBJrPkBTGhnr2epOylqELBJg8AYXEyrWGCWha0OV1OM?feat=directlink

https://picasaweb.google.com/lh/photo/wDXHFDuPWNtGinOSv55UQRJg8AYXEyrWGCWha0OV1OM?feat=directlink

 

[rafafredd]

Added schematics:

https://picasaweb.google.com/lh/photo/C5rC6sejyBofUVq8GFCsuxJg8AYXEyrWGCWha0OV1OM?feat=directlink