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  • 2 months later...
Posted (edited)

X-altra MM/MC phono stage.

A project published on audioexpress a few years ago and a different design approach compared to my Simplistic phono designed by Salas over at diyaudio.com

 

Will be fun to compare both. 

 

IMG_8870.jpeg

Edited by MASantos
  • Like 2
  • 2 months later...
Posted

Aerial picture of a balanced amplifier for dynamic headphones. Only light from LEDs and tubes. ISO-25600, F4, 1/13 sek.
BZ8A0587.jpg

And in day light. 4 x 2A3, 4 x 12BH7, 8 x switch mode filament supplies, 2 x GRHV and 4 x transformers.
BZ8A0580.JPG
BZ8A0583.jpg

DIY is still fun. 

 

  • Like 6
  • Thanks 1
Posted
5 minutes ago, JoaMat said:

Aerial picture of a balanced amplifier for dynamic headphones. Only light from LEDs and tubes. ISO-25600, F4, 1/13 sek.
BZ8A0587.jpg

And in day light. 4 x 2A3, 4 x 12BH7, 8 x switch mode filament supplies, 2 x GRHV and 4 x transformers.
BZ8A0580.JPG
BZ8A0583.jpg

DIY is still fun. 

 

All it needs is an Unobtanium case...😁

Posted
10 hours ago, JoaMat said:

Aerial picture of a balanced amplifier for dynamic headphones. Only light from LEDs and tubes. ISO-25600, F4, 1/13 sek.
BZ8A0587.jpg

And in day light. 4 x 2A3, 4 x 12BH7, 8 x switch mode filament supplies, 2 x GRHV and 4 x transformers.
BZ8A0580.JPG
BZ8A0583.jpg

DIY is still fun. 

 

Very cool! How do you couple output stage to headphones, doesn't look like output transformers are used?

Posted

No output transformer. There are output electrolytics to headphone.

Schematically it looks something like this.

Screenshot_61.jpg

Reason for three KSC2690A in CCS is to distribute the heat, so no heat sink needed. At the moment I only use two transistors in CCS due to insufficient transformers.

I don’t know how to optimize the circuit, but I’m happy with the result.

  • Like 3
Posted

A few words regarding filament supplies I’m using with 2A3 and 300B tubes.

9 VAC => unregulated 11 VDC => XL4015 DCtoDC step down converter...700x700-quick_6d_31_73dd_41017071-4.jpg

... with trimmers for output voltage and current limiter. It’s easy to set voltage to correct voltage depending of tube and also to trim current to achieve a sort of soft start. So far it works ok.

  • Like 3
  • 1 month later...
Posted

It's been approximately eleventybillion years since I actually built something and I'm not sure that this qualifies but at a minimum, i finally assembled and wired something that I've been procrastinating/avoiding for like two years.  I present, the IcePower 1200AS2 in a Ghent Audio case.

IMG_7891.jpeg

I'll post a completed picture at some point but it looks like a black box.  Not entirely sure what I'll do with it.  Maybe I'll build a set of bookshelf speakers to overpower?

  • Like 6

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