X-Altra Line Level Preamp

[wirewiggler]

Thanks,
Be safe.

 

[Bonsai]

👍

 

[kedar110]

Hi Bonsai,
everything is fine. The board works without problems. KX amplifier as well. They make a perfect couple.
Line Level Preamp is excellent buffer. I would plead for a relay attenuator of the same size.
Thank you so much

 

[Bonsai]

Thank you 🙏

The relay attenuator would make an interesting project!

👍

 

[ret12]

I build the xaltra preamp and i whant to understand the benefits using this type of dc offset adjust in input fet gate. Looking in similar preamps like onkyo p3060,sansui ca-f1 i observe that biassing is diffrent. Personaly i try the below method (sansui) and is work.

 

[Bonsai]

There really aren't any advantages/disadvantages either way IMV - it's just the preference of the designer. The X-Altra JEFT input discrete line amp uses a resistor to set up the LTP source current, so it's simpler than using an active current source (TR07 above).

 

[ret12]

Ok.

 

[Bonsai]

BTW there is a new X-Altra Mini II Line level preamp coming soon. Much, much easier (and cheaper) to assemble but with the same specifications and facilities

https://hifisonix.com/news/x-altra-mini-ii-big-board/