Improving on X-BosoZ to mate the F4

[Babowana]

Sound is clean and true, but involving and unobtrusive. Acoustic material sounds a bit warm. Dynamic is high and stage is very wide and deep. Details are present but the whole presentation is balanced, nothing pokes you in the eye (ear).

Weow great I'm motivated for F4 . . .

 

[Zen Mod]

Weow great I'm motivated for F4 . . .

if ya still have problems with eeny weeny jfets for it , just say

 

[juma]

if ya still have problems with eeny weeny jfets for it , just say

Well, this way the JFETs are not needed anymore

 

[steenoe]

Yes, another F4 could be run from Q6's (IRF510) drain in order to bridge them. Offset can be regulated by means of P2 in F4.

Sound is clean and true, but involving and unobtrusive. Acoustic material sounds a bit warm. Dynamic is high and stage is very wide and deep. Details are present but the whole presentation is balanced, nothing pokes you in the eye (ear).
This is my impression after two days listening. Now I'll have to tear the prototype apart in order to build it properly.

Juma, nice to have one more confirming that my ears heard right Not that I dont trust my own ears, but the F4 is in fact a bit surprisingly good sounding! I like it very much with the X-CCS-BosoZ set for 20dB gain.

Steen

 

[Babowana]

if ya still have problems with eeny weeny jfets for it , just say

Still I have problem with time.
I will see few months later, thanks, ZM.

 

[iwahn]

this is what made a wining combo: modified BOSOSZ-CCS and F4 without input buffer (one stage less in the signal chain).

With out any jfets in the circuit, it should be possible to use higher voltage rails. An irf510 could also drive more fets. Have you tried any of this?

regards

 

[Carl_Huff]

Russ,

I just found this thread and your Lotus preamp project has caught my attention. What is it's status? Did you ever do a board layout or actually build and listen to the circuit?

I've got 90 percent of the parts on hand. I am tempted to build it from your last published schematic.

Best Regards,
Carl Huff

 

[Russ White]

Hello,

I have built the version in this post for testing:
http://www.diyaudio.com/forums/showthread.php?postid=1200372#post1200372

It worked just fine, and sounds great! You may want/need to adjust the resistor values a bit. And in some cases you will probably want a pot instead of a resistor so you can adjust bias etc.

Its a fine circuit, very much like Terry's XBOSOZ, but I got started on something I like even better... More details on that later when its been better proven.

Cheers!
Russ