Aksa 55 building problems..

[Zohaib Ahmad]

Recently I built aksa 55 amp wiring was ok but amp is not working when I power on amp the amp osculates. I don't know where is the problem and how to solve it I just made it using the schematic..can any one help me here to solve my problem many thanks.

 

[meanman1964]

I've build the same amp and it did work flawless .
Q4 needs to be on top of Q7

 

[meanman1964]

Any pics of the build ?

 

[Zohaib Ahmad]

I've build the same amp and it did work flawless .
Q4 needs to be on top of Q7

Thanks sir for your comment I just changed r4 from 2k to 10k now amp is working fine and also sound quality is good..😊

 

[AKSA]

R4 should be 2k, or at most 2k2.
It should pass one half of the current delivered to the long tailed pair, which should be 0.72mA, set by R3 47k.
Keep going, you are nearly there.......

HD

 

[Zohaib Ahmad]

Thank you so much Hugh dean sir for this beautiful amplifier.I have built many amps all were good. But first time I build aksa 55 amp and this is very cool sound quality is excellent also its dynamic bass is very good sir.. I am falling in love with this amplifier. Listening it for long time.. Now I am going to make stereo version of this amp and will post some pics here very soon...
Once again thanks sir for sharing it with us I am very happy with it just enjoying the sound of Aksa 55 beautiful amp..

 

[AKSA]

Thank you Sir! You do me proud. 😊😊
Hugh

 

[Zohaib Ahmad]

I have have seen there is r7 on conceptional schematic of aksa 55 without any value.
Does any body knows what is value of r7 on real aksa?

 

[AKSA]

Zohaib,
I think R7 passes from speaker output to top of fb bypass C2 cap. Can you check?
It should be 1.5 times the value of the series fb resistor, so it's 68k.
It improves clip recovery by draining the DC voltage on C2 in overdrive situations.

HD

 

[Zohaib Ahmad]

Dear respected Hugh Dean sir thank you so much for your valuable feedback.