Retro Amp 50W Single Supply

[apexaudio]

AX6 in action
https://www.youtube.com/watch?v=gFbivge6oVY

 

[apexaudio]

AX6

 

[MasPaimin]

My Apex AX6

Hi Mr. Mile
This My Project not yet finish, I had trouble getting Transistor final 2N3773.

if i replace it with 2N3055, what other component must be replace?

Thanks.

 

[apexaudio]

Hi Mr. Mile
This My Project not yet finish, I had trouble getting Transistor final 2N3773.

if i replace it with 2N3055, what other component must be replace?

Thanks.

You can use 2N3055 with 60V DC rail maximum and without changes.
Regards

 

[thimios]

AX6

I like this pcb ,easy mounting transistors,where i can find this?

 

[MasPaimin]

You can use 2N3055 with 60V DC rail maximum and without changes.
Regards

Ok, Thanks sir

 

[MasPaimin]

i can't find transistor 911, what alternative part to replace it?

Simple regulated psu for AX6

 

[thimios]

i can't find transistor 911, what alternative part to replace it?

Can you share this pcb in pdf?

 

[apexaudio]

i can't find transistor 911, what alternative part to replace it?

Use MJE3055...

 

[MasPaimin]

Can you share this pcb in pdf?

Iam sorry , i have not this pcb in pdf

i have jpeg from here #142

 

[alexppk]

Hello,

What protection for speakers i can use for AX6 clasic?


thank you!

 

[nironiro]

Protection is output capacitor, so there is no need for another speaker protection

 

[alexppk]

Tthank you Nironiro!

 

[still4given]

I made a spice file but can't get it working. Can someone check it for me?

Thanks, Terry

 

[Mooly]

No ground and Q6 base not connected to where it should be

(its a bit lacking on bias current too)

 

[apexaudio]

AX8

 

[still4given]

No ground and Q6 base not connected to where it should be

(its a bit lacking on bias current too)

Thanks Mooly,

That got it working but it doesn't run right. Gain is very high. 0.5V on the input makes the negative wave clip. And right, bias is very low. Looks like Mile added a vbe multiplier to AX8. Maybe that is the one to build. I wonder if there is a layout for that one.

Blessings, Terry

 

[Mooly]

The gain is approximately equal to 1+(R18/R16) which is 45. Simulation bears that out with 64.4mv rms needed to obtain 2.86 volts output which is a gain of 44.5. The small discrepancy can be accounted for by the very small attenuation caused by R1 and the bias network.

The bias is easy to fiddle in simulation, just increase R11 to around 80+ ohms.

 

[still4given]

Here is a spice file for the AX8. It works OK but clips kind of ugly and it also has pretty high gain. THD .02.

 

[apexaudio]

Here is a spice file for the AX8. It works OK but clips kind of ugly and it also has pretty high gain. THD .02.

I add mising resistor and change some values...