100W Ultimate Fidelity Amplifier

[apexaudio]

I thought so(the marking doesn't look good), but maybe it is original one...
I saw at post #3317 there are AX-14 also use jengkols (with better marking)
but don't worry I have spares some old motorola 15003-15004 if this one is blown 😀
I will try at rail +/-55VDC for 8 ohm load, is it is okay?
if they were original I believe they wont fail 😀 it is worth to try


I just realize it ... & I will try to redraw it if needed 🙂 & fortunely I have some LM4562 😎

Regards

No need to redraw...

 

[mjmillar]

Are these PCB's available for sale anywhere? Quite fancy building some of these!

 

[olafk]

Very first draft with mirrored output transistors. Can someone check it please?
A schematic would be very helpful 😉.

regards

 

[vargasmongo3435]

Very first draft with mirrored output transistors. Can someone check it please?
A schematic would be very helpful 😉.

regards

I see a inverted 1N4148 make sure all is corrected before you continue, I think the original layout look good no need to redraw 🙂 kind look like vintage style traces I like it 🙂

Regards
Juan

 

[olafk]

Eagle eyes 🙂

Thank you Juan!

 

[Vostro]

Can someone please point me to the A17 schematic please

Thanks

 

[apexaudio]

Very first draft with mirrored output transistors. Can someone check it please?
A schematic would be very helpful 😉.

regards

Bias transistor must be replaced with BD139 or MJE340 in your pcb.
Regards

 

[zoky2]

AX-11 with some very old TO3 output transistors. The power suply is +- 53VDC and it play very good,very silent without signal.Love the sound.

Regards
Zoky2

 

[apexaudio]

A17 CFA

 

[zoky2]

Sorry,here are some picture of AX-11.


Regards
Zoky2

 

[apexaudio]

Sorry,here are some picture of AX-11.


Regards
Zoky2

Nice work,
Regards

 

[olafk]

A17 CFA

Hello Mile,

thanks for schematic. I will check the layout and then build a version.
For what other transistors you recommend a heat sink or mounting on the main heatsink?

Thank you for a new amplifier 🙂. Feels like an early Christmas

regards Olaf

 

[apexaudio]

Hello Mile,

thanks for schematic. I will check the layout and then build a version.
For what other transistors you recommend a heat sink or mounting on the main heatsink?

Thank you for a new amplifier 🙂. Feels like an early Christmas

regards Olaf

A9 CFA

 

[lighat]

dear mr apex,
I want to make a power subwoofer, what type recommended to drive 2 ohm 200 watts speaker

 

[lighat]

dear mr mile,
I want to make a power subwoofer, what type recommended to drive 2 ohm 200 watts speaker

 

[apexaudio]

A17 new pcb

 

[lighat]

A17 new pcb

thanks mr mile, and what psu recomended for it, vac dan va

 

[apexaudio]

thanks mr mile, and what psu recomended for it, vac dan va

Outputs and bias transistor are from botom side of pcb... A17 use psu and protect same as AX11.

 

[apexaudio]

AX9

 

[apexaudio]

AX9 pcb size 100x70mm