100W Ultimate Fidelity Amplifier

[apexaudio]

I am not sure where to post it but I will take a chance and post the resaults here.

I have spend plenty of time with A9 based amp, lot of listening tests, measurements, swapping the resistors over and over (I only have to match VAS load resistors - I do not know exacly how to calculate them). The key was to find proper ratio (gain) in fallowing stages. I was recalculating bias in all stages with differed ratios + splitted NFB values and the bellow setup gave me the best resaults - H2 is dominating all the way threw audio band and the harmonics spectrum is very flat, amp sound superb.
Simple suff can sound and perform very well. Bellow prototype board and schematic.

Highly recommended!
Thanks Mile.


Regards

Nice work, can you share your OS
Regards

 

[borys]

The OPS is based on the HK/Slewmaster. The temperature compensation works very well.
Files are bellow, it is not easy to solder, board is small and dual layer.

Regards

 

[desertstorm]

yes, like this

Sir Apex sir thank you so much sir..god bless you sir..

 

[apexaudio]

The OPS is based on the HK/Slewmaster. The temperature compensation works very well.
Files are bellow, it is not easy to solder, board is small and dual layer.

Regards

Thank you,
Regards

 

[3388ton]

😛😛

 

[still4given]

I see your a pirate

 

[c08bm]

Aye, that be true

 

[kool lites]

Im not sure if this is a good question or not but any recommendation on the first Apex amp i should build? I am thinking of a bass guitar head for my daughter, driving a closed quad box.

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[apexaudio]

Im not sure if this is a good question or not but any recommendation on the first Apex amp i should build? I am thinking of a bass guitar head for my daughter, driving a closed quad box.

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G100 is guitar amp http://www.diyaudio.com/forums/analog-line-level/167363-mic-line-eq-preamps-4.html

 

[thimios]

The OPS is based on the HK/Slewmaster. The temperature compensation works very well.
Files are bellow, it is not easy to solder, board is small and dual layer.

Regards

Hi Borys ,can you share the IPS pcb?

 

[danielturcu]

Hello everybody , what power can deliver A-14 amplifier at +-36Vcc? Thanks.....

 

[kool lites]

G100 is guitar amp http://www.diyaudio.com/forums/analog-line-level/167363-mic-line-eq-preamps-4.html

Mile thanks. I have looked at that before. I would like to separate the pre amp from the amplifier. This will allow me to tailor the solution a bit.
I like your a 14 and ax 14 a lot and am wondering if they would be a good solution?

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[apexaudio]

Mile thanks. I have looked at that before. I would like to separate the pre amp from the amplifier. This will allow me to tailor the solution a bit.
I like your a 14 and ax 14 a lot and am wondering if they would be a good solution?

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AX11 and AX12 will be good for bass...

 

[apexaudio]

Hello everybody , what power can deliver A-14 amplifier at +-36Vcc? Thanks.....

Power will be same as any other amp with +/-36V rails: 50W/8R

 

[still4given]

Hi Borys ,can you share the IPS pcb?

http://www.diyaudio.com/forums/solid-state/264243-very-simple-hybrid-ampifier-3.html#post4331341

 

[thimios]

http://www.diyaudio.com/forums/solid-state/264243-very-simple-hybrid-ampifier-3.html#post4331341

Thanks Terry ,i see it just now!

 

[still4given]

I got the A9 IPS finished. With the right op-amp, it sounds wonderful. Being an IPS you can hook it up to some serious power. Very nice!

 

[andrewlebon]

Nice work Terry

 

[kool lites]

Still4given that is inspirational. I can't wait to finish my workshop remodel and start some serious playing

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[danielturcu]

@olafk soon you will release an improved layout for the A14? I'm interested of this project.....and I'm wondering if this amplifier can run in bridged mode.
Thanks a lot.