Studio Reference Amplifier

[44250]

APEX You have started pcb for 200 series and have done more than half,have You finished it? If You have finished it,would You share that design with us? Greetings!

 

[apexaudio]

Hi Mr. Mile Sir,


With +/-110V rail voltage, Can I bridge the SR200 circuit to have 1500W/8R? If so, what are the parts I may need to change?


Thanks,
Blueice23

With +/-110V rail I suggest 12 pairs of outputs (it's class AB), and you need add bridge circuit on separate pcb with balanced inputs and low-cut filter...

 

[apexaudio]

APEX You have started pcb for 200 series and have done more than half,have You finished it? If You have finished it,would You share that design with us? Greetings!

It's pcb for SR400 not SR200, and it's for my comercial amps not for share.
For DIY SR200 you can use pcb design made by 'alex mm'.
Regards

 

[apexaudio]

Hi Mr. Mile Sir,


With +/-110V rail voltage, Can I bridge the SR200 circuit to have 1500W/8R? If so, what are the parts I may need to change?


Thanks,
Blueice23

This is circuit for stereo/bridge mode.

 

[blueice23]

Correct board?

Hello Mr. Mile Sir,


I just want to know if this PCB layout is correct? (please see the attached files)

I will use this PCB for my SR200 ref amp.


Regards,
Blueice23

 

[blueice23]

This is circuit for stereo/bridge mode.

Hi Mr. Mile Sir,


I have an existing bridge adapter circuit already and i'm using it with my other amplifier. It has a balance input configuration too.

Thank you once again for your assistance.


Regards,
Blueice23

 

[apexaudio]

Hello Mr. Mile Sir,


I just want to know if this PCB layout is correct? (please see the attached files)

I will use this PCB for my SR200 ref amp.


Regards,
Blueice23

This pcb design by 'alex mm' not tested, but look OK, you can try it and come here if there was some problem.
Regards

 

[44250]

It's pcb for SR400 not SR200, and it's for my comercial amps not for share.
For DIY SR200 you can use pcb design made by 'alex mm'.
Regards

My mistake-You´re right,sorry. These days I will compare schematics with alex mm` s pcb design. Greetings!

 

[Deleted member 148505]

Hi apexaudio

What sr200 PCB is already tested?

Thanks

 

[apexaudio]

Hi apexaudio

What sr200 PCB is already tested?

Thanks

Post #167

 

[apexaudio]

Headphone Amplifier for 32 ohm or more with TO92 mosfets, 100uF can be shorted if there is no DC offset on output (drains).

 

[carlmart]

SR200 Studio Ref Amp for large studio monitors.

How would you implement dual FETs, like LSK389, on the LTP?

It might be interesting o try it.

 

[dentarthur]

Recommendation SR100?

Hi Apexaudio,

If I have one 2x60 750VA trafo. Would you recommend a regulated PSU with 2 pairs of end-T's and would it be OK to have 2 pairs of end-T's in the SR ... making it something near SR100?
I want to build a stereo amp for HiFi use.

Koos

 

[apexaudio]

How would you implement dual FETs, like LSK389, on the LTP?

It might be interesting o try it.

Dual FETs like SK389 is not available in my area.

 

[apexaudio]

Hi Apexaudio,

If I have one 2x60 750VA trafo. Would you recommend a regulated PSU with 2 pairs of end-T's and would it be OK to have 2 pairs of end-T's in the SR ... making it something near SR100?
I want to build a stereo amp for HiFi use.

Koos

I suggest to set +/-65V DC with 2 pairs of outputs for Hi-Fi use.
Regards

 

[carlmart]

Dual FETs like SK389 is not available in my area.

OK, then two FETs that ARE available in your area...

 

[apexaudio]

OK, then two FETs that ARE available in your area...

LTP in Stidio Reference Amp use PNP transistors, for next amp I will use topology with N-FETs in LTP.

 

[carlmart]

LTP in Stidio Reference Amp use PNP transistors, for next amp I will use topology with N-FETs in LTP.

Great. I'm looking forward to it.

 

[apexaudio]

:

Great. I'm looking forward to it.

Amp will be like 'Ultimate Fidelity' with DC servo, and cascode instead super baxandal pair in VAS... I don't want made another 'Goldmund' clone

 

[carlmart]

:Amp will be like 'Ultimate Fidelity' with DC servo, and cascode instead super baxandal pair in VAS... I don't want made another 'Goldmund' clone

I've seen several designs that use baxandall pair in VAS, much before Goldmund's, like Luxman, etc. I think you should keep that, because it does work very well and should have a good part in the amp's sound.