Studio Reference Amplifier

[44250]

APEX/Dragan100 STUDIO SR100H(hibrid)

if i have time tomorrow i wil do first plug-in...

 

[apexaudio]

APEX/Dragan100 STUDIO SR100H(hibrid)

if i have time tomorrow i wil do first plug-in...

Nice work...

 

[cuongdotvn]

How to adjust bias?
Thanks!

 

[cuongdotvn]

How much minimum voltage of the capacitor input is ?
I don't have high voltage capacitor

 

[44250]

https://youtu.be/rf9tKI2x7o4

 

[44250]

higher value is output signal (10V/div) and lower value is input signal (500mV/div).

 

[44250]

clipping at 1,5kHz and 15kHz:

 

[Zinyx]

Which one better sound, SR150 or SR100H ?

 

[44250]

SR100 is still on a test_bench and not wired as it should be. when i wire it properly I will compare those two. still,for a really good comparation they should be supplied with same power supply... SR100 is a really fast amplifier judging by 50 and even 70kHz square form test.

 

[apexaudio]

higher value is output signal (10V/div) and lower value is input signal (500mV/div).

Nice measurements.
Regards

 

[cuongdotvn]

SR200, Iam testing one pair 5200 1943.
1.5V on resistor 10R instead, 150mA.
45mV on 0.47R 5W.
DC OUT: 0,1 -> 2mV

Thanks apex and everybody!!!

 

[samratsarkar]

SR 200 - Query on Input Sensitivity and input impedance

Dear Sir/s,

Kindly share if you have information on these points regarding apex SR 200 power amp.

1. input sensitivity of SR200
2. input impedance of SR200.

This information will help us to have a matching Pre-Amp for this good amp.

Regards,
Samrat

 

[apexaudio]

Dear Sir/s,

Kindly share if you have information on these points regarding apex SR 200 power amp.

1. input sensitivity of SR200
2. input impedance of SR200.

This information will help us to have a matching Pre-Amp for this good amp.

Regards,
Samrat

Sensitivity 775mV, input impedance 47k.
Regards

 

[samratsarkar]

Preamp matching for Apex-SR200

Sensitivity 775mV, input impedance 47k.
Regards

Thank you Sir for quick reply.

My pre-amp has output impedance 1K and gain of 12db, which with a 500mv signal will give 2.0 volts output.

Will this Pre-amp work well with SR-200 AMP DESIGN?


Regards,
Samrat

 

[apexaudio]

Thank you Sir for quick reply.

My pre-amp has output impedance 1K and gain of 12db, which with a 500mv signal will give 2.0 volts output.

Will this Pre-amp work well with SR-200 AMP DESIGN?


Regards,
Samrat

Yes this preamp will work, but I suggest preamp from this thread.
Regards

 

[toreto009]

Hello everybody!! Who has a PCB for this amplifier, please share. Or maybe there is a better version?

 

[Zinyx]

Hello everybody!! Who has a PCB for this amplifier, please share. Or maybe there is a better version?

This post is PCB > http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-117.html#post3535896

 

[toreto009]

This post is PCB > http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-117.html#post3535896

Thank you

 

[xrk971]

Apex Audio,

Do we really need JFETs for the CCS's on this FET buffer amp? They are hard to find or expensive. Can you suggest an alternate BJT CCS version that retains 2SK174 and 2SJ74?

Perhaps 2N5551 or 2N5401 can be used?

Thanks,
X

 

[isidore kanerusine]

hi, can anyone give an idea that works, I have a 80-0-80Vac transformer but I need to get 100-0-100Vdc how do I do it? given the formula 80v*1,41=112,8vdc.