Studio Reference Amplifier

[apexaudio]

Voltages on zeners 15.87V , on resistors R16,R17 - 1.6V and on R27,R28 - .98V

powered with 65-0-65VDC, what do you say Mr.apex

Voltage measurements is OK

 

[shravanth]

Voltage measurements is OK

apex sir R24-10K 2watt Resistor has burnt in 20mins

 

[apexaudio]

apex sir R24-10K 2watt Resistor has burnt in 20mins

From your measurements there is 73V on R24-10k . Disipation is P=U2/R or P=(73x73)V/10000ohm=0,533W and you use 2W resistor.

 

[samratsarkar]

Specs for SR-200 Amp

From your measurements there is 73V on R24-10k . Disipation is P=U2/R or P=(73x73)V/10000ohm=0,533W and you use 2W resistor.

Dear Apex Sir,
I would like to get some specs for SR-200 amp.I am using 70 VDC PSU for this amp.

SPECIFICATIONS:

• Typical Harmonic Distortion
  
• Frequency Response
  
• Intermodulation Distortion
  
• Signal To Noise Ratio >90dB (IHF A weighted)
  
• Input Impedance
  
• Input Sensitivity
  
• Slew Rate

Please let me these points. Also suggest an suitable Preamp design for this Amp.
Also guide me if these pre-amp designs suits this amp.

JFET Input High Speed Stereo Preamplifier PCB Mimesis 27 | eBay

Symmetric Complementary J FET Preamplifier JC 2 PCB Stereo | eBay​

Regards,
Samrat

 

[projector]

Better capacitor works here

 

[samratsarkar]

Apex Sir,
Pls reply on the SR 200 SPECS..

 

[apexaudio]

Apex Sir,
Pls reply on the SR 200 SPECS..

I can't, I never made SR200

 

[momon]

my sr-200 very hot,why?

 

[apexaudio]

my sr-200 very hot,why?

Deacrease BIAS current, set 30mA per output.

 

[johndaf]

Hi does anyone have the BOM list for SR200?

 

[momon]

Deacrease BIAS current, set 30mA per output.

thanks mr.mile

 

[didiet78]

I will share schematics of my new amplifiers HD50, HD150 and HD300 with J fets in LTP...

Any time soon ? 🙂

Didiet

 

[apexaudio]

Any time soon ? 🙂

Didiet

Go to thread: http://www.diyaudio.com/forums/solid-state/244892-diamond-differential-amplifier-21.html

 

[sonal kunal]

Hi Mile, I have modify alex mm SR200 pcb with 5 pair output transistors and included protection. Do I have make any correction and will that protection work on SR200?

 

[apexaudio]

Hi Mile, I have modify alex mm SR200 pcb with 5 pair output transistors and included protection. Do I have make any correction and will that protection work on SR200?

You can add zobel network with inductor

 

[sonal kunal]

Thanks, I'll add zobel network. I'll be using your protection based on NE555 which has inductor included. Thanks willy for pcb layout.

 

[apexaudio]

Thanks, I'll add zobel network. I'll be using your protection based on NE555 which has inductor included. Thanks willy for pcb layout.

It is my favorite protect.

 

[didiet78]

Hi Mile, may i ask about A-17 ?
Can you give us info about Zener for Biasing Cascode and VBE on A-17?

Thanks

Didiet

 

[thimios]

sr200

Hi Mile, I have modify alex mm SR200 pcb with 5 pair output transistors and included protection. Do I have make any correction and will that protection work on SR200?

Is on your plan to share this pcb?

 

[sonal kunal]

Here layout of pcb in pdf and sprint layout file.