Studio Reference Amplifier

[mihailo]

Are these 2K2/2W resistors enough for TL071?
Regards

 

[apexaudio]

Are these 2K2/2W resistors enough for TL071?
Regards

With rail voltage +/-35V 1k/2W can be use instead 2k2/2W.
Regards

 

[mihailo]

Thanks Apex. I'm planing to use transformer with 2x25V~ .
Will put two 2K2/2W resistors in parallel.

 

[shravanth]

I just made ​​SR50 and the sound is great, but the BF's transistor are quite hot when turned on for 5 minutes, is this normal or is there something wrong with the circuit that I created, help me please newbie here

An externally hosted image should be here but it was not working when we last tested it.

hello sir can you mail SR50 pcb layout to shravanth.reddy@yahoo.com plz...

 

[shravanth]

hello apex sir which amp is best quality amplifier at 100w

 

[Nassos]

Hi to all! I decide to built this amp,but I have only 4+4 pieces of 2sc5200/1943.Is that a problem or not? And a voltage rail +- 60V is enough or too much for 150watt?
Any measurements of this amp?
Thanks in advance for the answers!

 

[Vostro]

Hi to all! I decide to built this amp,but I have only 4+4 pieces of 2sc5200/1943.Is that a problem or not? And a voltage rail +- 60V is enough or too much for 150watt?
Any measurements of this amp?
Thanks in advance for the answers!

I'm using SR200 (AlexMM Rev3.1 PCB) with 3Pairs Output (per channel) with no problems at aprox 63Vdc-0-63Vdc.

Or do you mean 2Pairs per Amp (channel) for stereo at 60V ?

This is GREAT amp to build
Regards

 

[Nassos]

I'm using SR200 (AlexMM Rev3.1 PCB) with 3Pairs Output (per channel) with no problems at aprox 63Vdc-0-63Vdc.

Or do you mean 2Pairs per Amp (channel) for stereo at 60V ?

This is GREAT amp to build
Regards

I have a total 4 pcs of 2500 and 4pcs of 1949 instead of 6+6 of SR200...so for a stereo amp I have 2 pcs from each one transistor per chanel...+- 63Volts is ok?

 

[apexaudio]

Hi to all! I decide to built this amp,but I have only 4+4 pieces of 2sc5200/1943.Is that a problem or not? And a voltage rail +- 60V is enough or too much for 150watt?
Any measurements of this amp?
Thanks in advance for the answers!

It's OK with 8R speakers.

 

[ahmadfay]

PCB in progres...

how about the pcb of SR400?

 

[apexaudio]

SR200 in action
Apex SR200 on http://forum.Diyaudioproject.eu - YouTube

 

[Arif Budiyanto]

SR200 in action
Apex SR200 on http://forum.Diyaudioproject.eu - YouTube

Very good!!!
Best Regards,
Arif B.

 

[shravanth]

hello can I use SR200 with 4pairs output

 

[yakusa]

Mr apex,
Im planning to biuld this amp with 3 channels to power my LCR. Will one psu and one transformer be OK? Will a +-40v, 1000va, 12 amp be ok?

Thanks
Alex

 

[apexaudio]

Mr apex,
Im planning to biuld this amp with 3 channels to power my LCR. Will one psu and one transformer be OK? Will a +-40v, 1000va, 12 amp be ok?

Thanks
Alex

Yes, you can use this trafo
Regards

 

[yakusa]

What about the psu? same as the one recomended for stereo?

 

[shravanth]

hello apex sir i have new pcb layout for SR-200 with 4 pairs output according to the circuit diagram from post #1 but it is not working

 

[alex mm]

can you post pic of your new PCB ? I can help you ......

 

[shravanth]

this are my pcb layouts

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[shravanth]

An externally hosted image should be here but it was not working when we last tested it.