Studio Reference Amplifier

[vargasmongo3435]

I'm gonna stop here, no more post from me
"I'm just a diy member" please go back a few pages and read like I did a few years ago



cheers !

 

[Sunny22g]

what is studio reference amplifier? eh . what is the difference between normal amp vs studio amp :/

Hifi0101 Best Amp is Apex sr200.Sound is very very sweet.Like chocolate.

 

[HIFI0101]

LOL xD like Chocolate.. sticky

 

[Sunny22g]

Can I use BC 550 BC 560 replace with bc547. Bc557 .Or other options for better performance .Sr200

 

[Sunny22g]

Sr200

Hello guys plz check this. Is that OK or not (sr200)

 

[Sunny22g]

Sir mile plz check is that OK or not

 

[vargasmongo3435]

go with 26mV Mr. Stuart already mention that is the optimum setting for bias



Best Regards
Juan

 

[steveu]

Hello guys plz check this. Is that OK or not (sr200)

That looks like 230mV (0.23V) , about 10x what others have suggested and will mean the amp runs quite warm.
Assuming all is as expected, the meter should read 0.026 or 26.0 two meter setting down, ie on the 200mV scale.

You may prefer the sound overbiased but it runs the risk of overheating.

 

[vargasmongo3435]

yes I didn't notice 230mV is way too hot bias

 

[Sunny22g]

Juan sir I change 2 .1st 1k resistor to 1k5 and 10k trumpet got 57 milvolt .2nd when I pause music then hum coming..After when I play music then hum lvl is low

 

[vargasmongo3435]

did you add the GND wire from the power supply is not connected the negative input sound like a GND problem

 

[Sunny22g]

Sir I am uploading my pic amp.my ac is 45 0 45.8 amp

 

[Sunny22g]

I am not using protection..And when I use 1 k preset after I short input then mm say 230 mv .After I use 2k .Then I short input but no reading .When I open input then say reading 45mv.after I use 10k pot I got 55mv.

 

[Sunny22g]

Sir please help me about this .Sir mile plzz

 

[Sunny22g]

Sr200

Here is layout

 

[Sunny22g]

Sir miles plzz help me

 

[Sunny22g]

Can some 1 help me .To set this bais .

 

[Sunny22g]

1st 2 pictures is inputshort .And 2nd open input.but I pause music then amp say terrible sound (burrrrrr)..I attach PSU ground with input grd wire.(I wate lot of money and time) I hope some 1 help me

 

[Sunny22g]

At last my amp working fine after many trouble.but it sounds like 30 -40 watt not 200 watt.

 

[Sunny22g]

At last my sr200 working fine after many trouble. But its sounds like 30 -40 watt not 200 watt. I check it so many times but no error found on the PCB. I m just rookie in this field. So plz help me. I spent two week on it, I think time is most value able think