Studio Reference Amplifier

[mihailo]

Leonatax, you can use BC557,BC556,BC560 and BC546,BC547,BC550. Just dont use BC548/BC558. They are only 30V limit. There are also some 2SC/2SA, that can be used.
Regards

 

[leonatax]

Thanks a lot

 

[mihailo]

2SC1815/2SA1015 can be used instead of BC546/BC556, but look pin position.
Regards

 

[carlmart]

Leonatax, you can use BC557,BC556,BC560 and BC546,BC547,BC550. Just dont use BC548/BC558. They are only 30V limit. There are also some 2SC/2SA, that can be used.

Voltage limit will depend on the position the transistors are in.

For Q1-Q2 you can use better, lower voltage transistors, even dual types if you can find them. Like MAT01 and MAT02.

 

[apexaudio]

There is no any voltage limit for replace BC550/560 transistors. BC550/560 works in cascode 15V is maximum DC voltage for input pair, and only 1,5V in cascode VAS.

 

[carlmart]

There is no any voltage limit for replace BC550/560 transistors. BC550/560 works in cascode 15V is maximum DC voltage for input pair, and only 1,5V in cascode VAS.

Yes, of course. There are 15v zener regulators up and below.

Just curious. Did you try a better regulator to replace the zener ones?

 

[apexaudio]

Yes, of course. There are 15v zener regulators up and below.

Just curious. Did you try a better regulator to replace the zener ones?

No, zener regulators is simple shunt regulators and work good 🙂

 

[apexaudio]

This is my amp from 80', modular drivers and protect pcb only caps is too big to be fit on amplifier motherboard. I considering to use this design for 'Studio Reference Amp'.

I find schematic of this old amp from '80.

 

[leonatax]

injoy my type of pcb

 

[leonatax]

enjoy my pcb

 

[leonatax]

sorry in first zip is a error on 10 om resistor
this is corect

 

[AndrewT]

report your post and ask to have the wrong data removed from the Forum.

 

[apexaudio]

enjoy my pcb

Thank you for your files

 

[apexaudio]

Soft Start with TRIAC for 1000VA transformers.

 

[alex mm]

.......just in time , thank you mr.Mile 🙂

 

[apexaudio]

.......just in time , thank you mr.Mile 🙂

Do you need pcb design 🙂

 

[44250]

Do you need pcb design 🙂

He he he he heeee... 🙂 🙂 🙂 🙂

 

[apexaudio]

Soft Start with TRIAC for 1000VA transformers.

Any 40A triac can be use, like BTA40, BTA41... and TLP3041 can replace MOC3041 or use MOC3040, 3042, 3043, 3061, 3062.
For 500VA use 25A triacs, like BTA140, BTA26, TIC263.
TIC253 (20A), TIC246, BTA16, BT139... (16A) can be use for home amplifiers.

 

[QQ12e5k1]

I find schematic of this old amp from '80.

What type of this amp??
How much power dissipation and rail voltage??

Regards

 

[viki_v2]

Hello Mile,
Sorry for asking this question Again. regarding protect -Does it need 2 Power supplies 15-0-15 and 18-0-18, and how to connect protect with amp.

regards
Viki