Studio Reference Amplifier

[apexaudio]

mr mile
i built clip indicator circuit today
it works very well
i want built pp8 preamp
i have 2 question from u
1-can i use 12.0.12 v instead 24.0.24 v?
2-how much is pp8 gain?
View attachment 594588

View attachment 594589

respectfully

Yes you can use +/-12V gain is 6dB
Regards

 

[mprivitera1]

.....schematic for preamplifier with fet , terminal identified ... Sir Mile can tel us if I'm correct .
Alex.

Hi guys,

some of you have built this buffer?

Thanks

 

[mprivitera1]

Hi guys,

some of you have built this buffer?

Thanks

 

[behrad]

Yes you can use +/-12V gain is 6dB
Regards

thanks mr mile
how much is gain in pp12 and p30 preamp??

 

[apexaudio]

thanks mr mile
how much is gain in pp12 and p30 preamp??

You can set gain with different value of feedback resistors, 6-10dB is usual value.
Regards

 

[mprivitera1]

You can set gain with different value of feedback resistors, 6-10dB is usual value.
Regards

hello Apex,

you can drop below 6dB?

 

[apexaudio]

hello Apex,

you can drop below 6dB?

Yes, but better to use buffer if you do not need gain.
Regards

 

[mprivitera1]

Yes, but better to use buffer if you do not need gain.
Regards

OK ,
Thanks

 

[behrad]

mr mile
i set to bios for 16mv in sr100 after an hour
is this enough?


respectfully

 

[herimanana]

HI every one !

how about SR800 ? if not, how about adding more Pairs of 2SC5200/ 2SA194 on SR250 or SR200. For example 5 Pairs of 5200/1943. Will it work well without changing anything ?

 

[herimanana]

SR400

Or as anyone have SR400 circuits ?

 

[Bangla H]

SR60

Any advise needed.
The SR60 (Olaf's) boards are filled with parts.
By viewing to 1837- hfe250-260 and 4793- hfe 220-230wish i have on hand, i feel they're not good matched, or could it work?
Is it necessary to have hfe more closed for better result- offset....?

 

[apexaudio]

Any advise needed.
The SR60 (Olaf's) boards are filled with parts.
By viewing to 1837- hfe250-260 and 4793- hfe 220-230wish i have on hand, i feel they're not good matched, or could it work?
Is it necessary to have hfe more closed for better result- offset....?

It is ok, no need to be matched.
Regards

 

[Bangla H]

Many Thanks Mile.
Than i heat up my solder iron and if all worked some impressions later.
Regards

 

[behrad]

mr mile
in circuit below which one caps are effective for filtrate voltage?
i have 40000uf but I don't know where puts

respectfully

 

[smartx21]

mr mile
in circuit below which one caps are effective for filtrate voltage?
i have 40000uf but I don't know where puts
View attachment 601076
respectfully

Both "1" and "2" are filters.
Place the bigger ones in position "2", but do not remove caps from position "1" (you may use lower value ones, though).

 

[pallab]

Nice work, triac need small heatsink.
Regards

sir,i have on semi MAC228.Can i use MAC228 instead of MAC224 ??

 

[thimios]

Diy file...

What is amplifier's lower power supply voltage when this circuit used?

 

[samratsarkar]

Dear Apex Sir,
I am keen to make SR 200 Amplifier. Please advise whether to go with 4 pair BJT or 3 Pair for my PSU setup. Let me know if I need to change in PSU for this Transformer..
Toroidal - 55-0-55 , 1500 VA, 10 Amps
Capacitor - 60,000 uf / 100 v per channel. ( Total - 1,20,000 uf/ 100 volts)
Speakers - 10 inch Woofer - 8 ohms , 6.5 inch Kevlar Mid ( 8 Ohms) and Silk Dome ( 8 ohms)

Please guide me with suitable PCB link of SR 200 and PSU PCB link.

With Regards,
Samrat

 

[Gusser]

As someone who has worked in the broadcast and mastering industry for 35 years:

Studio quality/standard = what ever the studio decided to buy, nothing more!

Most of what I have seen is Crown and Bryston. But there are countless other brands in use.

QSC seems to be the commercial and color mastering theater amps of choice these days.,

P.S. Nothing against the Apex design. Looks good to me.