Studio Reference Amplifier

[still4given]

Most studios buy Bryston for the warranty. Neither Bryston or Crown have anything to do with DIY. No studio is going to build their own amp. The SR200 sounds every bit as good as the formentioned amps.

 

[prasi]

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

missed your post...if i remember correctly, mr. mile mentioned that it requires 10v of dc on the o/p to fire...

 

[thimios]

Hi prasi,i think that isn`t suitable for low voltage power supplys

 

[Gusser]

Most studios buy Bryston for the warranty. Neither Bryston or Crown have anything to do with DIY. No studio is going to build their own amp. The SR200 sounds every bit as good as the formentioned amps.

Capital did, well in 1968

 

[samratsarkar]

Apex Sir,
Please let me know if the PSU for SR 200 will work fine with 55-0-55 , 10 amp , 1.5 kva transformer.

 

[isidore kanerusine]

hi guys, I have a few questions on SR200,
1. Is there any need for a preamp on this amp, if so, which one is best?
2. does it require a fan?
3. what is the bias current?
or if you can refer me to any thread that can answer these questions.

kind regards.

 

[viki_v2]

Hello Miles.
I am having difficulty finding your pcb design for regulated PSu with protect, can you kindly guide me to it.

 

[pinnocchio]

Hi All,

I've got 7 bare PCBs of the Apex P30ZF amplifier left over, designed by Alexmm. I'll let go a stereo set (2 PCBs) for 15$ plus shipping

They have plated through holes and white solder mask with black silkscreen. According to Miles it is his best preamplifier.

First come first served. Alex, I'm shipping you your PCBs, sorry for the wait.

Thanks
Do

 

[alex mm]

Hi All,
Alex, I'm shipping you your PCBs, sorry for the wait.

Thanks
Do

Thank you Do !
Regards Alex

 

[donovas]

http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-2.html#post2305431

Hello mr miles.

Im trying to use this psu with 18v dc supply, and also wanting to use bd139/140 in place of 241/242. What needs to change in the circuit?
Thanks in advance

 

[prasi]

http://www.diyaudio.com/forums/solid-state/173462-studio-reference-amplifier-2.html#post2305431

Hello mr miles.

Im trying to use this psu with 18v dc supply, and also wanting to use bd139/140 in place of 241/242. What needs to change in the circuit?
Thanks in advance

What is the purpose? For preamp?

 

[donovas]

F5 headamp. The current draw is high

 

[prasi]

F5 headamp. The current draw is high

May be apex a class PSU for prwamps might be suitable.
Just search.
Reg
Prasi

 

[prasi]

May be apex a class PSU for prwamps might be suitable.
Just search.
Reg
Prasi

Here it is http://www.diyaudio.com/forums/power-supplies/164365-class-preamp-psu.html#post2140391

Mr. Mile can confirm if its suitable

 

[donovas]

thanks prasi. but i already built the psu5

fewer part count was the appeal.

now waiting to find out what can be done with bd139/140

 

[donovas]

I found tip31/32, the regulator works but the v drop is too much. Input voltage 19v dc and max output 8v. How do i adjust the circuit to work with lower voltage?

 

[AndrewT]

change the transformer to a lower voltage. That will lower the PSU input voltage.

 

[donovas]

i mean changing the circuit to work with a lower v transformer. something is not biasing properly or not turning on because i get 8v dc max on the output with only 1.5v ish adjustment range.

 

[donovas]

oops, input voltage is 17. so im getting 9v dropout with this regulator

 

[donovas]

i changed the zeners to led and this allowed me to bring the voltage up to 9.5v.

still 7.5v dropout...