need amp for PSU +/-70VDC

opor · 9th November 2005, 07:33 AM

Hello,

I have PSU +/-70VDC 1.4KVA and many Toshiba power out put device,2SA1943/2SC5200. I am looking for good dual chanel amplifier for my PA system.
Please advise.

Thank you

quasi · 9th November 2005, 08:02 AM

Quote:

Originally posted by opor
Hello,

I have PSU +/-70VDC 1.4KVA and many Toshiba power out put device,2SA1943/2SC5200. I am looking for good dual chanel amplifier for my PA system.
Please advise.

Thank you

Go to Google and search for "Studio 350" Follow the first two links.

By all accounts this amp is excellent. Your transistors are not as strong as the ones in the article so you will need to run extra in parallel. No changes are required for the rest of the cct and you could even use the existing layouts.

Cheers

Upupa Epops · 9th November 2005, 08:27 AM

Very nice kit, Quasi...

AndrewT · 9th November 2005, 07:58 PM

Hi Opor,
I concur with quasi, 2sa1943/c5200 are not too good at higher voltages.
I did some numbers for ClassA Leach thread which gave

Quote:

Some calcs gave the following
4 pairs MJL21193/4 running on 70degC sink can drive 100W into 8ohms (Tc max=92degC). Similarly 8 pairs 2sa1943/c5200.
If you want to run 6 pairs 2sa1943/5200 the sink must be kept down to 55degC (Tc max=75degC).

If you run +-70Vdc rails the SOAR problem gets even worse.
Multiple pairs will substantially overcome the fragility problem but then starts to get in the road of clean signal processing according to some contributors.

bigpanda · 9th November 2005, 11:29 PM

Have a look at this :

http://users.otenet.gr/~athsam/power_amp_300w.htm

I happen to have pcb for it.

BlacK_Chicken · 10th November 2005, 03:47 PM

Hello

If you happen to have a PCB for this amp, wich I do search for a long time now. Could you please share it with me??

Thank you very much!

Greetings

9th November 2005, 07:33 AM	#1
opor diyAudio Member Join Date: Nov 2005	need amp for PSU +/-70VDC Hello, I have PSU +/-70VDC 1.4KVA and many Toshiba power out put device,2SA1943/2SC5200. I am looking for good dual chanel amplifier for my PA system. Please advise. Thank you

10th November 2005, 03:47 PM	#6
BlacK_Chicken diyAudio Member Join Date: Nov 2005	300W amp PCB Hello If you happen to have a PCB for this amp, wich I do search for a long time now. Could you please share it with me?? Thank you very much! Greetings

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9th November 2005, 08:27 AM	#3
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Very nice kit, Quasi...

9th November 2005, 11:29 PM	#5
bigpanda diyAudio Member Join Date: Jun 2004 Location: HKSAR	Have a look at this : http://users.otenet.gr/~athsam/power_amp_300w.htm I happen to have pcb for it.

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