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Old 30th August 2004, 10:17 PM   #1
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Default stage accompany ppa-1200 amp

hello
i wonder if anyone use or know this amp.
i need its schematic to set the bias correctly..one of the amps warms 3 deg more then the other and i want to fix it.
i will really appreciates any help.
good day
David.
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Old 7th September 2004, 10:54 PM   #2
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If setting the bias is all, you don't need a scematic. Just turn the bias pot so that the outputs are in cuttoff, then measure the voltage across the emitter resistor, 0.1-0.5Ohms. tweak the pot until you see voltage begen to develope accross the resistor. This is where you want to bias. Disconnect one of the output collectors, and insert an ammeter to be sure.
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Old 7th September 2004, 11:56 PM   #3
OliverD is offline OliverD  Germany
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Default Re: stage accompany pps-1200 amp

Quote:
one of the amps warms 3 deg more then the other
Do you think this is a problem? I wouldn't bother to mess with it.
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Old 17th September 2004, 03:09 PM   #4
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Default thank you both

yes. i think that is the problem.
i didnt see a bias pot thats why i want the schematic..
have a great day!
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Old 2nd June 2008, 07:03 PM   #5
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Anyone got a schematic for Stage Accompany power amp? This is an older unit, blue casing, 2 toroid power transformer, has 16 pair of 2SC5200 per channel. Blown up, some resistors are burnt.
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Old 2nd June 2008, 08:43 PM   #6
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Quote:
Originally posted by lumanauw
Anyone got a schematic for Stage Accompany power amp? This is an older unit, blue casing, 2 toroid power transformer, has 16 pair of 2SC5200 per channel. Blown up, some resistors are burnt.

I suspect the bias is set using set resistor values after they had a pot in the prototype.

I wouldnt bother for 3 degrees either unless the 3 degrees is 3 degrees above 120 degrees C !

It will be quite a bit of hassle to set the bias plus you might make a mistake and blow the output transistors.

Is it really worth the hassle ?

The last time I set up a bias I blew 6 MOSFETS and it cost me around £15 to replace them.......
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Old 3rd June 2008, 02:00 AM   #7
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My problem is different than dud_wity 's (thread starter).

I wanted to repair a blown SA power amp due to overdrive (not the bias problem).

Anybody got SA schematic or service manual?
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Old 3rd June 2008, 06:43 AM   #8
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www.sa-vintage.com
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Old 3rd June 2008, 05:04 PM   #9
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Thanks, Jacco
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Old 5th June 2008, 03:07 PM   #10
Webbie is offline Webbie  Netherlands
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Hello David,

The complete PPA 1200 service manual is on his way to me.
I will place it on my site as soon as possible:

www.sa-vintage.com

Also this week on my site:

- Service Manual PPE 2410
- Service Manual Sa 1600/800
- User Manual ES20
- PlexiGlas SA Blue Box foto's from the showroom in Hoorn
- and over 60 scans of SA Product Information


Greetz Webbie...
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