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Old 29th May 2005, 05:12 PM   #1
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Default Self Class G. Transistor matching?

Hello,

I am building a system based on the following-

Douglas Self Preamp. PCB by Signal Transfer Company
8 channels of Doug self design Class G amp using PCB's by Signal transfer Company.
Linkwitz Orion speakers with active crossovers.

I have hit a snag, and am hoping someone can advise me.

Do I need to match the transistors on this design. If so, does anyone offer a transistor matching service.

Regards

Andrew
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Old 30th May 2005, 02:04 AM   #2
MGR is offline MGR
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Default Class G amp

I have built the class G amp that Douglas Self designed and as far as my working prototype there was no need to match the transistors.My amp has been working for about 2 years with no problem.I used +- 60 volts dc for the low and +- 120 on the high side.I used toshiba 2SA1943 and 2SC5200 for the outputs.
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Old 30th May 2005, 04:06 PM   #3
K-amps is offline K-amps  United States
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Man how many watts do you get out of that... I am guesssing the trafo's are not tightly regulated otherwise the Toshiba's will not like those rails....
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Old 31st May 2005, 02:12 AM   #4
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I am getting 500 watts at 8ohms ,because of the series connection the output transistor never sees more than 60 volts,the 120 volts dc is without load with load it will drop to 110 volts.It uses 6 NPN and 6 PNP toshiba per channel.
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Old 31st May 2005, 02:55 AM   #5
K-amps is offline K-amps  United States
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Ah, the old totem pole... gotcha... The issue I have with Totem poles is lack of damping factor, at higher volumes, the woofer's cones are out of control... it might be ok in your amp but thats my experience with series OP stages.
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