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Old 23rd July 2003, 03:11 PM   #1
diyAudio Member
Join Date: Jul 2003
Location: Newcastle, Australia
Default ETI 480 power upgrade

Although mainly of interest to Australian / New Zealanders, may be of use to others.

I had a bit of interest to a post in the Speakers forum regarding increasing the power of this popular magazine project amp, so am posting the schematic I used.

Orginal amp (with 2 pairs of output transistors option) would push about 100W into 4ohms. This modification boosts that to 200W at 4ohms and adds a bit of protection to the outputs as well.

Note that the supply voltage is increased from the original +-40V - this is acheived with a 35-0-35V transformer.

Please compare to the original circuit (posted in another thread).

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