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Old 21st May 2012, 03:09 PM   #1
diyAudio Member
Join Date: Oct 2009
Default 250W Simple Power Amp Project ??

Hi everyone,

I need to upgrade an aging Yamaha P2250 Power amp with something I can build myself. It is being used as a PA amp for a small church. I own an Adcom GFA-535 and absolutely love the sound, and am looking to build something like the equivalent of the beefier GFA-555.

Any suggestions??

I have the service manual with schmatics for the GFA-555 (mk i), and I am wondering about recreating a clone of it, as the circuitry is fairly straightforward. Etching pcbs is no problem for me.

Anyone have any comments?
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Old 21st May 2012, 03:16 PM   #2
Join Date: Jan 2005
Cloning an amp is easy, but cloning the way it sounds is near impossible as you cannot get the exact same part the original used.
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Old 21st May 2012, 04:56 PM   #3
diyAudio Member
Join Date: Nov 2004
Location: Germany
On paper, the P2250 seems like a pretty decent amp at the very least. What's wrong with it?
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