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That Schematic is old.
It has no dual finals in it, more likely a single IRF520, on a board that was intended for Two IRF520`s
It is just a bad deal, whoever sold you the amp should have know better than to sell you a 1x4.

If it was me....I would undo the Mod on the radio, sell the 667V, and put the money towards the 6 or 8 transistor biased amp.
That`s me.
I would not run a radio with 2 2290`s into 4 2879`s, again, that is just my opinion.

[QUOTE="AudioShockwav, post: 438119, member: 6"] That Schematic is old. It has no dual finals in it, more likely a single IRF520, on a board that was intended for Two IRF520`s It is just a bad deal, whoever sold you the amp should have know better than to sell you a 1x4. If it was me....I would undo the Mod on the radio, sell the 667V, and put the money towards the 6 or 8 transistor biased amp. That`s me. I would not run a radio with 2 2290`s into 4 2879`s, again, that is just my opinion. [/QUOTE]

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