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What substitutes are you using for J49/K134?
What substitutes are you using for J49/K134?
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Old 13th September 2010, 04:09 PM   #11
kcollins is offline kcollins  United States
diyAudio Member
Join Date: Jun 2005
Location: Los Angles, CA
In my experience, Exicons are not exact replacements for the Hitachi lateral Mosfets in certain circuits (e.g. Hafler).

While sometimes they can be made to work, many times chages to compensation, bypassing, and / or gate resistors are necessay to ensure stability.

In at least one instance, I was unable to prevent oscillation in a Hafler DH200 regardless of heroic efforts to stabilize the amp. Exchanging the Exicons for Hitachi's cured the problem.

If you want true drop in replacements, stick with the Hitachi's.
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