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20th June 2011, 01:51 AM
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diyAudio Member
Join Date: Jun 2008
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The only mod or fix that I know of is to bypass one of the diodes in the bias circuit with resistor (22 Ohms, I think). This was a fix from Heathkit to prevent thermal runaway on some units. My AA1640 isn't modded and doesn't have the problem. Google it to make sure of the details. Other than that I haven't seen anything else.
Craig |
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Heathkit AA 1640 mods
