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One of the main concerns was the excessive heat generated by certain transformers and tubes, particularly the 5Y3 dual diode tube and associated components. To mitigate this, they constructed a custom heat venting chimney with ventilation underneath, designed to suck away hot air and keep critical components cool. They mention that the 5Y3 tube was located too close to sensitive areas, which could potentially lead to damage, prompting the installation of additional heat sinks and side plates to enhance cooling.