Since tubes derive a significant amount of cooling via radiation, the black
separator seems to make sense. Does it in fact allow the tubes to run
cooler... who knows, but it probably can't hurt as long as it doesn't
interrupt airflow.
Working this in the reverse, I replaced a transformer in a 32V2, where the
rectifier as I recall is directly adjacent the (black) power transformer.
The transformer got very warm during operation. I put a thin Al sheet in
between the transformer and the tube and the transformer was notably
cooler (Tubes being cheaper than transformers to replace).
Merry Christmas All
John
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