If I remember correctly, the Ref 6 manual says 6-8 inches of clearance. Also the Ref 3 Phono.
The Ref 10 and Ref 10 Phono manuals says 8-10 inches of clearance.
The Ref 5/SE manuals: While the Reference 5 does not dissipate an unusual amount of heat, it is important that it be provided with reasonable airflow to assure long, trouble-free operation.
The Ref 2/SE manuals may say it best: Operation of vacuum tube equipment for long periods of time in hot ambient air will shorten tube life and increase chance of failure of other component parts.
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