Chelvam - you could be right - the hardwood would conduct heat and transfer to air but not as efficiently as metal - if you really wanted to lose heat better if top plate was black and well ventilated- I have actually since changed bottom plate to a sandwich panel of aluminium sheet with foam core due to rack height limits and new tubes but I suspect the hardwood was better - life is too short to AB everything - in any case a stiffer base plate and improved footers help
Cheers,
Cheers,