component layout helped preserve the tube based color sets

[oldtvman]

After servicing these beasts for a long time, one thing is crystal clear. THE fact that Zenith put all the vacuum tubes on the top of the chassis,helped save the passive components from direct exposure to the heat generated by tubes.

AS compared to the RCA and others like them, the fact that active and passive components accelerated heat wear on the board the components and the wiring.