Head cab, inside clearance for tubes

[VintageKnob]

I'm building my first cab of any type, starting with a simple one for my 18 watt chassis. How much top clearance would you suggest above the recto and power tubes?

Thanks,

Don

[SatelliteAmps]

2 inches.

[VintageKnob]

Cool, thanks. I wouldn't have given it that much. I'll take your word for it. :AOK

EL84's run pretty hot.

Thanks,

Don