What Size Rack

[Mykesbass]

I have recently bought a 120w valve power amp from Beedster and have just bought SteveBasshead's Peavey valve preamp. 3U and 1U respectively, but how big should the rack be to allow for air circulation and how many units space between the two?

Thanks,
Mike

[flyfisher]

Do they have fans? If so, they probably won't require any space between units.

Otherwise, I'd expect the user manual to give some guidance about rack spacing.

[icastle]

If there are ventilation holes on the top or bottom of the units then you're going to add at least 1U and either make sure it's 'back off when in use' type or, if it's a fixed (or awkward to remove) back you'll need to add a case mounted fan somewhere on the back panel to vent hot air out of the rack.

If there are no ventilation holes then the units will use 'front to back' cooling and space between the units isn't an issue.

When buying a rack I always leave an extra 1U and put a blanking plate in it - you never know if you'll find something else you want to add in a few months time...