50W HF amplifier

This is an enclosure for an amplifier for amateur radio. It is part of a comprehensive project covering all major aspects of an efficient DIY design, leading to a minimalistic, but field deployable device. Its main characteristics are:

* 30 to 50 W output
* 2 to 2,5 W input
* 12 V to 14 V supply
* Works 40 m to 20 m bands, expandable
* Harmonics Suppression via LPF
* PTT (active low)
* Passive cooling, ready for active venting
* Time required for building: 6 to 8 h
* Total hardware co