| This amplifier is based on Motorola's Engineering Bulletin, EB104, and delivers 600W across the HF band. It uses four MRF150 FETs in parallel, and requires 50V DC at about 0.8A (since we are pulsing it - CW operation requires about 20A!) Each FET is individually biased (the blue pots), and a copper heat spreader was used to aid in heat dissipation. This amplifier is mounted on a large external heatsink. |
| This is part of a 600W Power amplifier at the output stage. The PCB was totally burnt through, and a bypass capacitor turned to dust. You can see one of the remaining legs in the lower right photo. Surprisingly, the ferrite bead was not affected at all. Don't ask what happened - we were at lunch! |
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