Strange FETs

Today I spent some time breaking apart some TV transmitters. I was looking for power transistors. Opened one very strange module with heavy heat-sinks. This is the photo of transistors I found inside:

Gallium Arsenide power fets

It is Russian made Gallium Arsenide power FET transistor mounted on heat-sink. Also some filters made on ceramics. Very nice and useless stuff unless your are making some ultra-high frequency transmitter (~3GHz). The prints on transistor are:

3П610Б-2, 3П910А-2, 3П910Б-2.

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