Sonix 350-d PA/GA power amplifier unit
http://www.coopermedc.com/sites/coopermedc.com/files/products/datasheets/cooper-medc-datasheet-dsso0021enc-350d.pdf
http://www.coopermedc.com/sites/coopermedc.com/files/products/datasheets/cooper-medc-datasheet-dsso0021enc-350d.pdf