Svetlana Y644 is a compact metal/ceramic radial beam tetrode with a plate dissipation
rating of 250 watts with forced-air cooling. The T644 is intended for Class
AB SSB linear RF amplifier service. It is intended for stationary and mobile
equipment designs with power amplification at frequencies up to 500MHz. The
Y644 has an indirectly heated oxide cathode which operates at a low temperature
at rated heater voltage for extended life.
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