A double conversion receiver designed for SSB reception has a beat frequency oscillator and:

A 'double conversion' receiver is designed to convert the incoming radio frequency twice before it reaches the detector stage. To achieve each frequency conversion, the receiver requires a dedicated mixer and a dedicated local oscillator. Because there are two distinct frequency conversions, the receiver architecture must include a first intermediate frequency (IF) stage and a second IF stage, each fed by its own local oscillator. This means the system requires a total of two IF stages and two local oscillators. The beat frequency oscillator (BFO) mentioned in the prompt is an additional oscillator used at the very end of the signal chain to demodulate SSB or CW signals, and it does not count as one of the conversion oscillators.