Update on the 30m Grabber Receiver

OK, the grabber receiver is now receiving successfully since months, I will therefore not change it. Should I build it from scratch now, I would replace the transistor audio stage with one that employs a low noise operational amplifier. In a similar design to the grabber receiver, the 30m Polyakov I/Q-SDR receiver, I used a TL082 dual opamp, needed two channels... I figure a TL081 will do fine for a single channel.
Note, the schematics does not show the supply and ground connections to the op-amp.