Trying to obtain a voltage gain equal to 3 without an op-amp
A darlington bipolar, to have high input resistance so your Wein circuit remains on frequency, with 1Kohm in  the emitter and 3K ohm in the collector, will provide approximately 3X gain.
Then follow that with an emitter follower to handle some loads.
You will need to &quot;adjust the gain&quot;, likely in real time with an Automatic Level Control.