Ok, I am trying to build a simple tube set (tube for cosmetical reasons basically) which operates on 12V. I have successfully built the circuit shown and the performance is good in terms of selectivity and with good RF sensitivity as I can listen quite distant SSB stations.
In order to make it more audio amplified I am thinking of "borrowing" the principle of reflex audio feedback, but using the second tube only. The advantage of using a second tube is that you can have positive feedback to the audio amplifier (second tube) and at the same time negative feedback to the RF amplifier.
apart from AGC, all I need is an audio amplifier schematic that will be able to achieve a high gain using feedback loop.
Any thoughts/schematics?