Premier Radio 3 valve TRF receiver.

[Geordie McBoyne]

The value of the 0.002mfd coupling capacitor does seem to be on the low side. In fact even with a 0.01mfd capacitor connected across the primary of the output transformer set has too much top response.
Changing the coupling capacitor with one of 0.01mfd will improve the LF response.
A real improvement in the performance has been secured by replacing the 6K7G RF amplifier with an all metal 6K7.
Radio Newcastle on 1458Kc/s was coming in about 230 meters on the tuning scale, readjusting the trimmers on the tuning capacitor has repositioned the station on the scale, just above 200 meters.
Even the 1 watt hospital station Radio Tyneside on 1575Kc/s can be received.

Geordie McBoyne.