Cascode Valve Amp

Here is a valve (electron tube) based Cascode RF pre-amplifier.
The circuit design is basically from Shortwave Cascode Preselector (WU2D)

I have utilized the same circuit as referenced, but with the following changes:
A 6n16b small wire ended Soviet twin-triode is used (see spec's below)
To make the unit portable a 5 cell Ni-cad batery is used as a power source.
5 series'd Sub-C cells 2,200mAH capacity.
The nominal 6 volt battery supplies both the valve filament and also a DC-DC inverter
which is needed to supply 220V for the valve anode circuit.
The inverter is the same unit as described here:
From the Serviceman Who Tells - (Nr4) Solid State Vibrator upgrade for old radios
A small digital voltmeter is fitted to show battery voltage.
Battery life is definitely limited by current drain which is 450mA approx