This is the cover of the leaflet
Nearly all the aerodyne models of the time
were named after birds. The 'Merlin', pictured here, is typical of the design
styling. Very Art-Deco in Walnut veneered ply with contrasting cross-bandings
and boasting a chrome-finish clock, this was a three valve battery TRF set with
medium and long wavebands on the illuminated dial. Typically, the basic cabinet is a simple
rectangular design, using stepped 'Deco' shaping to the feet and the inlays to
help prevent visual monotony.
For more about this set, click the 'Merlin'
"MAINS PERFORMANCE FROM THIS MODEL. This is a
4-valve class 'B' battery receiver. Class 'B' is a new development in battery
sets, giving 'MAINS' results from an ordinary HT battery.
It is a circuit arrangement that enables a battery set
built on the principle to handle enormous output without a trace of distortion
with normal HT consumption.
This receiver is up-to-date in everything. Band-pass
input, variable Mu HF stage, power grid detector, Class 'B' output, permanent
magnet moving coil speaker, housed in a beautiful Walnut cabinet with Rosewood
inlay. This latest Aerodyne achievement gives an output of 1,300 milliwatts with
an economical HT consumption."
= British Valve Association. A trade cartel primarily designed to
ring the prices of valves and keep them artificially high by removing
competition within the trade.
Power Grid Detector
= this is leaky-grid detection but using rather
smaller values of both grid resistor and grid capacitor than the 'conventional'
method. It uses a much higher anode voltage and for that reason is mostly found
in AC mains (indirectly heated) valve circuits. The advantage is a virtually
distortion-free detection process.
Class 'B' = a form of push-pull AF output stage in which a special
double valve is used instead of two separate valves. A driver (phase splitter)
valve is still needed, of course. Used in battery designs to produce large
values of low distortion output.