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AERODYNE CURLEW,  DRAKE  MAKES OF SET  BLACKBIRD  SWALLOW  CURLEW  MERLIN  EPITAPH

 

CURLEW

Another design in the 'Deco' style, with banding and contrasting inlay, trying hard to disguise the plain box of the cabinet.

"With the advent of universal valves, a new era opens for many thousands whose electric supply mains are DC but may be changed to AC in the future.

In the Aerodyne 'Curlew' full advantage has been taken of these new valve features and of the latest developments in circuit research, resulting in a receiver of outstanding merit. The sensitivity is as good as any superheterodyne and the selectivity is ample. The output on either AC or DC is more than sufficient for most needs, and the quality of reproduction is up to the usual high standards set by Aerodyne."

 


Terminology explained

Band-pass input = a tuning system using several loosely-coupled tuning coils, intended to minimise the losses due to more basic designs. In practice, however, the advantages of the band-pass system are more theoretical than actual, as the bandwidth of the average receiver had to be kept down to 9khz or selectivity suffered.

Energised moving coil speaker = these loudspeakers were energised from the mains via a field winding. Current through this winding created the necessary magnetic field, unlike the permanent magnet type.

DRAKE

"REAL QUALITY FROM THE MAINS"

"The aerodyne 'Drake' takes the place of last year's tremendously popular 'Swan' and embodies all the improvements in circuit and valve research which have arisen during the past twelve months.

These improvements result in greater sensitivity, greater selectivity, and better reproduction. What this means will only be really apparent to those who knew the 'swan' and to those denied this privilege we say with conviction that it has no equal.

You will enjoy as you have never done before your radio with the new aerodyne receiver, which has been built with meticulous care to operate satisfactorily under the altered conditions arising from the Lucerne plan."


Terminology explained

Variable Mu = A screen grid or pentode valve in which the control grid has a special construction with differential spacing of the turns of the grid wire. In practice, varying the bias on such a valve allows control of gain. This was commonly used as volume control is TRF sets such as this, but the vari-mu valve came into its own when used in the superheterodyne type, where its easily variable gain could be adapted to automatic volume control purposes.

Illuminated wavelength scale = note that no station names are given. As stations at the time had a tendency to be shifted about in order to comply with the latest 'plan', Aerodyne obviously felt this tend would continue and that 'named' scales would rapidly become obsolete. In fact, the Lucerne plan of 1934 was the last major change for many years.

AC mains only = this set had a transformer to supply power to its rectifier valve. Transformers only work with alternating current - AC.

 

 

 

 

 

 

 

VINTAGE RADIO world: SIXTEEN YEARS OF WEB PRESENCE