Tube Radio Australia
AWA Argosy Restoration Project

This was a Dumpster fugetive from an old RAAF base in Nowra.
Also known as the AWA CR-3D "ARGOSY" 3C95150

General Description

The Argosy or CR-3D was manufactured by AWA in 1957.
It is an AM/CW communications receiver that incorporated a Turret Tuning Drum for band changes and this units was used on ships and land stations.
The "Argosy" name was used in AWA ship installations and the CR-3D ident was used in land applications.
The Overseas Telecommunications Commission (Australia) used these receivers in marine operations.
There appear to be a few changes later in the run IE: the S Meter and also Aluminium covers for the front pannel.
The unit I have is a early unit SN 125 and has the lettering embossed on the frant metal work.

Technical Details

The set is a 14+2 valve superhet covering the range 14kHz to 30.1mHz in twelve bands.
It features variable selectivity and employes a very interesting selectivity systems using coils and capacitors that are factory set and the coils sealed.
The receiver has two headphone jacks and a speaker build into the power supply.
Later receivers includ a test lead which can be moved between internal sockets, to monitor readings on the front panel meter.
My set does not appear to have this feature.

Aparently there were two power supplies avaliable, one working from 120/240v as in the pictures,
the other from 24v DC.
The all up weight of the receiver with mains power supply is a staggering 100lbs.

The valve line up is:

6BA6 1st RF
6BA6 2nd IF
ECH81 2nd Mixer/Osc
6BA6 2nd RF
6AU6 3rd IF
ECH81 BFO/Buffer Amp
ECH81 1st Mixer/Osc
6AL5 Det/AN
6AU6 AGC Amp
6AM6 Xtal Osc
6AU6 1st AF Amp
6AL5 AGC Rectifier
6BA6 1st IF
6C4 2nd AF Amp
The mains power supply contains 5Y3 Rectifier and OC3/VR105 voltage regulator.

The IF frequencies are as follows.
85kHz on bands 2 and 3
(100-630kHz) On the remaining bands.

The receiver is double conversion, with a first IF of 585kHz and a 2nd IF of 85 kHz.
There is no provision for 6 xtal locked channels on my set, later sets have this provision and use D style holders 30pf shunt capacitance // 0-60 degrees C.
(Xtal Freq=Signal Freq+585kHz with fundamental xtals.)

Sensitivity figures are quoted at 14-50kHz 30uv, 50-110kHz 10uv, 110-240 kHz 5uv, 240kHz-4.0mHz 3uv, 4.0-30.1mHz 1uv, all at 3db s/n.
My set fell well within these specs and looked to be unused prior to being salvaged.

While being relatively old the receiver would be capable of excellent performance on AM and CW.
In its existing form it is not provided with a product detector for SSB reception.

     Final Finished Radio.

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