Tube Radio Australia

ARR-15 Restoration Project

This set was a bit of a mess and I wanted to get her looking pristine, It was an Ebay Special and came as they usually do with no Power Supply.
I had to build a power supply to match the set. This Radio was the victim of years of living in a garage somewhere so it was full of dirt and badly banged up.
I spent many hours removing components for the motor drive section, cleaning them and eventually I managed to get all of the mechanical components working.
The main issues were, a few shorted capacitors and an open IF coil this was discovered after comparing the set to another ARR-15 my mate had in his Pending pile, It is also progressing,

Without another replacement I had to rewind to old one ….! Lots of Fun..

The Front View before Restoration.     Another ARR-15 Untouched.

     

     Front after re-spray and before silk screening.      Assembled and running.   

 

   Note ! Case and Front re-done (GRIN).      Inside Top.

    

Diagrams and Technical Specifications.


Diagram part 1

Diagram part 2

Diagram part 3

Specifications

There was a lot of work was needed on this receiver.
I replaced a few resistors and capacitors and had to rewind an IF coil as it was open, note that the IF coils are variable and adjustable from the front panel on this type of receiver.
I ran through the alignment and the receiver is well within spec.

At my location (Sydney Australia) a strong WWV was heard on 10 MHz, not bad on a 12 Inch wire antenna.

The Radio Set AN/ARR-15 R-105 has been designed for installation in all type of Naval aircraft. The purpose of the equipment is to provide reliable, preset, multi-channel, voice, cw, and mcw, pilot or radio operator controlled reception. The audio output is consistent at 500 milliwatts maximum with AVC and noise limiter action. With r-f inputs of 10 to 10,000 microvolts, 30 per cent modulated, the output will contain 15% or less distorsion. The audio response does not vary more than plus or minus three db relative to the response at 1000 cps for modulation frequencies of 300 to 3500cps. The maximum attenuation is attained below 300 cps and above 3500cps. The low pass filter provided for cw reception is down 30db or more at 1600 cps from 1200 cps reference frequency and within three db from 1200 cps to 300 cps. Voice, cw or mcw signals may be received with this equipment.

A control on the front panel of the receiver permits the selection of the type of reception. This control is designated CW-MCW-CAL and should be operated to the MCW-CAL position when it is desired to receive voice or mcw signals. When voice modulated or mcw reception is selected, the beat frequency oscillator circuit is disabled, the AVC circuit is connected so as to be operative and a variable "T" pad is used to control the input to the headphones. If cw reception is selected, the AVC is partially disabled, the "T" pad is disconnected from the audio output circuit, and a potentiometer connected in the cathode circuit of the r-f amplifier and first and second i-f amplifier tube circuits, is used to control the gain. Both "T" pad and potentiometer are operated by the volume control. The equipment is designed to operate at temperatures within range of -40C to +60C. This equipment will operate satisfactory up to an altitude of 40,000 feet above sea level.

Associated radio transmitter ATC, AN/ART-13, or equal. Used in A-3A, RC-121, P-2, Z-1, R-6D-1, ZPK.

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