Latest Restorations

Zenith

5S-127

Philco

42-380

Firestone

4-A-31

GE

J-805

Philco

40-180

Atwater Kent

725

National

60

Philco

42-1226

Zenith

G8005YTZ

Crosley

Cord

Continental

8U

RCA

6T2

Zenith

H-500

Hallicrafters

S-120

RCA

16X13

Silvertone

101 660 1A

Philco

42-1226

Majestic

90

Jewel

910

Atwater Kent

40

Arvin

732

Truetone

D2642

Magnavox

R307

Firestone

4-A-22

GE

K58

Crosley

285

Delco (Packard)

6D-621

Zenith

6-S-223

The top photo shows our mostly vintage repair bench.  We enjoy repairing test equipment as much as repairing radios

 

The next photo is of our Western Electric KS-15750L1 tube tester made by Hickok, arguably the finest tube tester ever manufactured.

 

 

 

 

 

Here is an Atwater Kent Model 92, an eight-tube AM radio manufactured in 1932.  The cabinet is exceptionally attractive.

 

The oscilloscope shots that follow show a 1200 kHz AM signal reproduced by the radio.  The shots show how a radio signal is transformed in to an audio signal

 

 

 

1200 kHz signal at the antenna terminal. The signal consists of a carrier wave modulated by intelligence (sound)

 

 

 

The same signal at the grid of the mixer tube.  The signal gained some amplification passing through the antenna coil

 

 

 

Signal has been mixed with the local oscillator to create a 455 kHz signal, the intermediate frequency of this radio

 

 

 

Signal after passing through the second detector.  The carrier signal has been removed leaving only the audio signal

 

 

 

Final amplification stage of the signal readying it for the speaker coil and your ears

 

 

 

 

 

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