Latest Restorations

Admiral

10A1

Farnsworth

GP-350

Zenith

6-S-632

Scott

Philharmonic

Philco

40-180

RCA

110K

Zenith

10A1

Zenith

5G40

Hallicrafters

S20R

Zenith

R-1116

RCA

7S-529

Zenith

77U

Zenith

7-S-232

Hallicrafters

SX-42

Philco

645

Arvin

3586

Philco

47-1230

Grundig

97

Grundig

5088

Chevrolet

986669

Mitchell

1274

Crosley

637

Arvin

780TFM

Grundig

3587

Zenith

10S669

Philco

53-956

Philco

PT-2

Bush

VHF64

The top photo shows our mostly vintage repair bench.  We enjoy repairing vintage test equipment as much as repairing radios. On the extreme left of the photo is our trusty HP 8645B, the best RF signal generator available for servicing AM, FM and shortwave receivers.

 

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