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“Vintage Radio Alignment -From Scratch” Book by Richard (Dick) Whipple |
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The popularity of repairing and
restoring vintage tube radios has highlighted the need for a variety of test
instruments. A voltmeter and signal generator are essential for
troubleshooting. A wide-band oscilloscope comes in handy at times for
tracing signals in radio frequency and audio circuits. After repairing
or restoring a vintage radio, the final step is often alignment. For AM
radios, a signal generator and voltmeter usually give good results. But
for FM radios, signal generator/voltmeter alignment does not always prove
satisfactory. In this book, I present the theory and practice of AM and
FM alignment both using a signal generator/voltmeter and a sweep
generator/oscilloscope. Because obtaining a sweep generator is not
inexpensive or easy, I also include instructions on how to build and operate
the “WhippleWay Sweep Alignment Board” or WSAB for short. It
incorporates both sweep generator and oscilloscope into a single unit.
Because of their popularity, our focus is on “tabletop” radios rather
than “console” radios. The former includes All-American-Five designs
that make up most of the vintage tabletop radios still around today.
The latter are large, floor-standing models with additional stages and
more complex circuitry. Though not covered explicitly, most alignment
procedures covered apply equally well to console models or can be readily
adapted to do so. Order from Amazon by clicking here or using ASIN number: B0933KLP5W. |
