restoring old electronics - tcfrestoring old electronics jonathan allen, ph.d. rf electronics...
TRANSCRIPT
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Restoring Old Electronics
Jonathan Allen, Ph.D.
RF Electronics Consulting
Sarnoff Collection Volunteer
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Radio receivers
Household: AM, FM, both
Short wave & communications
TV receivers
Audio/Hi-Fi equipment
Phonographs
Tuners, AM, FM, both
Preamps, Power amps
(Test Equipment & Lab instruments, Mil. Surplus)
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Vacuum Tubes
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Tube Bases
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RCA 621TS (1946)
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Why Screens Use Diagonal Measure
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RCA TV 621TS Bottom
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621TS Front View
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Rider Service Manual Sample Pages
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Svc. Manual Shows Correct Circuit Voltages
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Basic Tool Kit
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Test Instruments
VOM (Multimeter) or DMM (Manual may specify 20k/v or VTVM)
Oscilloscope
Signal generator
Variac
Isolation transformer (Especially for AC/DC sets)
LCR meter or bridge
Tube tester (The best tube tester is a known-good tube.)
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Tube Tester, Hickok 539B
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Capacitor Leakage Current
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Shrinking ‘Lytics
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Shrinking Paper/Film Caps
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New Caps Under Chassis
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Film Resistor to Replace Carbon Comp.
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Hook Splice
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Hook-Spliced Component & Term Strip
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Caig DeoxIT Contact Cleaner
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General Safety Rules
Tubes operate at hundreds of volts
Ground the chassis
Discharge filter capacitors
Work on wood bench, wood stool.
Keep hands off chassis when probing.
CRTs may implode, esp. old ones w/o safety glass
Use isolation transformer on all AC/DC sets.
Best not to work alone.
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Safety gear
for handling
CRTs
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“All American 5” AC/DC Radio
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“All American 5” Chassis
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AC/DC Hot Chassis Hazard