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April 1959 Popular Electronics[Table of Contents]People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights (if any) are hereby acknowledged.
1 Year Fleming invented diode vacuum tube.
3 This quantity multipled by r.m.s. value of a.c. voltage
will give peak voltage.
6 Slow record player speed.
5 Difference frequency in kilocycles produced by mixing
1000·kc. signal with 50·kc. signal.
9 Quantity by which peak value of a.c. voltage is
multiplied to obtain r.m.s, value.
12 One-half kilowatt expressed in watts.
13 Output frequency in kc. of transmitter having crystal
frequency of 2017.5 kc. and two doubler stages.
14 Lower limit of u.h.f. frequency band expressed in
15 Large-size hi-fi woofer.
17 Very slow record speed.
18 Year tetrode (screen-grid) vacuum tube was
developed. in reverse.
20 Mid frequency in megacycles of TV Channel 6 when
lower frequency limit equals 76 mc.
21 Total resistance of two 44-ohm resistors connected
22 Upper frequency limit in mc .. of super-high-frequency
24 Voltage drop across 20-ohm resistor when current
flow is 10 amperes.
25 Number of feet in 12 yards of hookup wire.
26 Mid frequency of TV Channel 2 when upper channel
frequency limit is 60 mc.
27 Actual filament voltage rating of 6-volt vacuum tubes.
28 Popular-size TV screen.
30 Heater voltage of 35Z5 vacuum tube.
31 Separation in megacycles between TV sound and
video carrier frequencies.
32 Number of zeros represented by letter K in stating
33 Cycles in one megacycle.
34 Total voltage drop in series circuit when applied
voltage equals 50 volts.
1 Degrees of phase shift in voltage fed back to produce
degeneration in amplifier circuit.
2 TV aspect ratio; ratio of picture width to height.
4 Year Lee de Forest invented triode.
5 Voltage drop across 90-ohm resistor when current
flow equals 112 amperes.
7 Tape recorder slow speed in ips.
10 Wavelength in meters of 400-kc. signal.
11 Fast record player speed in rpm (approx.).
14 Electrical degrees in one cycle of alternating signal.
16 In resistor color code, number represented by green,
white and yellow.
17 Year pentode was developed.
19 Electrical degrees in one alternation of sinewave
23 Capacitance reactance of 1.0 ufd. capacitor at
frequency of 60 cps.
24 Express 0.00271 henrys in microhenries.
27 Convert 650,000 watts to kilowatts.
29 Amount of capacitance in farads that will store
100 coulombs of electricity when applied voltage
equals 1.0 volt.
30 This number means "the end."
31 Grade of solder often used in electronics work.