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New Tubes & Semiconductors
SILICON DIODES
Eight new bonded silicon diodes with
peak inverse voltage ratings from 15 v.
to 225 v. has been announced. Types
1N300A, 1N301A, 1N302A, 1N303A,
1N432A, 1N433A, 1N434Á, and 1N460A
TWIN -TRIODES
A 9 -pin miniature tube, the 6BS8, has
higher gain, lower noise and a 20 percent
lower dissipation factor resulting
in extended operating life. 6BS8 replaces
the 6BZ7 or 6BQ7 -A, and will
DOUBLE- TRIODE TUBE
The 12AD7 double triode, a 9 -pin
miniature tube, fills the need for a low -
hum preamplifier in audio applications.
Established tube ratings of the 12AD7
assure an extremely low hum level-
are similar to units not designated "A"
but have higher forward current ratings
with no increase in reverse current.
All types operate at ambient
temperatures from -55 °C to +150 °C
with excellent stability and low reverse
current. Every diode receives four
temperature cycles of one hour at
-55°C and one hour at +150 °C, followed
by 35 hours at 95% relative
humidity and 70 °C. Technical Information
Service, Raytheon Manufacturing
Co., 55 Chapel St., Newton 58, Mass.
TELE -TECH & ELECTRONIC INDUS-
TRIES (Ask for 4 -9)
TW AMPLIFIER
This traveling wave tube features
broadband operation from 1 to 2 kilo -
megacycles without the necessity of
making any electrical or mechanical
adjustments. It finds its greatest use
where this broadband characteristic
can be utilized. Grid. control is provided
for variable gain and power output
applications. Approx. operating characteristics
over this band are 30 db gain
provide a high -cascode transconductance
to plate- current ratio. The 4BS8
for series string applications has the
same advantages as the 6BS8. Typical
cascode conditions and tube characteristics
are: Plate Supply Voltage 250 v.;
Grid Voltage 1 v.; Plate Current 16
ma; Grid Voltage for Gm -50 umhos
(approx.) 6 v.; Transconductance 10,000
umhos. Tubes are factory tested under
operating cascode conditions. Westinghouse
Electronic Tube Div., Dept.
T -215, P. O. Box 284, Elmira, N. Y.
TELE -TECH & ELECTRONIC IN-
DUSTRIES (Ask for 4 -15)
THERMISTOR KIT
A new "see- easy" kit with 12 standard
thermistors in a plastic compartment
case for reference by engineers
and designers is provided with spec.
sheets covering dimensions, electrical
characteristics, and temperature -resistance
relationships of the rod -type
thermistors. Thermistor applications in
electrical and electronic sensing, controlling,
and indicating devices are
cataloged. The 12 units cover resistance
less than 3.0 milliv. rms on the plate of
each triode when the tube is operated
in a typical resistance coupled amplifier
circuit. This has been achieved by design
features that include a reverse coil
heater which helps cancel magnetic
coupling. Factory- testing to meet low
hum specifications, provides a guarantee
that the new tube will meet a min.
hum capability, regardless of manufacturer.
Sylvania Electric Products
Inc., 1740 B'way, New York 19, N. Y.
TELE -TECH & ELECTRONIC IN-
DUSTRIES (Ask for 4 -23)
JUNCTION TRANSISTORS
Germanium Products Corp. has begun
large -scale production of a complete
line of precision durable silicon grown
junction transistors. The new transistors
are currently available in two categories,
one with emitter voltage of two
volts and the other, the "A" category
with emitter voltage of five volts. Four
types of transistor in each series cover
a wide range of special operating requirements.
Size compares with a min-
3t
and 10 milliwatts output. The unit requires
a 300 gauss field and a 250 v.
regulated power supply. Huggins
Labs., Inc., 711 Hamilton Ave., Menlo
Park, Calif.
ranges from 25 ohms to 1 Meg. Kit is
priced at $14.75, plus postage. Friez Instrument
Div. of Bendix Aviation Corp.,
Baltimore, Md. TELE -TECH & ELEC-
TRONIC INDUSTRIES (Ask for 4 -53)
iature electron tube of a comparable
rating. Bogue Electric Manufacturing
Co., 52 Iowa Ave., Paterson 3, N. J.
TELE -TECH & ELECTRONIC IN-
DUSTRIES (Ask for 4 -10)
122
Tele -Tech & ELECTRONIC INDUSTRIES June 1956