T EVIS i - AmericanRadioHistory.Com

O
nE w TUBES
permits the tube to be mounted in any
position.
Maximum ratings include a peak
maximum cathode current of 5 amperes,
an average maximum cathode
current of 1.25 amperes, and a max-
AR- COOLED IGNITRON
National Electronics, Inc., Geneva,
Ill., has recently developed a 56- ampere
ignitron which does not require water
cooling and is electrically similar to
the 5551 Size B ignitron tube. Elimination
of water cooling is expected to
permit the use of ignitron tubes in
fields where their application has previously
not been feasible.
Designated as NL -1005, this tube is
designed for forced air cooling, but it
may be used at reduced ratings with
free ventilation. It is capable of controlling
maximum r.m.s. demand current
of 2400 amperes at 250 volts a.c.
or 1200 amperes at 500 volts a.c. Maximum
average anode current rating is
56 amperes d.c. When used for welding
control, the NL -1005 is the approximate
equivalent of a 300 -ampere magnetic
contactor.
Complete technical data are available
from the manufacturer.
PICTURE TUBE REPLACEMENT
The addition of the type 16K /RP4 to
Du Mont's picture tube replacement
line has been announced by the Cathode -
Ray Tube Division of Allen B. Du Mont
Laboratories, Inc., Clifton, N. J. It is a
glass rectangular type employing magnetic
focus and deflection.
Production of this tube, which is
already under way, will provide the
service industry with a complete Du
Mont line of round and rectangular
glass picture tubes for replacement.
GERMANIUM DIODES
Amperex Electronic Corporation announces
the addition of a line of seven
germanium diodes of the hermetically
sealed glass variety which are not af-
fected by atmospheric conditions of
humidity, altitude and extremely low
temperature.
Types 1N34A, 1N38A, 1N54A and
1N58Á are electrically interchangeable
with the well -known standard types.
New types include: 1N86 -a general
purpose diode, 1N87 -a video detector
diode, and 1N88 -a d.c. restorer diode.
Complete technical data are available
on request from Amperex Electronic
Corporation, 230 Duffy Avenue, Hicksville,
L. I., N. Y.
X -BAND ATR TUBE
Designed for operation in the X -band
at a frequency of 9280 mc., the Type
6276 ATR is electrically but not mechanically
interchangeable with such
types as the 1B35 and 1B35A. Introduced
by Microwave Associates Inc.,
22 Cummington Street, Boston 15,
Mass., it features a braid gasket flange
type of mounting located near the window
instead of a resonant choke -
mounted seat. Because of this, lower
values of normalized equivalent con-
ductance and freedom from arcing at
high power operation are achieved.
The Type 6276 is completely silver -
brazed, resulting in electrical and mechanical
uniformity. It is small and
compact in design, having an over -all
length of only one inch. The tubulation
is located on the narrow side of the
wave guide body, thus providing greater
clearance for associated equipment.
HALF -WAVE RECTIFIER
A half -wave rectifier designed for
high -voltage rectifier circuits has been
added to General Electric's industrial
tube line. It is intended for use in radio
and television transmitters, industrial
heating oscillators, and other applications
where high voltage d.c. is required.
The GL -4B32 is an inert -gas-filled
tube which will operate over a wide
temperature range -from -55 to 70 C.
Use of an inert gas instead of mercury
imum peak inverse anode voltage of
10,000 volts. Further information may
be secured by writing to the General
Electric Company, Tube Department,
1 River Road, Schenectady 5, N. Y.
VERTICAL DEFLECTION AMPLIFIER
Now in production at the Radio Tube
Division of Sylvania Electric Products
Inc., at Emporium, Pa., is a miniature,
high perveance, double triode, vertical
deflection amplifier designated as Type
12BH7.
This unit consists of two completely
independent medium -mu triodes in a
T -61/2 envelope. One section may be used
as the sawtooth generator while the
other section serves as the vertical deflection
amplifier. Both sections are designed
to withstand the high pulse voltages
normally encountered in vertical
amplifier service. For certain applications
where the plate supply voltage
must be kept low, parallel connection of
the two sections may be used.
TWIN TETRODE
Designed for wide -band operation as
an r.f. amplifier, modulator, frequency
doubler or a tripler, the new Amperex
u.h.f. and v.h.f. twin tetrode is a smaller,
mechanically and electrically improved
version of the Amperex AX-
9903/5844 tube. Improved h.f. performance
is possible with this new tube,
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R A D I
- E L E C T R O N I C E N G I N E E R I N G APRIL, 1953