WE 300B
Western Electric™ 300B Vacuum Tube
Classification:
Moderate power, filamentary triodes for Class A service.
Application: Audio-frequency amplifier in
positions where power outputs of approximately ten watts or less
are required at relatively low plate voltages.
The WE300B
is a vacuum tube with a long history of high performance and great
sound. The current generation of the 300B is receiving praise from
a wide range of listeners and amplifier producers alike. Surf on
in for more information!
WE300B tubes are
available in Singles or as Matched Pairs, Quads or Octets. The
performance curves for each tube produced are stored in the
computer which controls the test sequence. Another computer then
performs the matching algorithm, working from the entire single
tube
inventory, to find the best matched pair for each order. Matched
Pairs, Quads, and Octets are shipped in a laser engraved cherry
box which protects the tubes in transit, as well as assuring
authenticity.
Each tube ships
with a card which contains the actual performance curves for that
particular tube, not just the design curves. Note the serial
number and date of the test. Each card is printed on a printer
attached to the test station. The curves are measured for each
tube!
WE 300B
Technical Data Sheets
Classification:
Moderate power, filamentary triodes for Class A service.
Dimensions: Dimensions, outline diagrams
of the tubes and bases, and the arrangement of electrode
connections to the base terminals are shown in Figures 1 and 2.
Base and Mounting: These vacuum tubes employ medium,
four-pin thrust type bases suitable for use in Western Electric
143B or similar sockets. The 300B tube has the bayonet pin so
located that it may also be mounted in a Western Electric 1OOM,
115B or similar socket. The tubes may be mounted in either a
vertical or horizontal position. If mounted in a horizontal
position, the plane of the filament, which is indicated in Figure
2, should be vertical.
Average Direct Interelectrode Capacitances
- Grid to plate 15 µµf.
- Grid to filament 9 µµf.
- Plate to filament 4.3 µµf.
Filament Rating
- Filament voltage 5.0 volts, a.c. or d.c.
- Nominal filament current 1.2 amperes
The filaments of these tubes are designed to
operate on a voltage basis and should be operated at as near the
rated voltage as possible. When alternating current is used for
heating the filament, the grid and plate returns should be
connected to a center tap on the secondary of the filament
transformer.
Characteristics of the 300B Vacuum
Tube
- Average characteristics -
(Ef = 5.0 volts, a.c., Eb = 300 volts and Ec = -61 volts).
- Plate current 60 milliamperes
- Amplification factor 3.85
- Plate resistance 700 ohms
- Grid to plate transconductance 5500
micromhos
- Limiting Operating Conditions for
Safe Operation
(Not simultaneous ratings)
- Maximum plate voltage 450 volts Maximum
plate dissipation: 40 watts
- Maximum plate current of average tube for
fixed grid bias: 70 milliamperes
- Maximum plate current for manually adjusted
grid bias or self-biasing circuit: 100 milliamperes
Recommended Operating Conditions
Recommended and maximum conditions for
alternating-current filament supply are given in the table.
Recommended conditions or others of no greater severity should be
selected in preference to maximum conditions wherever possible.
The life of the tube at maximum operating conditions will be
shorter than at the recommended conditions.
Where it is necessary to operate the tube at or
near the maximum plate current of 100 milliamperes, provision
should be made for adjusting the grid bias of each tube
independently, so that the maximum safe plate current will not be
exceeded in any tube. Alternatively, a self-biasing circuit may be
used, in which the grid bias for the tube is obtained from the
voltage drop produced by the plate current of that tube flowing
through a resistance.
Where it is necessary to use a fixed grid bias,
the plate current of the average tube should be limited to a
maximum value of 70 milliamperes, so that tubes having plate
currents higher than the average will not exceed the maximum safe
plate current.
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Prezzo / price
US DOLLARS
400,00 / single
900,00 / matched pair
1840,00 / matched quad
Iva ESCLUSA
Vat NOT included




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