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Description
Western Electric 300B Matched PairWestern Electric 300B Matched Pair Free shipping. For EU customers, tubes will be shipped from EU. Upgrade your amplifier setup with the finest electron tube ever made. The type 300B is made by hand in the USA using the original Western Electric specifications from 1938. Electron tubes carry a Limited Warranty of ninety (90) days to the end user. The Limited Warranty period may be extended to five (5) years upon return of warranty card included with
Western Electric 300B Matched Pair
Free shipping.
For EU customers, tubes will be shipped from EU.
Upgrade your amplifier setup with the finest electron tube ever made. The type 300B is made by hand in the USA using the original Western Electric specifications from 1938.
Electron tubes carry a Limited Warranty of ninety (90) days to the end user. The Limited Warranty period may be extended to five (5) years upon return of warranty card included with your electron tube purchase.
Legendary WESTERN ELECTRIC 300B DH Triode
Engineered for high performance and long life
What if the best sound was achieved decades ago? In 1938, Western Electric manufactured the first type 300B electron tube. It was a breakthrough power triode, but in those days it worked behind the scenes in the projection room. It was just another component in early Hollywood sound systems. The same great things that served moviegoers in those early days—low noise, ultra-long life, sonic purity and warmth—made it a standout tube for music lovers and vintage audio collectors as decades passed. Deep into the age of the transistor, communities around the world in search of original high-fidelity rediscovered the 300B and its exceptional performance. New amplifier designs brought the tube front and center, its customary yellow lettering on proud display.
Sometimes, the old ways are the best
Today, the 300B is manufactured at the Rossville Works. Our new factory home was custom-built to master the dozens of individual demands of tube making, from sealing the iconic glass bulb to the complex metallurgic processes within. We’ve modernized the production line here and there to establish forward momentum at a company with 150 years of history. Western Electric believes twenty-first century listeners deserve twenty-first century manufacturing standards.
SPECIFICATIONS
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.
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 100M, 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
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 an 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.
Power Output and Distortion
Performance data including power output, second and third harmonic levels for a number of operating conditions are given in the table.
The variation of power output and harmonic levels with load resistance for several values of operating plate current is shown in Figures 7, 8 and 9, for a plate voltage of 350 volts.
The peak value of the sinusoidal input voltage, Egm, which gives the indicated power output, Pm and harmonic levels, F2m and F3m for each point in both the curves and the table, is numerically equal to the grid biasing voltage at that point. For a smaller input voltage Eg, the approximate levels may be computed from the following relations.
P=Pm(Eg/Egm)^2
F2=F2m+20 log10(Eg/Egm)
F3=F3m+40 log10(Eg/Egm)
CHARACTERISTIC CURVES
Plate-current characteristics for a typical tube are shown in Figure 3 as functions of grid bias, for alternating-current filament supply. The corresponding amplification-factor, plate-resistance, and transconductance characteristics are given in Figures 4, 5 and 6, respectively. When direct-current filament supply is used, and the grid and plate returns are connected to the negative end of the filament, the same characteristics are applicable if 3.5 is subtracted from the numerical value of each grid bias.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Product Reviews
★★★★★ 4
Fine, dry glitter in a puff spray bottle
Color: Glint Rainbow
This works well if, and only if, you know exactly what it is and if it'll work for your application.
This glitter comes with no adhesive or stickiness in it. It is not like a glitter stick, or glitter makeup. It is dry glitter in a spray bottle. The spray pattern is very narrow, so if you want to spray it onto a piece of paper or you body, it will show up in a clump. It does not have an airy spray pattern.
To use this, you need to add some stickiness to the surface you want it to stick to first. Something like glue on paper or some sort of sticky thing on your skin that won't sink in. If regular lotion sinks in, the glitter will just fall off. So petroleum jelly or something that sits on top works best.
Also, if you want it spread out instead of in little clumps as it comes out of the spray bottle, you'll have to move it around manually. On some level, to be entirely honest, I'm not sure this application method is better than loose glitter. With loose glitter, at least I can manually sprinkle it and not get a giant blob like with the spray. Also, some little bits get loose with the spray, and loose glitter in a house is just asking for forever glitter.
I'm deducting one star simply because the spray delivery mechanism isn't very useful, and can actually be a liability. Unlike some spray glitters with propellant and adhesive that are more like spray paint and have a more spray paint application profile. This manual puff method just doesn't work well with glitter.
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Reviewed in the United States on April 23, 2026
★★★★★ 5
Dry glitter, not glue
Color: Glint Rainbow
This is dry glitter, not glitter spray. Will need glue for it to stick but it’s very pretty.
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Reviewed in the United States on April 20, 2026
★★★★★ 5
Fine holographic sparkle with smooth and even application
Color: Glint Rainbow
I tested this glitter powder several times over about two weeks while using it on my hair and along the cheek area for festival style makeup looks. The shimmer particles are very fine, which helps create a smooth reflective effect rather than chunky glitter.
The applicator releases a light dusting of powder, which makes it easier to control how much product is applied. I found that building it gradually works best, starting with a light layer and adding more for a stronger sparkle effect.
The holographic finish reflects different tones depending on the lighting, shifting slightly between soft rainbow colors under brighter light. It looks subtle indoors but becomes more noticeable and reflective in direct lighting or outdoor settings.
During wear, the glitter stayed in place for several hours with minimal fallout when applied lightly. I noticed that applying it over slightly set makeup or hair helped it adhere better and reduced loose particles.
With its fine texture, controllable application, and noticeable sparkle under different lighting, it delivers a versatile glitter effect for creative makeup looks. The quantity of the spray was nice and it was durable under the sun too.
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Reviewed in the United States on May 15, 2026
★★★★★ 3
Glitter Bomb
Color: Glint Rainbow
It gets ALL over the place and doesn’t stick all that well. Neat idea but it doesn’t work the way I would hope.
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Reviewed in the United States on March 29, 2026
★★★★★ 5
HEALTH & BEAUTY
Flavor Name: XL silicone socks 2 pairs
LOVE IT
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Reviewed in the United States on April 13, 2026