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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
4.8 ★★★★★
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Product Reviews
★★★★★ 5
Great Light Weight String Trimmer and Edger!
Style: String Trimmer
I'm a 60 year old female and bought this because of the light weight. It was easy to put together, however, the instructions that came with it were terrible. It included only black and white images, with no written instruction. I found a great tutorial on YouTube that told how to assemble it and use it, and another on how to change the string. Buy extra string, so you'll have it ready! It does a great job on weeds and ivy. The edger is great. It is adjustable, but probably not the best for anyone taller than 5'6. It's noisy, but not so bad that it requires ear protection. I like that it's corded which makes it lighter and I don't have to fool with gas or heavy batteries.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Great weed wacker
Style: String Trimmer
Works great. Plenty of power. Did my weeding in a fraction of the time of my battery operated weed wacker
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Reviewed in the United States on May 15, 2026
★★★★★ 5
Great weed wacker!
Style: String Trimmer
BLACK+DECKER Weed Wacker with Auto Feed, corded 14-Inch 2 in 1 String Trimmer Lawn Edger, Powerful 6.5-Amp.
I recently purchased this trimmer and really like it. It took less than a minute to set up, and the adjustable height and handle make it very comfortable to use. It easily rotates between a string trimmer and a wheeled edger for clean lawn borders. I did go through two spools of line for 7,000 sq. ft. of grass, but for the price, it’s a very impressive tool.
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Reviewed in the United States on May 5, 2026
★★★★★ 3
Serves its purpose-EDIT
Style: String Trimmer
Experience as of 8/1/24
Pros: ease of use, weight, power, price point.
Cons: There is no way to get out of spending a fortune on string. Manufacturer defect why this is so cheap & discontinued. Shame on them. I've tried everything in my unknowledgeable unprofessional experience. Silicone spray lube does help & plastic core has to be in like new condition - not even slight wearing. I've bought hardcore string, still rolls out too fast & gets stuck a lot because motor can't handle & tends to heat up string which causes it to bind. I've tried removing auto feed lever & auto cutter, worse. Kept past 30 days & tinkering voids my warranty. If $ spent on buying exorbitant amounts of string is not a concern, everything else is perfect. I have an old B&D from the early 2000s still kicking grass. I just hate batteries. So I can either buy a new weed whacker or buy batteries.
3.75 stars
Pros: Great power even with 200 ft cord (use proper cords). Works quickly & efficiently & powerful. The edger works outstanding. Used around chain fencing hard rocks & blacktop. Normal to high grass up to 12 in. adjustable Lightweight & easy to operate for a 62yo 5'2" female.
Cons: using electric cord was a pain for me but once get used to it no matter. The string automatically feeds but extremely fast. I believe it has to do with where & what you're up against. Many many times I had to stop & adjust the string roll. I found if ur careful about inserting properly & hearing the click it works better but again if you're operating under more than moderate conditions it seems to stick more & you have to adjust. That seems to be a design flaw in manufacturers use of cheaper materials.
The string it comes with is extremely short & runs out quickly. Based on other correct reviews I bought a B&D refill 3pack. Not the best either. I used all 3 rolls in 2.5 rounds of 1/4 acre back yard (hard conditions) & 1/8 acre front yard & blacktop edging. Better off buying bulk cheaper $ & restringing roll cores. I believe this also has to do with conditions of use and the B&D string is not any stronger than discount string. I purchased a bulk tougher string & will see if there's any difference in quantity usage.
This is not the best but not the worst. There are hardly any corded options for weed eaters but I was determined to stay with corded option because batteries are so unreliable these days. Product still a good value for the price. Disclaimer only sporadically using battery weed eaters a few years.
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Reviewed in the United States on June 19, 2024
★★★★★ 5
Great edger for home use
This WORX 12 Amp Electric Lawn Edger did exactly what I needed it to do. It was easy to use, had plenty of power for cleaning up the edges around my driveway and sidewalk, and gave the yard a much cleaner, finished look. I like that it is corded because I do not have to worry about batteries dying, and it has enough power for regular homeowner use.
The first pass took a little extra time since the edges needed cleaned up, but once I got going, it worked great. Overall, this is a solid edger/trencher for the price, and I would definitely recommend it for anyone wanting cleaner lawn edges without dealing with gas.
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Reviewed in the United States on May 29, 2026