Vacuum Tubes
Vacuum tubes are small glass tubes that contain no gases, only a vacuum of air. What makes vacuum tubes work is an electrical charge that flows through a filament. This was discovered by Thomas Edison while he was working on a light bulb. He discovered that electricity does not need wire to travel, but can travel through some gases and even a vacuum. This was dubbed the Edison effect, and was the only scientific work that Edison ever did. Being an inventor, he was not a scientist.
Then, in 1904, Edison’s work was put to great use by a British scientist named John A. Fleming. Fleming created a vacuum tube known as a diode. The diode was known as a valve back then, because it forced current in the tube to go only one direction.
Since then, vacuum tubes have found their way into almost all different sorts of electrical devices. You can acquire vacuum tubes of all kinds from various dealers and companies for whatever your need. Luckily all vacuum tubes can still be purchased new, so vacuum tubes are never really any trouble to replace, even on vintage gear.
Buy Vacuum Tubes Here
 ZENITH 6SN7GTB TUBE  US $.99
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 12H6 METAL VACUUM TUBE USED TESTED A+ GOOD CONDITION US $3.94
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 Five (5) Sylvania 6SN7 GTB Tubes, Chrome Dome, bases CC, DD, DF, BA, EL, Tested US $9.99
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 2*Tube Base 8 Pin Ceramic Socket Gold Plated for KT88 US $9.99
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 NOS NIB Valvo EM 4 EM4 Tuning indicator NOS NIB US $85.00
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 BRAND NEW NOS PAIR SYLVANIA 17GT5 TUBES NIB TUBES TESTD US $4.25
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 USED HALLICRAFTERS 6SN7GT TUBE TEST GOOD HARD TO COME BY TUBE LOOK!!!!!! US $7.00
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 Pair Tung Sol 12AT7 Tubes - good US $45.00
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 RCA/ARCTURUS 6AC7/VT-112 TUBE NOS NIB ............(C6) US $5.95
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 Tube Damper Silicon Ring fit 12AX7 12AU7 6V6GT 6SN7 6SL7 GZ34 10pcs for tube amp US $4.59
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 7C5 USED RADIO TUBE TESTED STRONG US $8.00
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 7N7 USED RADIO TUBE TESTED STRONG US $7.75
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 HYTRON "6A4 / LA" NOS NIB TUBE,FREE U.S. SHIPPING!!! US $34.99
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 ZENITH "6B8" NOS NIB TUBE,FREE U.S. SHIPPING!!! US $9.99
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 PAIR OF RCA "6DG6GT" NOS NIB BLACK PLATE TUBES,FREE U.S. SHIPPING!!! US $14.99
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 Lot of 7 vintage RADIO TUBES US $1.99
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 TUNG SOL 6SU7GTY 6SL7 VT229 MATCHED PAIR NOS TUBES 1945 US $349.99
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 Vintage RCA Type 27 Vacuum Tube Audio Audiophile Original Box US $13.99
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 NOS Sylvania 8CX8 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 6JT8 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 6BH8 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 3AV6 Vacuum Tube Electron Valve New US $5.95
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 Vintage RCA 6BG6 Vacuum Tubes Audio Audiophile Original Box US $13.99
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 NOS Sylvania 6ES5 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 10GK6 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 6AF4 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 8077-7054 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 5GH8 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 3AU6 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 6HL8 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 6AUBA Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 17C5-17CU5 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 12AL5 Vacuum Tube Electron Valve New US $5.95
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 5 General Electric 6414 Military Vacuum Tubes US $13.49
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 NOS Sylvania 6JK8 Vacuum Tube Electron Valve New US $5.95
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 NOS Sylvania 12BK5 Vacuum Tube Electron Valve New US $5.95
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 8-pins tube sockets contacts covere with SILVER QTY=12 US $6.00
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 BRAND NEW NOS PAIR OF GE 6HB7 TUBES GREAT BRITAIN NICE! US $2.95
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 NOS Sylvania 6KZ8 Vacuum Tube Electron Valve New US $5.95
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 VACUUM TUBE ~ 6LJ8 ~ SYLVANIA ~ NOS ~ 6LJ8 US $3.95
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 VACUUM TUBE ~ 12CS6 ~ SYLVANIA ~ NOS ~ 12CS6 US $4.95
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 VACUUM TUBE ~ 1AE4 ~ RAYTHEON / JAN ~ NOS ~ 1AE4 US $14.95
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Vacuum Tube Auction Search
Here are some common vacuum tube search terms:
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Since vacuum tubes are sort of mechanical in nature, they do tend to wear out. For instance, if you purchase a vintage amplifier, you can expect to have to change the original vacuum tubes, because these wear out and break over time. The best way to get vacuum tubes is to simply order them online. Vintage-Audio-Gear.com Provides new and used listings for vacuum tubes.
Obviously vacuum tubes have been replaced by more advanced technology. But for a long time, vacuum tubes made possible things that were never before possible. Things like radios, telephones, amplifiers, and all kinds of other equipment. In fact, many people still believe today that vintage tube amplifiers are much better than regular modern amplifiers. Many believe they sound better, hold up better, and are easier to maintain. And the fact that you can acquire new vacuum tubes when you need them really helps keep these vintage amps up and running!