Use keywords to find the product you are looking for... ADVANCED SEARCH
6J4P / 6Zh4P / EF94 / 6AU6 tube - $1.50/ea In Stock

6K4P / EF93 / 6BA6 / W727 tube - $1.00/ea In Stock

6P31S / EL36 / 6CM5 tube - $4.00/ea In Stock

6P1P-EV / 6AQ5 / EL90 tube - $2.00/ea In Stock

6J9P / 6Zh9P / E180F / 6688 tube - $1.50/ea In Stock

6K3 / 6SK7 HF pentode tube - $2.00/ea In Stock

6P14P-EV / 7189A / 6BQ5 / EL84M tube - $16.00/ea In Stock

6P18P / EL82 tube (original box) - $2.00/ea In Stock

6P14P-K / 7189 / 6BQ5 / EL84 tube - $12.00/ea In Stock

6P45S / EL509 / 6KG6 tube - $27.00/ea In Stock

6P6S / 6V6 / 6AY5 tube - $4.00/ea In Stock
Site news
24 Dec 2016 - Marry Christmas & NY 2017!
16 Dec 2016 - Server Upgrade
09 Feb 2016 - USPS tracking news #2
24 Dec 2015 - Marry Christmas 2016!
17 Oct 2015 - USPS tracking news #1
The US tubes and Soviet analogues
The Russian/Soviet tubes
Types of some Russian capacitors
Code chart for TESLA tubes
Shipping Info Delivery Stats Payment Info How to Order Privacy Notice Returns Policy Contact Us
Vacuum tubes by types » Pentodes, Tetrodes
Pentodes, Tetrodes
A pentode is an electronic device having five active electrodes. The term most commonly applies to a three-grid amplifying vacuum tube (thermionic valve), which was invented by the Dutchman Bernhard D.H. Tellegen in 1926. The pentode consists of an evacuated glass envelope containing five electrodes in this order: a cathode heated by a filament, a control grid, a screen grid, a suppressor grid, and a plate (anode). The pentode (called a "triple-grid amplifier" in some early literature) was developed from the tetrode tube by the addition of a third grid, the suppressor grid. This served to prevent secondary emission electrons emitted by the plate from reaching the screen grid, which caused instability and parasitic oscillations in the tetrode. The pentode is closely related to the beam tetrode. Pentodes were widely used in industrial and consumer electronic equipment such as radios and televisions until the 1960s, when they were replaced by transistors. Their main use now is in high power industrial applications such as radio transmitters. The obsolete consumer tubes are still used in a few legacy and specialty vacuum tube audio devices.
Output pentode, Beam tetrode Sharp-cutoff pentode Variable-mu, Remote-cutoff pentode
Double pentode, Double tetrode Tetrode
1J29B-V / 1Zh29B-V HF pentode tube
EL95 / 6DL5 RFT tube
12J1L / 12Zh1L / RV12P2000 tube
6J2P-EV / 6Zh2P-EV / 6AS6 / 5725 tube
1P24B-V HF pentode tube
EL41 / 6CK5 / BF61 Tungsram tube
Copyright 2007-   Tubes-Store Inc. All rights reserved.