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300B — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/300B
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-06T12:48:43.769Z
SHA-256 of the archived text: 72be8fdae78c908254c7420f1e7083dfd7e595f7b96b668590abed8e08e89b08
Stable URL of this page: https://metraipolis.com/documento/dc_64cd07b68fb2

How to cite

300B — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/300B (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_64cd07b68fb2 (Metraipolis archive dc_64cd07b68fb2, sha256 72be8fdae78c908254c7420f1e7083dfd7e595f7b96b668590abed8e08e89b08)

BibTeX

@misc{dc64cd07b68fb2,
  title = {300B — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/300B},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_64cd07b68fb2; sha256 72be8fdae78c908254c7420f1e7083dfd7e595f7b96b668590abed8e08e89b08},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/300B. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In electronics, the 300B is a directly-heated power triode vacuum tube with a four-pin base, introduced in 1938 by Western Electric to amplify telephone signals. It measures 6.4 in (16 cm) high and 2.4 in (6.1 cm) wide, and the anode can dissipate 40 watts thermal. In the 1980s it began to be used increasingly by audiophiles in home audio equipment. The 300B has good linearity, low noise and good reliability; it is often used in single-ended triode (SET) audio amplifiers of about eight watts output. A push–pull pair can output 20 watts. As of 2022 manufacturers of 300B and other tubes of similar characteristics included EkspoPUL (Electro Harmonix brand), ELROG, Emission Labs - EML, JJ Electronic, KR Audio, TJ FullMusic, Hengyang Electronics (Psvane brand), Linlai, Takatsuki Electric and Western Electric. Prices for new 300B tubes ranged from US$175 to $2,000 per matched pair. Western Electric (tube manufacturer), a small, privately owned company in Rossville, Georgia resumed production of the original 300B in 2018 using the original, 1938 manufacturing standards on a modernized assembly line housed at the Rossville Works.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «300B» — https://en.wikipedia.org/wiki/300B
Wikidata Q4634305: «Directly-heated audio frequency power triode» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q4634305
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/300B?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1354452348, consultata il 2026-11-06T12:43:14.338Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: f2cb78576c0251a5065c7c32b90b964ff833960d00c7cc16c81b35c1aec6a42a