{"id":14848,"date":"2025-01-01T21:21:28","date_gmt":"2025-01-02T02:21:28","guid":{"rendered":"https:\/\/busther.com.co\/tienda\/uncategorized\/national-12by7a-nos-pentode-tube-made-in-usa-tested\/"},"modified":"2025-01-01T21:21:28","modified_gmt":"2025-01-02T02:21:28","slug":"national-12by7a-nos-pentode-tube-made-in-usa-tested","status":"publish","type":"product","link":"https:\/\/busther.com.co\/en\/shop\/electronic-components\/active-components\/vacuum-tubes\/american-series-vacuum-tubes\/12\/12b\/national-12by7a-nos-pentode-tube-made-in-usa-tested\/","title":{"rendered":"National 12BY7A NOS Pentode Tube Made in USA Tested"},"content":{"rendered":"

Tubo 12BY7A National NOS (V\u00e1lvula Pentodo USA)<\/h1>\n

 <\/p>\n

In the world of amateur radio and amplifier restoration, the driver stage is critical; if the signal feeding the power tubes is distorted, the final transmission will be distorted as well. The National 12BY7A NOS tube is an American-engineered solution designed to provide a clean, stable drive signal with the precise gain required by classic equipment.<\/p>\n

This particular unit is a New Old Stock (NOS) item. It features the classic National Electronics logo and distinctive red lettering, confirming its Made in U.S.A. origin. National Electronics earned an excellent reputation for selecting and distributing vacuum tubes manufactured to demanding industrial and military specifications, often sourced from leading American manufacturers such as RCA and General Electric (GE).
As a result, National-branded tubes became known for their exceptional reliability, long service life, and superior mechanical durability, making them a preferred choice among professional technicians, communications equipment manufacturers, and radio amateurs.<\/p>\n

\"{%ALT_TEXT%}\"
{%CAPTION%}<\/figcaption><\/figure>\n

Who Is It For and What Equipment Uses It?
This component is highly sought after by amateur radio operators (Ham Radio enthusiasts) who keep the golden age of tube-based communications alive. The 12BY7A serves as the driver tube, providing the excitation signal required by the final RF power stage, typically employing tubes such as the 6146B or 6KD6.
It is commonly found in legendary amateur radio transceivers and transmitters, including:<\/p>\n

    \n
  • \n

    Kenwood: TS-520, TS-820, TS-530S, TS-830S.<\/p>\n<\/li>\n

  • \n

    Yaesu Transceiver Series: Commonly used in the driver stage of classic Yaesu amateur radio transceivers, including the FT-101 family (FT-101E, FT-101ZD), as well as the FT-901 and FT-902. The 12BY7A provides the RF drive signal required to efficiently excite the final amplifier tubes and maintain proper transmitter performance.<\/p>\n<\/li>\n

  • \n

    Drake and Collins Equipment: Widely used in tube-based transmitters and transceivers from the 1960s and 1970s. The 12BY7A serves as a critical driver tube in many classic Drake and Collins designs, providing the stable RF excitation required for efficient operation of the final power amplifier stage.<\/p>\n<\/li>\n<\/ul>\n

    Technical Specifications (Based on Datasheet Information)<\/span><\/strong><\/p>\n

      \n
    • \n

      Tube Type: Sharp-Cutoff Pentode.<\/p>\n<\/li>\n

    • \n

      Base Type: 9-Pin Miniature (Noval B9A).<\/p>\n<\/li>\n

    • \n

      Heater Voltage: 12.6 Volts.<\/p>\n<\/li>\n

    • \n

      Heater Current: 0.3 Amperes.<\/p>\n<\/li>\n

    • \n

      Transconductance: Exceptionally high for its size (approximately 12,000 \u00b5mhos), providing excellent gain characteristics in broadband RF amplifier and driver stages.<\/p>\n<\/li>\n

    • \n

      Maximum Plate Dissipation: 6.5 Watts.<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

      \"no64.png\"<\/span><\/p>\n

      A vital component for clean transmission in classic radios. Offered here is a National 12BY7A NOS (New Old Stock) vacuum tube, a high-transconductance pentode authentically manufactured in the United States. Preserved in its original packaging, it is the driver tube of choice for many premium vintage amateur radio transceivers and transmitters.
      Its condition, emission, and transconductance have been verified using a professional tube tester, confirming proper operation and suitability for restoration projects. Ideal for use in conjunction with final power amplifier stages employing tubes such as the 6146B, where clean and stable RF drive is essential for optimum transmitter performance.<\/p>\n","protected":false},"featured_media":14846,"comment_status":"open","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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