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Set of 4 vintage variable neutralizing capacitors for high-power tube RF amplifiers and transmitters

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$29.99
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Description

Set of 4 vintage variable neutralizing capacitors for high-power tube RF amplifiers and transmitters

This is a set of 4 vintage variable neutralizing capacitors (also called neutralizing condensers) for high-power tube RF amplifiers and transmitters.Key Specifications & Data
  • Type: Adjustable plate-to-grid neutralizing capacitors. These provide a small, precisely adjustable capacitance (typically 1–20 pF range depending on model) to cancel out unwanted feedback through the tube’s interelectrode capacitance and prevent oscillation.
  • Construction:
    • Ceramic/porcelain insulators with metal plates or discs.
    • Screw or lever adjustment mechanisms for fine tuning.
    • High-voltage rated (suitable for 1– several kV RF).
  • Top-left: Large disc-style with "MADE IN U.S.A." marking — robust, high-voltage design.
  • Bottom-left: Black bakelite/phenolic discs with part number marking (appears to be "000165" or similar).
  • Others: Smaller adjustable types with different mounting styles.
These are classic 1950s–1970s components commonly used in grounded-grid or grid-driven tube amplifiers.Common Gear Used With
  • EF Johnson Viking series (Valiant, Ranger, Thunderbolt, Desk KW, etc.)
  • Hallicrafters (HT-32, SR-2000 Hurricane, etc.)
  • Heathkit (SB-200, SB-220, SB-401, etc.)
  • Collins, Drake, Swan, and many homebrew kilowatt amplifiers using tubes like 811A, 572B, 3-500Z, 4-400A, 813, etc.
  • General boatanchor transmitters and linear amplifiers from the vacuum-tube era.
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