KR Audio 45 Tubes (Matched Pair)

KR Audio 45 Tubes (Matched Pair)

$1,160.00

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Description

The KR Audio 45 (often designated as the KR 45) is a premium, handmade, low-frequency, low-power triode vacuum tube manufactured by KR Audio Electronics.

  • Handmade Construction: Every tube is hand-crafted using SIMAX hard glass. This thick glass structure provides immense structural stability and resistance to external vibrations. [1]
  • Design Philosophy: It utilizes a directly heated triode (DHT) architecture with an open, robust electrode configuration. [1, 2]
  • Audio Characteristics: It is highly regarded by audiophiles for delivering an exceptionally open, refined, detailed, and deeply musical performance. It is primarily designed for high-end single-ended triode (SET) audio amplifiers. [1]
  • Common Applications: Frequently utilized as a premium upgrade in boutique tube amplifiers like the Fi 45, Yamamoto A-08S, and Sophia Electric Baby amplifier. [1]
Technical Specifications
The official electrical and physical specifications of the KR 45 include: [1, 2, 3]
  • Filament Voltage: 2.5 V (AC or DC)
  • Filament Current: 1.3 A
  • Amplification Factor: 3.5
  • Transconductance: 2.2 mA/V
  • Maximum Plate Voltage: 300 V
  • Maximum Plate Current: 50 mA
  • Plate Dissipation: 15 W
  • Output Power: 2 to 5 Watts of pure Class-A power (depending on the SET circuit configuration)
  • Base Type: Standard UX4 4-pin connection [1, 2, 3]

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