Tube audio amplifier configured with either 5 × 2SD1047 (D1047) or 5 × 2SB817 (B817) Key benefits Flexible configuration: choose the amplifier populated with five 2SD1047 (D1047) components or five 2SB817 (B817) components to match your existing design or service requirements. Direct replacement compatibility: uses the specified models to simplify repairs, upgrades, and parts-matching in tube audio amplifier assemblies. Consistent audio function: designed to perform the core role of a tube audio amplifier—amplifying audio signals with predictable behavior when integrated into compatible systems. Important attributes Function: tube audio amplifier for audio signal amplification in systems designed to accept the listed component configuration. Models included: available in two versions — 5 × 2SD1047 (D1047) or 5 × 2SB817 (B817). No other components are substituted. Compatibility: intended for circuits, chassis, and maintenance procedures that specify these exact component series; select the version that matches your schematic or parts list. Build considerations: populated with the specified components to maintain interchangeability and straightforward installation or replacement. Typical applications Home audio repair and maintenance: replace worn or damaged assemblies in vintage or custom tube amplifier systems that require the 5 × 2SD1047 or 5 × 2SB817 configuration. DIY and boutique amplifier builds: use the chosen version to match your amplifier design goals and ensure parts-level consistency. Professional servicing: technicians can stock the appropriate option to expedite field repairs and component swaps without re-engineering the amplifier. Ordering note Choose the correct option (5 × 2SD1047 (D1047) or 5 × 2SB817 (B817)) to match your amplifier’s specifications and service documentation.