Quantity: 2 pieces. Model: 6SN7D vacuum tube. Product overview A pair of 6SN7D dual triode vacuum tubes supplied as two separate pieces. These tubes serve as direct replacements for equipment that uses the 6SN7D designation and are intended for audio, radio, and other vintage or tubebased electronics that require this tube type. Key benefits and why you need it Restores function: worn or failed tubes in amplifiers and radios to the equipment to normal operation. Practical spare set: Two pieces allow immediate replacement of one tube while keeping a spare for future maintenance. Straightforward compatibility: Designed for circuits that accept 6SN7D tubes, making replacement and upkeep simple. Important attributes Quantity: 2 pieces per pack. Model: 6SN7D dual triode tube. Function: General purpose amplification stage in tubebased circuits, commonly used in preamplifiers, driver stages, and vintage radio equipment. Form factor: Standard 6SN7 tube envelope and pin layout for direct fit into compatible sockets. Performance and reliability Intended for reliable operation in typical tube circuit conditions. Suitable as a replacement component for devices that specify the 6SN7D tube type. Use in matched or balanced circuits requires appropriate selection or testing as per the equipment needs. Practical use scenarios a failed preamp tube in a tube amplifier to restore signal gain and normal operation. Keep as a spare pair for maintenance of vintage radios and hifi equipment that use 6SN7D tubes. Use in DIY audio projects or tubebased signal stages when the 6SN7D specification is required. Compatibility note Fits devices and sockets specified for the 6SN7D tube type. Confirm your equipment manual or existing tube markings to ensure correct replacement.