Product: FHCFAXD 1Pcs MJL4302AG MJL4281AG Power Audio Pair Tube TO3P Overview This listing is for a power complementary audio transistor pair identified as MJL4302AG and MJL4281AG in a TO3P package. These silicon power transistors are designed for use in audio output stages and other power amplifier circuits where reliable thermal performance and stable operation are required. Key benefits Direct replacement for common power audio output transistors with the same model numbers, simplifying repairs and upgrades. TO3P metalized package provides secure mounting to a heatsink for effective thermal management during extended operation. Complementary NPN and PNP pair supports balanced pushpull amplifier designs and reduces the need to source matched devices separately. Robust electrical ratings suitable for demanding amplifier output stages, helping maintain consistent performance under load. Straightforward installation and compatibility with standard audio amplifier topologies and layouts. Main features and attributes Function: Complementary power audio transistors for output stages and power switching in audio applications. Models: MJL4302AG and MJL4281AG as listed. Package: TO3P package for secure heatsink attachment and enhanced thermal dissipation. Material: Silicon semiconductor construction for stable longterm performance. Performance characteristics: Designed for collector current and power dissipation typical of power amplifier output devices. Proper biasing and heatsinking are required for operation. Practical applications and use scenarios scenario: failed output transistors in a vintage or modern hifi amplifier to restore full output power and channel balance. DIY project: Use as the output stage devices in a custom built class AB home audio amplifier requiring matched complementary transistors. Professional maintenance: Install as replacement parts in small PA systems or studio monitor amplifiers during routine servicing. Installation notes Mount securely to a compatible heatsink using correct insulating hardware or direct mounting as required by the circuit design. Observe correct pin orientation and polarity when installing to avoid damage. Ensure amplifier biasing and thermal compensation are set according to the amplifier design or service manual. This product is supplied as the specified transistor pair in TO3P packaging for audio and power amplifier applications.