EL84 Vacuum Tube Pair Pairing (2 PCS Matched) for Guitar and HiFi Amplifiers Key benefits Matched pair for balanced output: Both tubes are matched to closely similar electrical characteristics to help maintain consistent idle current and balanced performance in pushpull amplifier circuits. Direct replacement and upgrade: Standard EL84 9pin Noval base design fits amplifiers that use EL84 or 6BQ5 tubes for straightforward installation. Reliable laboratory testing: Each tube is tested for emission and mutual match so you receive two units that perform consistently together. Restore or improve amplifier behavior: Suitable for replacing worn tubes to reduce hum, imbalance, or uneven output between channels in small power amps. What it is and how it works Function: Power output vacuum tube designed for low to mediumpower audio output stages in guitar amplifiers and stereo HiFi equipment. Construction: Standard glass envelope with internal metal electrodes and a 9pin Noval base for reliable socket contact. Compatibility: Fits equipment specified for EL84 or 6BQ5 tubes. Intended for use as output tubes in singleended or pushpull configurations where EL84 is specified. Performance and technical notes Matched characteristics: Tubes are selected and matched for emission and plate current to minimize channel imbalance in paired installations. Typical application range: Commonly used in amplifiers that produce around singledigit to low doubledigit wattage per channel when configured with EL84 output stages. Exact output depends on amplifier design and circuit. Installation: Designed for direct swap into EL84/6BQ5 sockets. When replacing tubes, check amplifier bias and follow manufacturer guidelines for safe operation and performance. Practical attributes Size and fit: Standard EL84 physical dimensions and 9pin Noval base for direct compatibility with EL84/6BQ5 sockets. Material: Glass envelope with metal internal elements common to vacuum tube construction. Package: Two matched tubes supplied as a pair for easy replacement of both output devices in a pushpull amplifier. Use scenarios Guitar amplifier maintenance: an aging pair of output tubes in a small tube combo or head to restore balanced output and reduce channel mismatch. HiFi stereo upgrade: Swap a matched pair into a small tubebased stereo power amp to maintain consistent leftright channel performance. DIY amp build or : Install matched EL84 tubes when assembling or repairing lowpower tube amplifiers to ensure predictable biasing and symmetry between output devices. Notes and recommendations Compatibility check: Confirm your amplifier specifies EL84 or 6BQ5 tubes and a 9pin Noval socket before . Biasing: Some amplifiers require bias adjustment after tube replacement. Follow your amplifier manual or consult a qualified technician when . Safe handling: Handle tubes carefully to avoid damage. Allow the amplifier to cool and disconnect power before performing tube replacement. What is included Two EL84 vacuum tubes matched and tested as a pair for audio amplifier use.