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The Siemens E180F, also known as the 6688, is a special-quality miniature pentode developed for wideband amplification. It belongs to a generation of tubes engineered for extended service life, mechanical durability, and precise electrical characteristics. Its nine-pin B9A base, 6.3V/300mA heater, and nominal transconductance of 16.5mA/V support its role as a compact, high-transconductance amplifier tube.
All Archive tubes are thoroughly tested, inspected, photographed, and inventoried, guaranteeing the quality of each tube that's shipped to customers. All tubes carry an Apos 12-month warranty against manufacturing defects.
Because these are genuine New Old Stock tubes, small cosmetic irregularities may be present. These aren't defects but artifacts of vintage manufacturing and decades of storage. They have no impact on reliability or sonic performance.
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