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The 6550 is the big American beam tetrode – 42 W plate dissipation, the choice for high-power hi-fi and bass amplification. Shuguang has produced it since 1987, upgraded to the 6550A-98 in 1998.
Lineup
6550A-98
The 1998-upgraded standard version.
6550B
Alternative version with refined internals.
Specifications
Click an image to view the full-size specification sheet.
📄 Shuguang Catalogue 2024 (PDF)
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*We also accept custom orders for factory-level burn-in, precision testing, matched pairs / quads, special grading and OEM requirements. For a quotation or consultation, please contact us here.