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| Feature | Specification |
| Tube Type | Beam Power Tetrode (6550) |
| Quantity | Matched Quad (4) |
| Construction | Heavy-duty glass and mica (Reduced microphonics) |
| Equivalents | 6550WE, 6550WD, KT88 |
| Best For | Audio Research, Conrad-Johnson, Ampeg SVT |
| Tone Profile | Linear, Transparent, and Dynamic |