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6SL7 6H9C OTK VINTAGE Iron Base Matched Pair
AUTHENTIC VINTAGE STOCK — ACTUAL PHOTO 💎 A highly desirable OTK-era 6SL7 / 6H9C pair with iron base construction and excellent used condition. Strong test readings make this a standout choice for collectors and serious tube audio systems. Tube Details and Codes 📌 • Tube Type: 6SL7 / 6H9C • Brand: OTK, Soviet-era manufacture • Construction: Iron base design • Condition: Excellent Used Condition • Matching Status: Matched Pair with strong test results Testing and Performance ⚡ • Tested strong for emissions • Verified for stable operation • Clean, reliable performance for critical tube circuits Sonic Signature 🎵 • Classic vintage tube tone with rich mids • Smooth top end and layered presentation • Excellent for adding depth, warmth, and dimensionality
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The Vintage Preamp Collection
Capture the atmospheric depth of the golden era with laboratory-verified signal artifacts that translate historical manufacturing mastery into a radiant and immersive listening experience.
Hover image to Zoom | -01KR5E6R0G34RF3XK6G4BR3X72.jpg) 6SL7 6H9C OTK VINTAGE Iron Base Matched Pair | -01KSH9DBBRR1CQXWF90CGGZ51D.jpg) 12AT7 ECC81 RSD VINTAGE Made In Germany Strong Tested | -01KSH8G0AZP91G8K7WS56B6K2X.jpg) 12AU7 ECC82 Mazda VINTAGE Made In France Strong TV-7 Tested | -01KSH7S5YQJ2CX2K5WNYB19VBR.jpg) 12AT7 ECC81 Toshiba VINTAGE Matched Pair |  12AT7 ECC81 GE VINTAGE USA Tested Tube | -01KSH8J9SHMZN6PA071R9QNAWZ.jpg) EF86 Telefunken VINTAGE Diamond-Bottom Low Noise Matched | -01KSH8BYAY78ZCW8G1J6S6JXH0.jpg) 12AX7 ECC83 ADZAM VINTAGE Tested Strong Made In Germany | -01KSH89MDX5PD0GXXTFYNCXD6B.jpg) EF806S Tesla VINTAGE Military Spec Strong Test |
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| Price | $84.00 | $71.00 | $90.00 | $81.00 | $71.00 | $84.00 | $95.00 | $79.00 |
| Origin & Factory | vintage Soviet OTK | Made in Germany | Made in France | Made in Japan | Made in USA vintage | Telefunken German vintage | Made in Germany | Tesla Czech military |
| Stock Condition | matched pair | vintage used tube | Vintage single tube | matched pair | preowned tested tube | single vintage tube | single vintage tube | actual vintage stock |
| Measured Performance | strong emissions tested | strong emissions tested | Strong TV-7 tested | tested and matched | test-checked operational | tested for emissions shorts | TV-7 tested strong | strong tested emission |
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