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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
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.
-01KR5E6R0G34RF3XK6G4BR3X72.jpg) 6SL7 6H9C OTK VINTAGE Iron Base Matched Pair | -01KR5GBV05A82Z5AWDYAZV81P9.jpg) 6SN7 6H8C RCA VINTAGE Black Plate USA Matched Pair | -01KR5F8FVPH6S3G6663X7GVTT8.jpg) 6SN7 6H8C RCA VINTAGE USA Smoky Glass Matched Pair |  12AT7 ECC81 VINTAGE Black Plate USA Test Good Matched | -01KR5HF29QY3Q9XTTHZE2F806Y.jpg) 6DJ8 E88CC Amperex VINTAGE TV-7 Tested Holland | -01KR5GMC7FHAY667FC00JGN4YB.jpg) 6SN7 6H8C JAN CANADA VINTAGE Tested TV7 | -01KR5H7EF6B024KGB49FMNQNVE.jpg) 6SN7 6H8C Ken-Rad VINTAGE Black-Plate USA Tested Strong |  6SN7 6H8C USA Vintage Tested TV7 Matched Triode | |
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| Price | $84.00 | $86.00 | $96.00 | $71.00 | $90.00 | $86.00 | $96.00 | $98.00 |
| Origin & Factory | vintage Soviet OTK | Made in USA | Made in USA | vintage USA | made in holland | Made in Canada | USA vintage Ken-Rad | USA-made vintage |
| Stock Condition | matched pair | matched pair | vintage matched pair | single tube | single vintage pair | Vintage preowned stock | single tube | preowned vintage stock |
| Measured Performance | strong emissions tested | TV-7 tested strong | TV-7 tested strong | tested good, emission verified | tv-7 tested good | TV-7 tested good | TV-7 tested strong | TV-7 tested verified |
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