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EBL21 Tesla VINTAGE Copper Base Output Tube
RARE VINTAGE TESLA OUTPUT TUBE — TESTED AND READY 💎 A desirable preowned EBL21 from Tesla, featuring the sought-after copper base construction. Clean, tested stock for high-end tube audio restorations and vintage amplifier use. Tube Details and Codes 📌 • Type: EBL21 power/output tube • Brand: Tesla • Construction: Copper base • Origin: European vintage production • Condition: Used, fully tested Testing and Performance ⚡ • Verified working properly • Tested for reliable operation • Suitable for replacement or upgrade in compatible tube gear • Strong choice for serious vintage audio systems Sonic Signature 🎵 • Warm, musical presentation with classic tube texture • Smooth midrange and engaging vintage character • Ideal for listeners seeking authentic old-school hi-fi tone
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The Output Heritage Gallery
Explore a curated collection of legacy output tubes, where mid-century manufacturing mastery meets modern laboratory verification to ensure unwavering thermal stability and sonic precision.
Hover image to Zoom | -01KS7MWGP05CR3VKW49W6HSQBR.jpg) EBL21 Tesla VINTAGE Copper Base Output Tube |  EL12 Tesla VINTAGE Pear-Shaped Smoky Glass Tested Good | -01KS7K8RNS55EKRGE9PR5Z0Y4C.jpg) 6BQ5 EL84 Valvo VINTAGE Tested Good German Power Tube | -01KS7KVT29HKXBK549XZ5D4XVQ.jpg) EL95 6DL5 Siemens VINTAGE Tested Like NOS | -01KS7MTD94X8YW656GWMZEZXQF.jpg) AL4 Tesla VINTAGE Tested Czech Power Tube | -01KS7MP95R2TNHAND2NWC5KEVK.jpg) EL95 6DL5 Telefunken VINTAGE Diamond-Bottom Tested | -01KS7MKNBZMV2XPAGESXQN4PGH.jpg) EL12 RFT VINTAGE German Power Tube Test Good | -01KS7K47QT6CB2GFDV90G66HZ3.jpg) 6V6 RCA VINTAGE USA Smoke-Glass Strong Tested |
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| Price | $84.00 | $84.00 | $93.00 | $73.00 | $82.00 | $79.00 | $84.00 | $86.00 |
| Origin & Factory | European vintage Tesla | Tesla Czech Republic | German vintage Valvo | German vintage Siemens | Czech vintage Tesla | German Telefunken stock | German vintage RFT | Vintage RCA USA |
| Stock Condition | used tested stock | single vintage tube | single tested tube | tested old stock | vintage stock | vintage rare stock | used vintage stock | Single tube |
| Measured Performance | verified working properly | tested good | tested good TV-7 | tested like NOS | tested on tube tester | visually checked strong emission | tested good functional | Strong tested TV7 |
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