Svetlana SV6L6GC NOS (2006) Matched PAIR

NOS Svetlana 6L6-GC (2006). Perfectly matching PAIR. Dates stamped "06 02" (February, 2006).

These came from a collection with three (3) quads and two (2) pairs in original packaging. The original pairs have sold, so I broke up one of the matching quads to list them as pairs. This listing is for one pair of 6L6-GCs. Verified Matched & NOS with a Hickock Model 752 tube tester:

• Leakage Test: Pass
• Gas Test: Pass
• Gm (Hickock 752): 5900, 5900 (See more info below)
• Gm (Original): 4700, 4700 (See more info below)
• Life: 100%
• NOS/NEW

These tubes test higher on my Hickock 752 than the original measurements (Google AI)

• Low Operating Voltages: Most vintage Hickok testers, including the 752, test tubes at significantly lower plate and screen voltages than an actual amplifier. This means the tube is being measured at only one specific, relatively low point on its characteristic curve, which may not reflect its performance at high-voltage "real-world" conditions.
• Home-Brew Test Conditions: Hickok used proprietary "home-brew" test conditions rather than standard data sheet parameters. Because modern tubes like the Svetlana SV6L6GC may have slightly different internal plate structures or materials than vintage versions, they may react differently to these non-standard voltages.
• On a Hickok Model 752, the expected transconductance () for a healthy Svetlana SV6L6GC generally falls between 5,000 and 6,000 micromhos ().
• Svetlana Performance: High-quality modern production tubes like the Svetlana SV6L6GC often measure at or slightly above the "new" bogey, frequently landing in the 5,500 to 6,000 range on a well-calibrated Model 752.

The readings from the Hickock 752 consistently follow the original measurements, typically about 1100-1200 Gm higher. These tubes test NEW with 100% life remaining.