6SL7GT - Black Glass Tung-Sol - Matched Pair - TWO PAIRS Avail

TWO pairs available.  Price is for ONE PAIR.  CHOOSE QTY 1 TO RECEIVE ONE PAIR.

TV-7 Results:

51/32 & 50/32

50/32 & 50/32

51/32 &50/32

58/32 & 54/32

What they are

• Type: 6SL7GT 

• Manufacturer: Tung-Sol, USA

• Era: late 1940s to early 1950s

• Construction:

  • Black glass envelopes

  • Black phenolic bases

  • Copper-colored internal hardware visible through the glass
    

These are not later gray-glass or rebranded variants — these are the real-deal Tung-Sol builds.

Internal construction notes (why people care)

• Round / oval plate structure typical of early Tung-Sol

• Very robust mica spacing

• Excellent grid alignment → low microphonics for a 6SL7

• Built originally for broadcast, military, and instrumentation use, not consumer cost-cutting like many other tubes

This is the era before bean-counters got involved.

Sonic reputation

This is where these tubes shine:

• Tone: rich, harmonically dense, very “organic”

• Midrange: big, saturated, emotionally engaging

• Highs: sweet, not etched

• Bass: full and rounded (not ultra-tight, but very natural)

• Soundstage: wide with excellent depth

In preamps and driver stages they’re often described as:

“big vintage American tone with zero glare”

How they compare

• Vs RCA 6SL7: Tung-Sol is richer and more textured

• Vs Sylvania 6SL7: warmer, less lean, more romantic

• Vs later production: quieter, smoother, far more dimensional

These are firmly in “end-game 6SL7” territory for a lot of listeners.