RCA 6SL7GT 1956 Gray Glass "Bottom D Getter" NOS NIB Tube "Satisfaction Guaranteed"

Listing details

One RCA 6SL7GT Preamp Tube

NOS / NIB — Made in 1956

Satisfaction Guaranteed

Gray Glass • Black Plates • Bottom D Getter

Black Base with Silver Lettering

Date Code: KC = 1956

Original Box Included

This Tube Is New

Inv. # 7-4 77798948

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🧪 TEST RESULTS (Triplett 3444)

• Good Gm Range: > 1,000

• Average New Gm: ~1,600

• This Tube: 1700 / 1690 Gm

• Plate Current: 2.5 / 2.5 mA

• No Shorts or Leakage Detected

• Verified Low Noise

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🎯 RECOMMENDED AUDIO GEAR

This RCA 6SL7GT is well-suited for classic and modern tube gear using octal dual triodes:

• Ampeg Heritage B-15

• Alessandro Italian Greyhound

• Alessandro Black & Tan (2005)

• Almarro A318B

• Eddie Current headphone amps

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🧠 WHY THIS ONE STANDS OUT

• Black Plates for smoother mids

• Gray Coated Glass for reduced microphonics

• 1956 RCA build — a trusted era for classic 6SL7GT tone

• Bottom D Getter = traditional vintage structure

Packed securely. Shipped quickly. Stored upright.