RCA 6L6G Tubes. Made in USA

• Pair
• Coke Bottle
• Smoked Glass
• Bottom Detters
• Black Base

R6L6-66

RCA

Manufactured December 1955.

•  Tube tested NOS with TV7 7D/U: 41 / 25 Baseline
• Date Code: 5-52

R6L6-67

6L6G Silvertone Tube. Made in USA

• Manufactured by RCA.

•  Tube tested NOS with TV7 7D/U: 44 / 25 Baseline

• Date Code: 39X MR

Testing & Condition

• Minimum reading: 65% (per original 25 baseline; military standard).

• Tubes test NOS and meet or exceed published GM data.

• All tubes tested for gas, shorts, transconductance, and emissions.

• TV-7 tested (calibrated, military-standard tester). 

About NOS & Testing

• NOS tubes fall within the GM range published in the RCA Receiving Tube Manual; variation above/below average is normal.

• No universal test result defines NOS. Typically, NOS tubes measure between average and maximum micromhos.

• Different testers (even identical models) may produce different readings.

• 100% meter readings are not required—passing = meeting spec range or minimum (TV-7: ~65%).