RCA 6V6-GTA NOS (1963) Fully Matched PAIR

NOS RCA 6V6-GTAMatched Pair. Identical pair with matching orange print and date stamps "63-09" (9th week of 1963). Grey plates. "D" Getters.

These came from a large collection of tubes that was sealed in 2014. I obtained the collection in 2021. This listing is for one pair of 6V6GCs. Verified Matched & NOS with a Hickok Model 752 tube tester:

• Leakage Test: Pass
• Gas Test: Pass
• Gm: 4500 & 4700 (See more info below)
• Life: 100%
• NOS/NEW

Note: the photos show the actual test measurement of each tube. The scale is 4x on the Micromhos scale (1000 to 1500), where each hash mark represents 250. A measurement right at 1000 would be (1000 x 4) = 4000Gm.

(Google AI):

For a 1963 RCA 6V6-GTA vacuum tube measured on a Hickok Model 752, the standard transconductance (Gm) range remains identical to the vintage 6V6-GT, as the electrical characteristics relevant to a tube tester did not change between these versions. 

Standard Values for RCA 6V6-GTA

• Average New (Bogey) Value: 3,750  is the target reading for a brand-new tube.
• Minimum Good (Reject) Value: Approximately 2,250–2,300 . Most Hickok charts, including those used for the 752, set the discard point at roughly 60% of the new value.
• Strong New-Old-Stock (NOS) Reading: It is very common for high-quality 1960s RCA 6V6-GTAs in top condition to test well above the bogey, often measuring between 4,200 and 5,200 .

GTA vs. GT Differences

While their  ranges are the same, the GTA suffix introduced in the late 1950s indicates an upgraded "Controlled Warm-up" time (11 seconds) and a slightly higher maximum plate dissipation (14 watts vs. the 12 watts of the original GT). These upgrades were designed for the higher demands of television vertical deflection circuits, but they make the 1963 RCA GTA a particularly robust choice for guitar amplifiers like the Fender Deluxe Reverb. 

 These tubes test NEW (strong) with 100% life remaining.