Pair of 6SN7GTB by General Electric with Side Getter, short glass envelope and copper grid posts. These rare GLOW DOME tubes were made for a short time in the late 60's to the mid 70's and account for less than 2% of all the GE 6SN7's ever made. These are without a doubt one of my most requested tubes. Pleasant warmth in the mid-range, nice bass and excellent detailed top end. The side mounted getter adds rigidity to the plate structure thus reducing microphonics. These are a bargain now but are quickly being gobbled up by audiophiles. Discover the quality of these quality USA made tubes as they will be worth their weight in gold in the future...
Amplitrex AT1000 Test Results 95+% GM = Within NOS Specs 90+% EM = Within NOS Specs | ||||
| (GM) Mutual Conductance 2600 = SPEC | (EM) Emission 8.0 gV = SPEC | Noise Test | (mU) Tube Gain |
TUBE #1 | 2600/2550 (100.0/98.1%) | 7.7/7.7 (96.3/96.3%) | 5/5 | 19.8 19.1 |
TUBE #2 | 2600/2600 (100.0/100.0%) | 7.8/7.8 (97.5/97.5%) | 5/5 | 19.1 19.1 |
TUBE #3 | N/A | N/A | N/A | N/A |
TUBE #4 | N/A | N/A | N/A | N/A |
- PERFECT = 0.0% (5% or Less = Outstanding)
- Balance (Balance Goal = Mhos > 5% / Gv > 10%)
- Tube 1: A to B = Mhos - 1.9% Gv - 0.0%
- Tube 2: A to B = Mhos - 0.0% Gv - 0.0%
- Match (Tube 1 to Tube 2) (Match Goal = Mhos > 5% / Gv > 10%)
- Tube 1A to 2A = Mhos - 0.0% Gv - 1.3%
- Tube 1B to 2B = Mhos - 1.9% Gv - 1.3%
- Noise Test Scale: 5 = Ultra Low; 4 = Very Very Low; 3 Very Low
- Tube Gain Scale : 20 Mu (+ or -) 3 Mu = Nominal
NIB: New in Original or White Box
NOS: New Old Stock (given to tubes that meet or exceed factory values)
UTS: Used Tube Tests Strong
UTG: Used Tube Tests Good
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