The Sylvania 6SN7GTA Chrome Dome are great sounding tubes made from the early to mid 1950's. Good high end extension, a warm and full mid range and very good bass extension. Imaging is precise and the perceived staging is wide. Sylvania made these tubes for many different companies such as: Motorola, Magnavox, Philco, Silvertone, Westinghouse and many more. Regardless of the printed label they are all the same tube. Don't mistake these with the lesser desired "Series II Chrome Top". The "Chrome Dome" tubes come in GT, GTA and GTB and will not disappoint...
Amplitrex AT1000 Test Results 95%+ GM = Within NOS Specs 90%+ EM = Within NOS Specs |
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(GM) Mutual Conductance 2600 = NOS |
(EM) Emission 8 gV = Spec |
Noise Test |
(mU) Gain |
TUBE #1 |
2600/2600 (100.0/100.0%) |
7.6/7.8 (95.0/97.5%) |
5/5 |
19.8 19.6 |
TUBE #2 |
2600/2560 (100.0/98.5%) |
7.8/7.6 (97.5/95.0%) |
5/5 |
19.8 19.8 |
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 - 0.0% Gv - 2.5%
- Tube 2: A to B = Mhos - 1.5% Gv - 2.5%
- Match (Tube 1 to Tube 2) (Match Goal = Mhos > 5% / Gv > 10%)
- Tube 1A to 2A = Mhos - 0.0% Gv - 2.5%
- Tube 1B to 2B = Mhos - 1.5% Gv - 2.5%
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