National (GE) 6550 Gold Line Matched Pair Tubes, New Old Stock (NOS)
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National (GE) 6550 Gold Line Matched Pair Tubes, New Old Stock (NOS)
SkyFi 479
479 South Broad Street
Glen Rock NJ 07452
United States
The other set of these we listed sold out in under an hour.
This set of tubes is actually a New Old Stock (NOS) matched pair set.
We believe these to be NOS GE Tubes rebranded under National's Gold Line Series.
They have matching date codes and test extremely close to one another on our calibrated modern and professional Amplitrex AT-1000 Tester. 2% Plate Current Match, exact Gm Match.
For reference we generally see plate current between 40-60% for NOS tubes on the Amplitrex. (This value can vary due to different internal construction).
We test all of our 6550s with 450V on the plates. Results are written in the following format.
Plate Current % of NOS Spec / Gm % of NOS Spec - Plate Current in mA
Tube 1: 53% / 92% - 32.3 mA
Tube 2: 51% / 92% - 31.0 mA
Item |
Included |
Original Box |
Yes Included |
Manual |
Not Applicable |
Remote |
Not Applicable |
Cables |
Not Applicable |
Physical Condition |
9 / 10 |
Working Condition |
10 / 10 |
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