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Gold Aero 6550 - matched quad
The 1987 Gold Aero 6550A tubes in this precisely matched quad have coke bottle shaped glass, black plates with extra support rods, and metal collar bases. The gold print on the glass has the Gold Aero logo and matching date codes (missing on one tube).
All four tubes have been screened for gas, heater-cathode leakage, shorts, and excessive noise and microphonics. They have been tested at typical operating voltages on a laboratory grade
Amplitrex AT1000 (manual setting, fixed bias mode) and matched for both current draw (67.0-68.6 mA) and transconductance (112%-115% Gm). Learn more about our testing and matching process here.
Tubes ship in new white boxes with test results for each tube. |
Precision Power Tube Matching
Our power tubes are burned in and then tested on a laboratory grade Amplitrex AT1000 tube tester. We match tubes for both current draw (mA) and transconductance (Gm) at typical operating conditions (plate: 500V, screen: 300V, grid bias: -30.5V).
After burn in and testing, we hand select and custom match every power tube order we receive. To do this, each power tube set is also run on a custom, fully variable test fixture that can match the operating conditions of your amplifier based on the information you provide below. This enables us to do a final check of the power tube set's performance and matching under load.
Why this matters
1. What is the manufacturer and model of your amplifier?
2. How is your amp biased? Why we ask
3. Matching notes Why we ask
If you know the plate, screen, and grid bias voltages your amplifier uses, please note them in the comments section when you check out and we will use this information when we select and match your power tube set. (If you don't know, don't worry--we can make an educated guess based on your amp's make and model, if we don't already know the voltages it uses.) If you are a guitarist, you can also specify if you prefer early or late breakup. Thanks!
CAUTION
Price per matched set: $249.00
1 matched quad
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TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.
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