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GE 6550 / 6550A - matched pair

GE 6550 / 6550A - premium matched pair
Manufacturer: GE
The late 1970s GE 6550A power tubes in this precision matched pair have gray plates, 3 getters, and metal collar bases. The white print on the glass has the GE logo and 188-5 factory code (Owensboro, Ky). The glass is etched with "6550A U.S.A." and the dot pattern characteristic of GE tubes. See "product options" for photos and more information about each pair.

Tubes test as new and are precisely matched for both transconductance (Gm) and plate current (mA). They ship in new white boxes. It is very hard to find matched pairs of vintage power tubes like these--grab them while supplies last!
 
These tubes are sold as premium matches. Photos are sample pairs from the lot.

Precision Power Tube Matching

Our power tubes are burned in for 48 hours and tested on a laboratory grade Amplitrex AT1000 tube tester (fixed bias mode, manual setting). They are screened for shorts, gas, leakage, and noise. We test and match tubes for both current draw (mA) and transconductance (Gm) at typical operating conditions for no extra charge.

The questions listed below allow you to provide information about your operating conditions that will help us select the best matched set of power tubes for your amplifier. Why this matters
1. What is the manufacturer and model of your amplifier?
2. How is your amp biased?   Why we ask
3. Choose the matching option you prefer:  Why we ask
4. CUSTOM MATCHING ONLY: If you chose "Custom Match" above, please enter the power tube specifications for your amp
Plate Voltage
Screen Voltage
Matches:
Price per matched set: From $197.00 to $214.00
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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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