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Sylvania 6550 - matched quad

Sylvania 6550 - matched quad
Manufacturer: Sylvania
The 1970s Sylvania 6550 power tubes in this precisely matched quad have welded gray plates, 3 getters, and metal collar bases. The label on the glass has the Sylvania or PhilipsECG logo.
Tubes test as new and are matched for both current draw (mA) and transconductance (Gm). They ship in new white boxes with test results for each tube.

It is very hard to find matched sets of vintage power tubes like these—grab them while supplies last!
These tubes are sold as a matched quad. Photo is a sample 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
Price per matched set: $359.00

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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