This listing is for 2 matched and balanced 6080WB tubes NOS JAN Sylvania with Triple Mica and black plates. 

Tested for Noise and Balance in dark voice headphone amplifier. Condition is "New". Shipped with USPS First Class. One year replacement warranty.

On my  B&K tester:    Below 55 = BAD      55-66 = ?     65 -100 = Good     100-120+ = NOS

Each tube is tested in the dark voice headphone amplifier for Symmetrical Output.

Photo shows tube being tested in headphone amp.

Using a Kenwood 3 channel 40 MHz scope with 56 ohm load resistors on each channel,

At 2 Volts RMS output. With  330 mV input signal at 1K  and 10K

If the tubes do not produce symmetrical output, soundstage will not be centered

Tubes are guaranteed to meet the Industry standard for a New Vacuum Tube.

Shipping: $4.45 Each Additional: $1.00