Offered is a pair of type 837 tubes. They are as follows: RCA VT-101, date code: SC-278A and K5E and Westinghosue US Navy CWL-837. The tubes each test good on the Heathkit tester and they show no shorts. They have black plates and side getters with good silver flashing. Firm bases, clean pins. These types were used in low and medium power transmitters, nowadays they are popular in single-ended audio amps. Plate dissipation: 12 Watts. Pick up these two for your own equipment. NO RESERVE!! Thanks for looking.