The 803 or VT-106 is a 125 watt pentode that was usable up to 20 MHz at full ratings. The first example is an RCA and the second and third were made by Westinghouse. Westinghouse tubes were made with both white and brown bases. The white Westinghouse bases have a rough surface. This was an early transmitting tetrode but lost popularity in its niche when the 813 was introduced. The 813 is smaller, more powerful, a beam pentode and could operate to 30 MHz. First marketed by RCA in 1935.
Length = 9.00" Diameter = 2.25"
Max voltage = 2000
Max current = 160 ma
Fil voltage = 10
Fil current = 5 amps