The 6146 is a very popular small transmitting beam tetrode valve normally used in pairs within HF transmitters of 100 W output. This exhibit was made by Brimar in England.
The 6146 dates from the era of AM as well as the early days of SSB. For AM a high level modulator was required and a pair of 6146's would provide the audio to modulate the HT for the PA valves.
The original label has the date March 8, 1977 and it was re-tested in 1990.
The anode connection from the top cap passes to the side flanges of the anode. The rest of the connections are shielded from the anode.
The wide glass tube envelope is 38 mm in diameter and excluding the IO base pins, the valve is 80 mm.
References: Data-sheet & 1040. Type 6146 was first introduced in 1952. See also1952 adverts.
