The 5654W is the special quality version of the 6AK5 and is also known as the 6AK5W. It is an wideband RF amplifier pentode for VHF and above. The rugged construction is to allow the valve to operate in situations of vibration and knocks and the W suffix denotes this quality. However, this exhibit lacks the double micas usually associated with vibration resistance.
The anode with small screens above and below the mica discs.
The anode is stitched together. The three wire grids are clearly seen with the suppressor grid as an open wound helix.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 37 mm tall.
References: Data-sheet & 1040. Type 5654W was first introduced in 1954. See also1954 adverts.
