The English Electric C1134 is a VHF double beam tetrode transmitting valve introduced in the early 1950s.
The heater runs at 6.3 Volts when both halves are in parallel or 12.6 Volts when in series. For 6.3 volts pins 1 & 7 are connected together with pin 5 as the other end. For 12.6 Volt operation the voltage is connected to pins 1 & 7 with pin 5 left unconnected.
In addition to use as transmitter power amplifiers the upper frequency of 600 MHz made them popular for frequency multiplication.
This exhibit is a factory reject that escaped destruction.
The EE logo on the glass and inside are the incorrectly placed anodes. The bad placement allows the beam plates and central structure to be clearly seen.
The envelope has the maker's name and made in England on it but within it can be seen that the anodes are fixed to the supports in totally the wrong position. Looking at C1134 shows the correct positioning on the supports.
Here the precision of the grid alignment is clear. There are four wires visible - the double sided screen grid and the pair of single sided control grids. Aligned grids reduce screen grid consumption.
From the side the anode can be seen to be really badly fitted.
The milky patch inside the envelope indicates that the vacuum has failed.
The wide glass tube envelope is 44 mm in diameter and, excluding the B7A base pins is 69 mm tall.
References: Data-sheet & 1040. Type C1134 was first introduced in 1974. See also1974 adverts.
