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The LS6A, originally produced in 1929, was capable of an audio output of 5.0 Watts. The LS6A has a 25 Watt dissipation anode and so in Class A one would have expected 7 - 8 Watts and in AB1 or B considerably more, perhaps up to 20 Watts. The LS6A was the valve that was developed into the PX25.
The glass is etched in two places, one site features the words Osram Valve and BVA whilst the second area is circular with made in England around the outside and LS6A and 6.0V within. This exhibit has the evacuation pit at the topof the bulb, later production hsd a smooth dome and was evacuated through the stem.
The rear view of the anode. The moulded Bakelite base and split pins are clearly visible. The glass rod support seen at the top of the anode extends the width of the anode plates. The anode is attached to strong angle supports that extend down to the stem below the pinch. A collar with nut and bolt fixing completes the rigid anode support. The filament is M shaped and the two halves are connected in parallel.
The side view of the electrode assembly shows that the anode is much smaller front to back than side to side. The glass rod electrode support to the side of the anode can be seen to be joined to the pinch.
The balloon envelope is 62 mm in diameter, and excluding the B4 base pins is 139 mm tall.
Pin Connections
The glass is etched in two places, one site features the words Osram Valve and BVA whilst the second area is circular with made in England around the outside and LS6A and 6.0V within. This exhibit has the evacuation pit at the topof the bulb, later production hsd a smooth dome and was evacuated through the stem.
The rear view of the anode. The moulded Bakelite base and split pins are clearly visible. The glass rod support seen at the top of the anode extends the width of the anode plates. The anode is attached to strong angle supports that extend down to the stem below the pinch. A collar with nut and bolt fixing completes the rigid anode support. The filament is M shaped and the two halves are connected in parallel.
The side view of the electrode assembly shows that the anode is much smaller front to back than side to side. The glass rod electrode support to the side of the anode can be seen to be joined to the pinch.
The balloon envelope is 62 mm in diameter, and excluding the B4 base pins is 139 mm tall.
Pin Connections
The rear view of the anode. The moulded Bakelite base and split pins are clearly visible. The glass rod support seen at the top of the anode extends the width of the anode plates. The anode is attached to strong angle supports that extend down to the stem below the pinch. A collar with nut and bolt fixing completes the rigid anode support. The filament is M shaped and the two halves are connected in parallel.
The side view of the electrode assembly shows that the anode is much smaller front to back than side to side. The glass rod electrode support to the side of the anode can be seen to be joined to the pinch.
The balloon envelope is 62 mm in diameter, and excluding the B4 base pins is 139 mm tall.
Pin Connections
