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The ATP4 is an audio output pentode with a total anode dissipation of 5 Watts. It functions as a single valve but is formed by strapping two sections in parallel.
The AT in the designation stands for Army Transmitting and this valve was made for British Army use. The MO base indicates that this was supplied by Mazda.
The ATP4 is a low power device and the anodes are left bright. Two complete pentode valves are placed in the envelope.
The space between the pinch and the bottom mica is filled with connections and paralleling straps.
This image shows the central support welded to a U section strap that connects to the individual pentode electrodes. Three such assemblies can be seen as well as the grids in the right hand pentode.
The classic envelope is 39 mm in diameter, and excluding the MO base pins is 96 mm tall.
Pin Connections
The AT in the designation stands for Army Transmitting and this valve was made for British Army use. The MO base indicates that this was supplied by Mazda.
The ATP4 is a low power device and the anodes are left bright. Two complete pentode valves are placed in the envelope.
The space between the pinch and the bottom mica is filled with connections and paralleling straps.
This image shows the central support welded to a U section strap that connects to the individual pentode electrodes. Three such assemblies can be seen as well as the grids in the right hand pentode.
The classic envelope is 39 mm in diameter, and excluding the MO base pins is 96 mm tall.
Pin Connections
The ATP4 is a low power device and the anodes are left bright. Two complete pentode valves are placed in the envelope.
The space between the pinch and the bottom mica is filled with connections and paralleling straps.
This image shows the central support welded to a U section strap that connects to the individual pentode electrodes. Three such assemblies can be seen as well as the grids in the right hand pentode.
The classic envelope is 39 mm in diameter, and excluding the MO base pins is 96 mm tall.
Pin Connections
The space between the pinch and the bottom mica is filled with connections and paralleling straps.
This image shows the central support welded to a U section strap that connects to the individual pentode electrodes. Three such assemblies can be seen as well as the grids in the right hand pentode.
The classic envelope is 39 mm in diameter, and excluding the MO base pins is 96 mm tall.
Pin Connections
