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The DH from M-OV is an indirectly heated triode and dates from 1931. The Osram label is stuck to the envelope.
The anode is made of mesh and is welded to the support rods. The grid is just visible inside the mesh anode.
The shaping of the mesh anode is revealed. The grid can be seen between the top of the anode and the top mica. Above the mica can be seen the twin insulated strands of the filament held by the rod. The etched markings are visible but the type designation is not visible.
In this enhanced image the faint etched marking of the DH can be seen. With the eye the identification of this valve is difficult.
The triangular top mica, and in this close-up the grid wire is clearer.
The balloon envelope is 50 mm in diameter, and excluding the B5 base pins is 108 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
16.0
0.25
This exhibit was last updated on 30 March 2008
The anode is made of mesh and is welded to the support rods. The grid is just visible inside the mesh anode.
The shaping of the mesh anode is revealed. The grid can be seen between the top of the anode and the top mica. Above the mica can be seen the twin insulated strands of the filament held by the rod. The etched markings are visible but the type designation is not visible.
In this enhanced image the faint etched marking of the DH can be seen. With the eye the identification of this valve is difficult.
The triangular top mica, and in this close-up the grid wire is clearer.
The balloon envelope is 50 mm in diameter, and excluding the B5 base pins is 108 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
16.0
0.25
This exhibit was last updated on 30 March 2008
The shaping of the mesh anode is revealed. The grid can be seen between the top of the anode and the top mica. Above the mica can be seen the twin insulated strands of the filament held by the rod. The etched markings are visible but the type designation is not visible.
In this enhanced image the faint etched marking of the DH can be seen. With the eye the identification of this valve is difficult.
The triangular top mica, and in this close-up the grid wire is clearer.
The balloon envelope is 50 mm in diameter, and excluding the B5 base pins is 108 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
16.0
0.25
This exhibit was last updated on 30 March 2008
In this enhanced image the faint etched marking of the DH can be seen. With the eye the identification of this valve is difficult.
The triangular top mica, and in this close-up the grid wire is clearer.
The balloon envelope is 50 mm in diameter, and excluding the B5 base pins is 108 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
16.0
0.25
This exhibit was last updated on 30 March 2008
The triangular top mica, and in this close-up the grid wire is clearer.
The balloon envelope is 50 mm in diameter, and excluding the B5 base pins is 108 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
16.0
0.25
This exhibit was last updated on 30 March 2008
The balloon envelope is 50 mm in diameter, and excluding the B5 base pins is 108 mm tall.
Absolute Maximum Operating Conditions
Triode
Vh
Ah
16.0
0.25
This exhibit was last updated on 30 March 2008
Absolute Maximum Operating Conditions
Triode |
Vh |
Ah |
16.0 |
0.25 |
This exhibit was last updated on 30 March 2008
This exhibit was last updated on 30 March 2008 |