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The RCA 1638 is a double diode for signal rectification or other low level duties. The glass envelope has been screened with an external copper metalisation that has then be painted bright red.
The diodes are rated for signal use, but it does not appear to be a low capacitance type.
The metalisation obscures the internal structure completely. Radiotron is an RCA trade name.
These valves were made for British service use and the envelope carries the RAF code VR54 as well.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins, is 59 mm tall.
Pin Connections
The diodes are rated for signal use, but it does not appear to be a low capacitance type.
The metalisation obscures the internal structure completely. Radiotron is an RCA trade name.
These valves were made for British service use and the envelope carries the RAF code VR54 as well.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins, is 59 mm tall.
Pin Connections
The metalisation obscures the internal structure completely. Radiotron is an RCA trade name.
These valves were made for British service use and the envelope carries the RAF code VR54 as well.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins, is 59 mm tall.
Pin Connections
