RCA JAN-CRC-872A / VT-42A — Military Grade NOS
High Voltage Rectifier
U.S. Army/Navy (JAN)
Jumbo 4-Pin Bayonet
10,000V PIV
Constant 10V Drop
Up for sale is a heavy-duty pair of RCA JAN-CRC-872A (VT-42A) half-wave mercury-vapor rectifier tubes. These are essentially an upsized, high-power version of the 866A, designed for demanding high-voltage power supplies in industrial and radio transmitter equipment.
These professional-grade tubes are renowned for their ability to handle up to 10,000 Volts (PIV) while maintaining a remarkably low and constant internal voltage drop of approximately 10V. These units feature the signature Jumbo 4-Pin Bayonet base and are designed for vertical, base-down operation.
| Technical Parameter | Specifications | Operational Requirement |
|---|---|---|
| Filament Ratings | 5.0 Volts / 7.5 Amperes | Minimum 30s preheat required |
| Peak Inverse Anode Voltage | 10,000 Volts (Max) | Optimal at 20° – 60°C |
| Anode Current | 5.0A Peak / 1.25A Average | Blue glow visible during operation |
| Physical Mounting | Jumbo 4-Pin Base / Medium Cap | Must be mounted vertically, base down |
About NOS Audio Tubes
We specialize in laboratory-tested, high-quality vacuum tubes. Since the 1970s, our Mumbai-based facility has managed an inventory of over 300,000 valves, verified using professional testers like the Amplitrex AT1000 and AVO Type 160.
Note: Custom duties and taxes are the responsibility of the buyer in their country.
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