Rectifier - Half Wave ·Rectifier
Low-filament-power directly heated half-wave high-vacuum rectifier for small-current high-voltage supplies, providing approximately 4.3 kV peak inverse-voltage capability.
The 1664 is a filamentary half-wave high-vacuum rectifier tube designed for low-current, high-voltage applications. It is characterized by an extremely low-power filament, requiring only 1.4 V at 0.05 A. The tube is designed with a T-X outline and utilizes a 2Z base connection configuration. It is rated for a maximum peak inverse voltage of 4,300 V and a maximum DC output current of 1.0 mA, making it suitable for specialized high-voltage rectification where power conservation is critical.
The 1664 features a filamentary cathode ("Fil") rather than an indirectly heated cathode. This direct-heating design allows for rapid warm-up and highly efficient thermal operation.
This extremely low filament power consumption of 70 mW is a key feature of the 1664, allowing it to be operated in circuits with very limited power budgets.
The tube is housed in an envelope defined by the T-X outline drawing. It utilizes the 2Z base connection diagram, which is configured as follows:
This physical separation between the filament terminals at the bottom and the plate terminal at the top provides excellent electrical isolation, which is essential for preventing high-voltage breakdown or arcing between the high-potential anode and the low-potential filament circuit.
The 1664 is designed specifically for half-wave rectifier service. Its electrical ratings are optimized for high-voltage, low-current power supplies. The maximum ratings and typical operating parameters for this service are:
| Parameter | Value |
|---|---|
| Maximum RMS Supply Voltage | 1,500 V |
| Maximum Peak Inverse Voltage (PIV) | 4,300 V |
| Maximum Peak Plate Current | 6 mA |
| Maximum DC Output Current | 1.0 mA |
These specifications indicate that the 1664 is intended for high-voltage, high-impedance circuits. The low maximum DC output current of 1.0 mA and peak current of 6 mA restrict its use to applications such as electrostatic focus supplies, cathode-ray tube biasing, or other low-current, high-voltage anode supplies where efficiency and high-voltage isolation are paramount.
The 1664 is a half-wave high-vacuum rectifier featuring a 1.4 V, 0.05 A filamentary cathode, a T-X outline, and a 2Z base connection. It is designed to operate with a maximum RMS supply voltage of 1,500 V and can withstand a maximum peak inverse voltage of 4,300 V. Under these conditions, it delivers a maximum DC output current of 1.0 mA with a maximum peak current of 6 mA. The physical separation of its plate and filament connections, combined with its exceptionally low calculated filament power of 0.07 W, makes it an efficient choice for high-voltage, low-current rectification.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Promoted from printed maximum-rating/characteristic columns; additional published values retained in TUBE_SECTION_PARAMETER.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
DC output current maximum
1 mA
HalfWave
Peak inverse voltage maximum
4300 V
HalfWave
RMS supply voltage maximum
1500 V
HalfWave
Peak current maximum
6 mA
HalfWave