16A5
16A5 is also designated PL82.
General
The 16A5 is a cathode-coated unipotential tube, described by the Philips datasheet as a power pentode. It is an all-glass miniature tube with a small button noval 9-pin base and a T61 bulb.
Construction
The 16A5 uses indirect heating with an oxide-coated cathode. The suppressor grid is internally connected to the cathode. The tube has a JETEC basing designation of 9BL.
Ratings
The heater is rated at 16.5 volts and 300 mA, and is designed for series heating with AC or DC. Maximum ratings include a plate dissipation of 9 watts, a grid No. 2 dissipation of 2.5 watts, a cathode current of 75 mA, a plate voltage of 450 volts, and a grid No. 2 voltage of 200 volts. The maximum grid No. 1 circuit resistance is 0.4 MΩ with fixed bias and 1 MΩ with automatic bias. The maximum voltage between cathode and heater is 200 V, and the maximum external resistance between cathode and heater is 20 kΩ.
Characteristics
The Philips datasheet gives an amplification factor of 10.8 and an internal resistance of 20 kΩ for the 16A5. Input capacitance is 12.5 pF, output capacitance is 5.5 pF, and feedthrough capacitance is less than 0.5 pF.
Physical Properties
The maximum overall length is 3 1/16 inches, and the maximum seated height is 2 13/16 inches. The bulb length, excluding tip, is 2 7/16 inches ± 3/32 inches, and the maximum diameter is 7/8 inch. The maximum weight is 16 g. The 16A5 can be mounted in any position.
Applications
According to the Philips datasheet, the 16A5 is intended as an output stage for vertical deflection or as a low-frequency amplifier.
| Designation | Evidence | Confidence |
|---|---|---|
| PL82 | 59 independent documents | confirmed |
Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.
Original manufacturer datasheets for 16A5, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Philips | 16A5 | PDF (484 KB) |
| Tesla | PL82 | PDF (3161 KB) |
| Philips | PL82 | PDF (842 KB) |
| Mazda-Belvu | PL82 | PDF (252 KB) |
| La Radiotechnique | PL82 | PDF (99 KB) |
Documents held here and used to write this page.
- KONCOVÁ PENTODA (filed under PL82)
- 16 A 5 PHILIPS
2 further designations appear alongside 16A5 in the literature but below the evidence threshold used here, so they are not listed as equivalent.