19X3
19X3 is also designated PY80.
Description
The 19X3 is a booster diode with an indirectly heated unipotential cathode. It has a small button noval 9-pin base and a T61 bulb type.
Construction
The maximum overall length of the 19X3 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 inch, with a maximum diameter of 7/8 inch. The JETEC basing designation is 9BM. The tube may be mounted in any position.
Ratings
The heater requires 19 volts at 300 mA. The direct interelectrode capacitance from plate to cathode is 5.5 pF. Maximum ratings include a peak inverse plate voltage of 4000 volts, a peak plate current of 400 mA, and an average plate current of 180 mA. The maximum peak heater-cathode voltage is 650 volts with the cathode positive with respect to the heater.
Operating Notes
The datasheet instructs that pins 1, 2, 6, 7 and 8 should not be connected externally. It also notes that the duration of the voltage pulse must not exceed 18% of one cycle and must be limited to 18 microseconds.
| Designation | Evidence | Confidence |
|---|---|---|
| PY80 | 45 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 19X3, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Philips | 19X3 | PDF (91 KB) |
| Philips | PY80 | PDF (195 KB) |
Documents held here and used to write this page.
- PY80 (filed under PY80)
- 19X3
1 further designation appears alongside 19X3 in the literature but below the evidence threshold used here, so it is not listed as equivalent.