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PY500A tube: datasheets and technical data
Explore available pinout, electrical data and related types for the PY500A vacuum tube.
The PY500A is a booster diode for the timebase circuits of colour television receivers. The Philips sheet places it in deflection circuits and permits one-way replacement of the PY500 in existing circuits; this does not claim reciprocal interchangeability without checks. It has a nine-contact Magnoval base and a cathode connection on top of the envelope.
The cathode is indirectly heated and the heater is intended for a 300 mA series chain; Philips specifies a nominal 42 V. The same sheet requires a minimum external resistance between each heater pin and the mains terminals: 100 Ω with 220 V rms between heater and earth, or 50 Ω with 110 V. The hot resistance of other heaters in the chain may also contribute. This constraint matters when changing the order of tubes in a television without a mains transformer.
Philips gives design limits of 11 W plate dissipation, 440 mA average plate current and 1000 mA peak current. The provisional Telefunken sheet instead limits the peak to 800 mA, so a particular tube must be assessed against its manufacturer's data. Both give 5.6 kV as the negative peak plate-voltage limit and 7 kV as an absolute maximum; these ratings concern pulses no longer than 22% of the cycle and, in any case, 18 µs. The absolute maximum is not a normal operating value.
Tube images
Pinout and connections
Base: Magnoval 9-pin (B9D) (9 pin)
| Pin | Function |
|---|---|
| 1 | tc |
| 2 | ic |
| 3 | a |
| 4 | ic |
| 5 | h |
| 6 | h |
| 7 | ic |
| 8 | a |
| 9 | a |
Electrical data
Heater
- Heater voltage Vh
- 42 V
- Heater current Ih
- 0.3 A
Interelectrode capacitances
- Anode-to-cathode capacitance Cak
- 12.5 pF
Datasheet PDF
| Language | Pages | Manufacturer | |
|---|---|---|---|
| PY500A.pdf | en | 4 | Philips |
| PY500A.pdf | en | 3 | Telefunken Deutschland |
| PY500A.pdf | fr | 1 | Mazda |
EL84 ECC83 12AX7 EL34 6L6GC 300B KT88 GZ34
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