Specialized - Cathode Ray ·CathodeRay
3QP1
North American Philips 3QP1 oscilloscope CRT with electrostatic focus and deflection, green medium-persistence P1 screen, 6.3 V 0.3 A heater and 1500 V maximum accelerating anode rating.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 9
- Nominal heater
- 6.3 V / 300 mA
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Cathode Ray
- Max plate voltage
- 1500 V
North American Philips 3QP1 electrostatic-focus/deflection oscilloscope CRT with P1 green medium persistence screen. Max anode2 accelerating voltage 1500 V, anode1 focusing 700 V, negative control grid bias magnitude 125 V, heater-negative-to-cathode 125 V, grid resistor max 1.5 MΩ, deflection electrode circuit resistance max 3 MΩ. Typical Va2 800/1200 V, anode1 focus 200–320/240–380 V, grid cutoff -21 to -50/-31 to -74 V. D1-D2 deflection factors 143–193/214–290 V/in, D3-D4 ~90–121/133–181 V/in. Approx capacitances pF: cathode-all ~10 (OCR ambiguous), grid-all 9, D1-D2 2, D3-D4 2, D1 excluding D2 7, D2 excluding D1 7, D3 excluding D4 5, D4 excluding D3 6. 9-pin loctal, basing designation provisionally 9D, canonical ID unverified. Preliminary source may contain incomplete ratings.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.