ORTEC (AMETEK)
ORTEC
ORTEC 276
PMT base with preamplifier
- PMT compatibility
- 10-stage, 14-pin; JEDEC B14-38
- Weight
- 0.65 kg net
9 referenced values
Bild: ORTEC
ORTEC 276L
Low-power PMT base with preamplifier
PMT base with integral low-noise preamplifier, low-power voltage divider and focus control for scintillation detectors, ideally NaI(Tl). The preamplifier output is used for energy analysis and the anode output for timing or auxiliary energy analysis; a test input accepts pulses from a pulse generator.
- PMT compatibility
- 10-stage, 14-pin; TRW 3B14 socket (JEDEC B14-38); directly compatible with many integrated NaI-PMT assemblies1
- Conversion gain
- Nominally 5 µV/eV with a 2 × 2 in NaI(Tl) crystal and PMT gain of 10⁶1
- Weight
- 0.65 kg net1
Download product sheet (PDF)All values with references – for tender documents
Specifications checked against the manufacturer’s documents on 2026-10-17
Overview
Key features
- Directly compatible with many integrated NaI-PMT assemblies
- Diode protection network for the internal transistors
- Test input for calibration and system testing
Specifications
The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.
Detector
| PMT compatibility | 10-stage, 14-pin; TRW 3B14 socket (JEDEC B14-38); directly compatible with many integrated NaI-PMT assemblies1 |
|---|
Performance
| Integral nonlinearity | <±0.02% from 0 to +10 V1 |
|---|---|
| Output noise | <50 µV rms with an ORTEC main amplifier (e.g. Model 672) and 1 µs time constant1 |
Electronics & signal
| Preamplifier | Integral low-noise preamplifier, dc-coupled positive output (Z₀ = 93 Ω) for energy analysis1 |
|---|---|
| Voltage divider | Total 5.6 MΩ, giving a bleeder current of 200 µA at a typical 1 kV; linear distribution to all stages1 |
| Detector bias | External positive high voltage: +2,000 V maximum (SHV); observe the rated voltage of the installed tube1 |
| Output rise time | <100 ns for test input or fast scintillator1 |
| Conversion gain | Nominally 5 µV/eV with a 2 × 2 in NaI(Tl) crystal and PMT gain of 10⁶1 |
| Signal outputs | Preamp: positive pulse, Z₀ = 93 Ω, dc-coupled (BNC); anode: negative pulse for timing or auxiliary energy analysis, Z₀ = 1 kΩ, ac-coupled (BNC)1 |
Power & battery
| Power supply | Preamplifier: +24 V, 16 mA and −24 V, 16 mA via a captive 4 m cable (Amphenol 17-20090); compatible with all ORTEC main amplifiers and the 4002P1 |
|---|
Environment & ratings
| Temperature instability | <±0.005%/°C, 0 to 50 °C1 |
|---|
General
| Decay time | 50 µs time constant1 |
|---|
The data comes from the manufacturer’s published documents. Manufacturers may change specifications; the current configuration and performance are confirmed in the quotation.
Documents
Sources
The number after each value refers to the source listed below. Values are as published by the manufacturer; the exact configuration is always confirmed in our quotation.
- 1
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- PMT compatibility
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- Weight
- 0.63 kg net
6 referenced values
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- PMT compatibility
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- Weight
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6 referenced values
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Oscar ÅgerstamFounder & CEO