PVS-14 Tube Options — Gen 3 Image Intensifiers

FOM is the single number most buyers use to compare tubes. It's calculated as Signal-to-Noise Ratio (SNR) multiplied by resolution (lp/mm). A tube with SNR 25 and resolution 64 lp/mm has a FOM of 1,600. Higher is better — but FOM doesn't tell the whole story.

SNR is the more important of the two components for real-world performance. A tube with high SNR but lower resolution will look cleaner and perform better in very low light than a tube with a high resolution number but lower SNR. When you see two tubes with similar FOM, the one with the higher SNR is usually the better choice for tactical or hunting use.

All Gen 3 tubes use a GaAs photocathode. The difference is whether that photocathode has an ion barrier film applied. Early Gen 3 tubes used a thin film to protect the photocathode and extend tube life. The tradeoff is slightly reduced sensitivity — the film absorbs a small percentage of incoming photons.

Filmless (or "unfilmed") tubes remove the ion barrier film. The result is meaningfully better low-light sensitivity — roughly equivalent to a 10–15% increase in effective performance. The tradeoff is that filmless tubes tend to have shorter service lives under hard use, though modern manufacturing has largely closed that gap.

For most buyers: if the application involves extended field use and longevity matters, thin-film is the safe choice. If you want maximum performance and the system will see professional maintenance, filmless is the better tube.

White phosphor (P45 screen) renders the image in grayscale. Green phosphor (P22) renders in the familiar green. The performance case for white phosphor is well established: sharper edge contrast, better target discrimination, and reduced eye fatigue over long sessions. All new production tubes Adams Industries installs are white phosphor.

Green phosphor tubes still have their place — they're available at lower price points in remanufactured configurations, and some users simply prefer the familiar green image. But for a new build in 2026, white phosphor is the default unless you have a specific reason to go green.

More on white phosphor PVS-14 configurations →

Autogating (also called auto-gating or gated) refers to a power supply that rapidly cycles the tube's high voltage in response to bright light sources. Without autogating, a bright light in the field of view — a muzzle flash, a streetlight, a vehicle's headlights — will bloom out and temporarily blind the tube. With autogating, the power supply reacts fast enough to prevent bloom, keeping the image usable.

All new production tubes Adams Industries installs are autogated. For remanufactured or legacy tubes, autogating status is specified per unit. If you're buying a tube for tactical or law enforcement use, autogating is non-negotiable.