The cryogenic receivers offer the ultimate in sensitivity for any given wavelength range as well as maximum immunity to EMI, microphonics, and accidental mishandling. The standard EOS dewars, side-viewing or down-viewing, can be provided with built-in amplifiers for any of the photodiode or photoconductor components. Depending on the specific detector and sensitivity requirements, parts of the amplifier may be cooled along with the detector. These EOS modules are unique in the industry in providing the ultimate in sensitivity, EMI immunity, and low microphonic noise. The standard units contain switchable gains, BNC outputs, and shielded power connections. Custom options include offset control, additional gain control, and multi-stage amplifiers.