When ordering from the US, parcels may be subject to import tax and duty charges, which the buyer is responsible to pay. NEW Old Stock LOT Amps Diodes Detector Board Spectrophotometer # 2N5555 741 TC This product data sheet is originally written in English. NEW Old Stock LOT Amps Diodes Detector Board Spectrophotometer # 2N5555 741 TC This is good to go diodes amps. not sure what it was used for if you know please let me know!!! I know this is rare and this price is probably good deal since you cannot find these anywhere. FREE USA SHIP // Will ship international. NEW Old Stock LOT Amps Diodes Detector Board Spectrophotometer # 2N5555 741 TC This is good to go diodes amps. not sure what it was used for if you know please let me know!!! I know this is rare and this price is probably good deal since you cannot find these anywhere. FREE USA SHIP // Will ship international. Brand Spectra Physics Model amplifier MPN lm Country/Region of Manufacture United States