The results of tests of 1 vacuum phototriodes in a magnetic field up to 4.5 T are presented. It was found that output amplitude decreases by about 6 % per tesla in the magnetic field range from 2.0 to 4.0 T. For devices with an anode mesh pitch of 16$mu$m, the output amplitude at 4.0 T is 30 % lower than that at zero field.
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