loud humming from mc7r preamp

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Hi everyone,i have owned my mc7r preamp now for over 1 year and am very happy with it .the sound is very open fast and with some new tubes on it it sounds even better O yes and tight bass too.Anyway for the last 4 months i have had a humming noise from it ,which has been getting louder by the month.i thought it might be a earth problem ,also last week when i put my hand on the external capacitor the humming droped alot .PLEASE can someone help me .thanks.🙁🙁🙁😡

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