Mesa Rectoverb Head Problems....

Updated
5150-Viper
i've noticed recently that the modern channel (highest gain channel) is quite noisy whether im plugged in or not (rules out the guitar). Kind of a static, crackling, hum sound. The louder i turn up the volume (unplugged) the louder it obviously gets, im thinking maybe a preamp tube is the cause but im not quite sure. any help would be appreciated on what the possible problem could be
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