Amp has developed a throbbing hum

ZoolooterZoolooter Frets: 886
The amp runs virtually silent usually. Yesterday, when I switched it on it now has a throbbing hum that definitely was not there before. Also gets louder as you turn it up. The amp is a Bogner New Yorker 2 x 6v6 1x 12ay7 v1 and 1 x 12at7 v2. No onboard effects, volume and tone control only.

Any ideas?? new output valves maybe? never changed the 6V6's and the amp is about 4 years old - but would that cause the hum?
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