Hello Guys

Yes laugh away i bought one of these yesterday im wondering if their is a fault or its normal upon switching the unit off last night from running around 2 hours their was like a discharge screech from my speakers "Nothing Special" after about 15 to 20 seconds of switching the unit off do the valves need replacing or is it a capacitor fault or is it normal "which im doubting"

Working fine otherwise...

Please advice as i know nothing about valves...?

Thank You