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Old 16th Jan 2008, 8:38 pm   #4
Ed_Dinning
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Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,173
Default Re: Quad 2 Valve power amp questions

Hi Paul, fusing is usually in the centre tap lead of the HT winding as well as on the mains input side; this protects against most faults, say 1A for the mains and 150/250mA for the HT.
39C is not that hot. Typically the hot spot temp is allowed to 120C max.
If you really want to reduce it you could add an external heater transformer and disconnect the heater wires from the normal one.

Ed
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