Hmm... yeah I see where you're coming from, but it is putting out 1.5V so I'm a bit confussled why it's doing that.... anyway I'll check the primary windings resistance later and let you know. Don't fancy trying to pull the transformer to bits though, as it's casing looks a bit difficult to get into, and there's glue everywhere..... I understand you can't just calculate the required voltage from the power consumption, but I thought someone might've had experience with this amplifier, or maybe have some schematics I could refer to...