I replaced the 0.047uF capacitor and hey presto it was gone !! The signal capacitor tested as good and the right value on the LRC bridge but the tester only tests at around 12 volts. I tested the components on my LCR bridge and they all came up as the right values. I could see the amplitude of the horrible signal on the oscilloscope I grounded the grid of the valve as this input is floating and turned the reverb control while looking at the output of the stage via the signal capacitor. I isolated it down to the Reverb valve ( pretty obvious really !). The built in version has no foot switch control on this attenuator. This feature is available as a pedal and is more flexible as you can switch it via the foot pedal. The Mk2 also has and Iron Man Compensated attenuator fitted and the control is on the back of the amp. I somewhat fear for the Mk1 if a valve base needs to be replaced as it will be highly challenging. This is much better and makes for much easier fault finding and repair. There is now a Mk2 version and this is built on a hybrid style of component mounting which is a combo of a simple printed circuit board with turret type component mounting. The amp I can describe as having more bite and edge than a Deluxe Reverb.
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