BD1 user guide

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We encourage you to learn to get to know it by experimenting with all the controls, in order to discover its vast array of tonal combinations. This will ensure extended valve life and avoid any power-down noise. Please always try to buy matched pairs of output valves as they will be easier to Bias and give longer service. 5A fuse in the UK @ 230V, it will needs to be a 1A fuse for the USA @ 115V). Thank you for making your tones with us: we wish you many years of achieving inspiring sounds to push your playing ever onwards. The amplifier is now in ‘STANDBY’ mode with just the valve heaters and low voltages on. After around 60 seconds, the amp can be switched to either HIGH, (around 28 Watts rms) or LOW, (around 2 Watts rms). Do not be tempted to poke fingers anywhere inside the amp; lethal voltages are present. When switching the amplifier ON or OFF please ensure the Volumes are turned down and you leave at least 30 seconds before switching from Standby to Off. Failure to do this will result in either the mains fuse blowing as soon as the amp is turned on or the amp running with a fuse that is of too higher value to provide adequate safety protection. The RETURN socket is also very useful for fault diagnosis. The SEND socket is for connection to the input of effects units. SAFETY FIRST We want you to enjoy your amplifier to the best of its potential. It will rarely cause any damage so just replacing the fuse is sufficient to get the amp running normally again. The Bias voltage measurement is performed between the chassis, (use the unpainted corner bush as seen in the top right of the above photo) and the test point TP10 & TP11, (yellow squares on photo). This translates into 21mA of current per output valve as we’re measuring across a 1 Ohm resistor. In addition, careful use of the volume control on the guitar will also provide tonal variations to the sound. On the BD1 it is a lower impedance version of the signal that appears at the INPUT. Power switch HIGH – STANDBY – LOW Switch The BD1 should always be switched on, (Power switch on front of amplifier), with this front panel toggle switch in its centre position. Ensure that as you remove them that they are never more than a few degrees from vertical to avoid bending or breaking pins etc