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Engineers Notes
These notes are only intended for use by an
engineer qualified to work with high voltages found
in valve amplifiers. Owners should refer any
problems to a dealer or service agent.
The amplifier may be inverted by supporting the
transformers on non abrasive surface (e.g. dense
foam, books etc) which allows space between the
KT120 and the work surface.
Safety
Before removing base disconnect the power cord.
Always allow 10 minutes for the HT to discharge, or
measure before proceeding. If possible use a bleed
resistor of around 5-10KΩ will speed this up, and
check that the HT voltage has discharged.
Amplifier dead.
Check the 20mm mains fuse in the IEC socket at
rear of the amplifier, if dead there is a spare
included. Or the fuse in the plug (if applicable). If
not either check in-line power switch fuse adjacent
to IEC socket.
230v to 115v Conversion.
Take the precautions as above. It is necessary to
change the primary power windings from series to
parallel. This can be achieved by unsoldering the
"live" input from the IEC socket and replacing it with
the two "centre tap" connections normally found
insulated with "heat shrink". The single removed
wire should be connected together with the "neutral"
connection on the IEC socket. A The IEC socket AC
fuse should be doubled in value.
Page 10
*See engineers notes at rear
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