The Rex Amplification Bass king BA100 Full restoration rpoject
A true barn find found in rural Victoria Australia. A labour of love indeed. The BA100 Bass king. Made in Australia in the late 60's or early seventies. A rare model. Manufactured by Frank and Anthony Lamberti of General Music which was a division of Lamberti Brothers in Melbourne. No documentation could be found for this circuit but it is basically a clone of an early baseman. The amplifier came in with valves rolling around inside the cabinet. Screws and washers rolling around inside the chassis, and a vast amount of rust and oxidation and dirt. The amplifier still has the original made in Australia 12 AX7 Pre Amp valves installed and, they test good and sound great. They have had very little hours put on them. The back panel is missing and has been replaced by an acrylic panel.
The mains wiring is a little scary and will need to be brought up to current standards. We started by mapping out the wiring and component layout then, clipping out the components and saving them for testing. All of the electrolytic capacitors were discarded and will be replaced. The chassis was striped bare and the rust treated then repainted. Tag strips replaced where required. Almost all of the old wiring had suffered from the green death sludge that we see from time to time. It will be replaced with new wiring. We were able to use all the existing valves . The amplifier is brutally loud with tons of clean head room and whisper quiet. No hum, buzz or hiss. Incredible.
Before The Resetoration
After Restoration
Using most of the old components where possible, The amplifier was re assembled. All new electrolytic capacitors, and many new resistors. Most of the wiring was replaced with high quality PTFE stranded wire. We also installed a custom fabricated aluminium shielding box to shielded the input section from the phase inverter. It spans both channels of the front panel controls. The old shield was not doing the job. A new dedicated earth bond point was installed and an IEC mains socket provided for safe connection to the mains.
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