Thank youYou should be able to find either a 65 DRRI, or ‘68 CDR, used for a “reasonable” amount. They are solid pro-level amps, sound great, and not too cumbersome.
Though you may not be able to find them used as readily, both the Tone King Imperial mkii, and Magnatone Twightlighter 112 are worth plugging into and strumming a few chords if you ever get the chance.
There seem to be plenty of options so it will come down to money in the end. Most amps mentioned so far are available in Australia so I will just need to be patient.
So the OP is in Australia and asked for suggestions of new for $1000. This is the price in $Aud. Local isn't 5,000 miles so pickup probably not possible. To bring it into Oz, $US200 in customs fees plus maybe $3-400 in freight. Then he'd need a step up transformer for 110-240volts for maybe $100, or a tech to source a transformer and do the work. Maybe $300.
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