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Around 1970, the 2000 amplifier was redesigned. The redesign was available as the System 2000 Mark 2 and as the System 3000. Circuits of these were very similar! Unfortunately I do not have the details of the System 3000, only of the 2000 and a page detailing the differences. This page lists the main differences, as below - but this is partly guesswork.
I believe the circuit was printed on the reverse of the instruction card - if you have a copy, please let me know.
|Feature||System 2000||System 3000|
|Rectifier||2 diodes||Bridge rectifier|
|C24||2000µ 30v||1000µ 63v|
|Power supply||No stabilizer||Stabilised|