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Hi Pete
The input stage transistors in the AP1 & AP2 were matched although without reviewing the schematics I couldn’t tell you the parameters. It was to balance the positive & negative signal gain. The resistor tolerances were 5%. Today it is just as cheap to fit 1%
To answer the other question there are much better transistors available today that would really improve the performance of these amplifiers. Unfortunately you can’t just substitute & expect improvements. The open loop response would change & the compensation capacitors would need to be recalculated
Best wishes
Stan
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On Dec 2, 2019, at 3:14 AM, Stan Curtis <ma...@stancurtis.com> wrote:To answer the other question there are much better transistors available today that would really improve the performance of these amplifiers. Unfortunately you can’t just substitute & expect improvements. The open loop response would change & the compensation capacitors would need to be recalculated
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