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Sansui amplifier A-707

I could only find the spares at a unaffordable price in SA. Now I am installing ILP monoblocks and doing some changes. I, however find that the tone control was connected onboard onto the preamp. This will call for a redesign of the active tone control. I also do not have the cct digram for the amp. Are you able to assist me with at least a cct diagram? For the tone control I might use the Lf 353 ic's.

Any comment??!!

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