B.Flat Posted September 19, 2017 Share Posted September 19, 2017 What op.amp changes could I make to a YAMAHA PB1 to improve its performance ? All suggestions gratefully received ! Quote Link to comment Share on other sites More sharing options...
Treb Posted September 19, 2017 Share Posted September 19, 2017 (edited) Considering its age it might be necessary to check the electrolytic caps (cracked/bulging) in it. That said I see only two opamp types in its service manual: NJM4556 and NJM4558. If you replace these with sockets first you can experiment with pin-compatible opamps. Edited September 19, 2017 by Treb Quote Link to comment Share on other sites More sharing options...
BassBod Posted September 19, 2017 Share Posted September 19, 2017 Yes, before messing around with IC's I'd want to know the power supply was still operating within spec. Quote Link to comment Share on other sites More sharing options...
Ghost_Bass Posted September 20, 2017 Share Posted September 20, 2017 I had one, replaced it for a Alembic F1-X and honestly didn't found it was a huge upgrade. The PB1 sounds great and the Q control is very usefull in a hard room. Wish i had kept mine and saved some money. Quote Link to comment Share on other sites More sharing options...
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