(a) Page 21 - Bad TL081 op-amp (U1) on Amplifier Board causes "hiss" or "popcorn" noise
(b) Service Bulletin # TFM-45-6: To verify that 4558 IC's (U2) are either
whereby other brands 4558's can cause turn-off thumps and squeals
It is my surprise to see that the U2 op-amps' in my TFM-45 are of Japan Radio Corporation JRC4558D, non of above-mentioned. My question is why TFM-45 was factory-installed JRC4558D, instead of either one of above-mentioned. As both the Exar's and Raytheon's I believe is no longer available in Malaysia, is the RC4558P of Texas Instrument (Made in Malaysia ) identical in performance as compared to Raytheon RC4558?
I searched and found interesting information about the comparison between JRC4558D and RC4558P:
My second question is that will Texas' have less hiss or popcorn noise than JRC? In fact I have bought RC4558Ps' but still hesitate to give them a try. Is anyone here has experience on this regard?
I intend to change the U1 as well.