Hi everyone, has anyone here done the HA1452W opamp swap with another device? I have a JVC A3 amp that has a dodgy phono stage and since every part checks out, only the op-amp is left, both channels have a hashy background but the right channel is much worse. All voltages are perfect, as are the caps, I pulled several and checked capacitance, replacing a couple that had corrosion on their legs. The Line stage is spot on.
I have three possible 14 pin options here, though since I now will have guests any moment, I haven't been able to check their circuit details. They are: AD713AN; TL074CN and an LM324N.
Would really prefer a drop in replacement if possible, but it's no biggie to alter any compensation caps.
Be grateful if anyone can help out here.
I have three possible 14 pin options here, though since I now will have guests any moment, I haven't been able to check their circuit details. They are: AD713AN; TL074CN and an LM324N.
Would really prefer a drop in replacement if possible, but it's no biggie to alter any compensation caps.
Be grateful if anyone can help out here.
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The HA1452W is a non standard opamp. It can have 2 feed back paths per channel depending on implementation. The function of the circuit would need to be determined in order to fashion a replacement using standard devices.
They were made in the day when Hitachi Semiconductors were busy with ICs.
Here is the data sheet with PCB descriptions etc.
It is a phono pre amp so not difficult to use a TL072 etc.
Here is the data sheet with PCB descriptions etc.
It is a phono pre amp so not difficult to use a TL072 etc.
Thanks, duncan2, I had heard they are also hard to find, but I shall track one down, voltages look the same and everything, I do like a drop in! I'm not so keen on buying a Chinese HA1452W.
DrDetail if you want send your ship info by pm.
i can send you a pair of HA1452W (not Chinese) for free.
i can send you a pair of HA1452W (not Chinese) for free.