Hi,
I have a Pioneer SA5300 vintage integrated Amplifier which I've been repairing. I've gotten everything working perfectly now except for the phono input which I've run into a problem. The guys over at another forum suggested that I take the problem here as you guys would possibly have more wisdom on this particular topic.
I need to replace a HA1452 opamp which is hard to find. A web search showed me that there is an equivalent NTE1480 - however that part doesn't prove to be any easier to track down.
So I'm wondering if anyone has any advice or knowledge of swapping this opamp out to a more modern chip. I've heard that u would be most likely using some type of adapter to mount the new opamp and possibly changing out some other components in the circuit around it,but I really don't know where to begin.
There is a schematic for the amplifier here -
https://www.hifiengine.com/manual_library/pioneer/sa-5300.shtml
And a data sheet / schematic for the HA1452 opamp here -
http://nice.kaze.com/av/HA1452.pdf
I have a Pioneer SA5300 vintage integrated Amplifier which I've been repairing. I've gotten everything working perfectly now except for the phono input which I've run into a problem. The guys over at another forum suggested that I take the problem here as you guys would possibly have more wisdom on this particular topic.
I need to replace a HA1452 opamp which is hard to find. A web search showed me that there is an equivalent NTE1480 - however that part doesn't prove to be any easier to track down.
So I'm wondering if anyone has any advice or knowledge of swapping this opamp out to a more modern chip. I've heard that u would be most likely using some type of adapter to mount the new opamp and possibly changing out some other components in the circuit around it,but I really don't know where to begin.
There is a schematic for the amplifier here -
https://www.hifiengine.com/manual_library/pioneer/sa-5300.shtml
And a data sheet / schematic for the HA1452 opamp here -
http://nice.kaze.com/av/HA1452.pdf
Is it faulty? Don't forget there are two separate amplifiers in the same chip and only one will be faulty so you can compare left to right. If it is, you can cobble together a TL072 for simplicity and functionality or a chip of your choice that will work on a single supply but it may take some doing if you are not experienced.
Can't access the schematic without logging in. That's not a common or garden op amp. It would probably be simplest to replace the whole phono preamp
The amp used is a clone of the LM709 from the 70's but a dual version on a single supply. Yes if faulty, use a different chip and wire it in.
Is it a standard dual op amp? My apologies for confusion
I can't find a drop in equivalent
I can't find a drop in equivalent
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Yes a standard old school type OP Amp and no equivalents were made since 1980.
Lots available on fleabay from known reputable suppliers as well. Bonus!
HA1452 | eBay
Lots available on fleabay from known reputable suppliers as well. Bonus!
HA1452 | eBay
I am also seeing some replacements available. I'm in Australia and have no way of knowing if any of these sellers are reputable or not. If you can point to a specific eBay listing that you would be comfortable purchasing from - that would be awesome!
If you do substitute I would strongly suggest you stick with old school OPAMPS. Like TLO72/82 NE5532/4 LF353 if BiFet.
You do not want to use some higher priced high speed or video OPAMP. Slapping these devices in audio circuits don't make for better performance. In fact they run a high risk of oscillation.
Even some of the newer "audiophile grade" OPAMPS can be troublesome in vintage circuits.
You do not want to use some higher priced high speed or video OPAMP. Slapping these devices in audio circuits don't make for better performance. In fact they run a high risk of oscillation.
Even some of the newer "audiophile grade" OPAMPS can be troublesome in vintage circuits.
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