yamaha EM-150 opamp

[drewl]

Hey all, tuning up a Yamaha EM-150 powered mixer for a coworker.

A couple of the BA311 opamps in the preamp are bad.
They seem pretty rare, single inline through hole.

Anyone know of a similar unit that might work?

I've tried retrofitting 741, OP27, 5534 with no luck so far.

[MarkusBass]

You'd need a special adapter but the easiest is to buy the IC from China: Shop BA311 online Gallery - Buy BA311 for unbeatable low prices on AliExpress.com

Mark

[The Dude]

Looks like Dalbani has them at their eBay store here:

BA311 Original New ROHM Integrated Circuit NTE1085 ECG1085 | eBay

or you can go to their site at dalbani.com and buy them directly.

[Enzo]

Oh wow, I had forgotten about Dalbani. They used to have a great selection of 16mm pots, even dual ones. They stopped having those, and I had little reason to shop there.

Much as I dislike NTE, it ought to be viable. Looking for it:

NTE Electronics Inc. - NTE1085 - IC, audio. Preamplifier, low noise.

NTE1085 - IC-Low-Noise AF Preamp - VETCO.NET

even Amazon
NTE1085 IC-LO-NOISE AF PREAMP: Communication Integrated Circuits: Amazon.com: Industrial & Scientific

[drewl]

Thanks, got all channels working but one which is fine for his use.
I can order those and pop them in sometime as he needs it this week.

I was hoping I could get one of the many standard opamps lying around to work without too much hassle but it would be easier to just get the correct ones.