Oddball chip

[Mark Hammer]

I picked up a couple of old Dukane  PA mixers today, primarily because the price was right ($20 each) and they're sturdy 1U rack chassis already machined for 10 pots.  So, prime real estate for something else when I have time.

The mic preamps have input transformers.  The mixer uses 741s ( ).  But the interesting part is that the two mic preamps use an NE5533.  That's right.  NOT a 5534 or 5532 but a 5533.  It's  an externally-compensated 14-pin dual op-mp.  I was hoping it  might have the same pinout as a 4739, to accommodate all those Craig Anderton classics, but the pinout is simply incompatible with anything else I've ever seen.

Op-amp A -  pins 1, 2, and 12.  Op-amp B - pins 6, 7,and 10.

Weird, huh?  If you're aware of anything else with the same pinout, you're my hero.

[davent]

Just checked and I have one of those 5533's, must have purchased in the 80's, as well found a couple 4136's in the same drawer.

dave

[R.G.]

Dead bug mounting. Put in what you like.

[anotherjim]

LM747. Which is a dual 741 - so extra pins are offset not comp'. Still active but not in DIP.
OP04 same pinout - also internal comp'.

[armillary]

R.G. I never stop learning new things from you. Thanks! I didn't know dead bug was an official term, but quickly found this:
https://workmanship.nasa.gov/lib/insp/2%20books/links/sections/303_deadbugs.html

[Mark Hammer]

The only caveat I would add is that dead-bugging 14-pin chips is contra-indicated for use with 1590A enclosures!    (I feel like I should have a long list of potential side-effects, like they do in those pharmaceutical commercials)

[armillary]

There once was a case with no clearance
a dead bug's legs caused interference
the engineer tread
to squash it instead
admiring the change in appearance.

[Mark Hammer]

Many likes. 

[PRR]

The Electronic Packaging Handbook
edited by Glenn R. Blackwell
CRC Press, Nov 29, 1999
ISBN   1420049844, 9781420049848

Analog Devices, MT-100 TUTORIAL:
Breadboarding and Prototyping Techniques
http://www.analog.com/media/en/training-seminars/tutorials/MT-100.pdf
page 3