I'd say that the problem is it was one of a number of devices intended
for "low noise dual preamplifier" applications, and there wasn't really
second sourcing. It's not as if it's an standard pin-out op-amp with
some specs spruced up for a specific application. There were various
devices at the time that were about the same thing (one might argue
that they all claimed to be the best device for the purpose), but they
all had differences in pin-outs or specs.
So the NTE was a good solution, since it would be a direct replacement.
Beyond that, unless you can find a source of the LM387, it will require
some reworking of the circuit.
Michael
I do not mind if the pin out is not the same (DIL or SIL) but it must
be low noise and bandwidth for 10 MHz or better, below is the spec.
The circuit it is in has a supply voltage of 26 volts.
The main problem is the large output swing.
• Low noise: 1.0 µV total input noise
• High gain: 104 dB open loop
• Single supply operation
• Wide supply range LM387: 9 to 30V LM387A: 9 to 40V
• Power supply rejection: 110 dB
• Large output voltage swing (VCC - 2V)p-p
• Wide bandwidth 15 MHz unity gain
• Power bandwidth 75 kHz, 20 Vp-p
• Internally compensated
• Short circuit protected
Thanks
