rlaury
Well-known member
Hi All!
I came across some un-potted B&B modules. They have the same footprint
as the 990/2520. Just doing some preliminary testing, they measure
and sound as good as the 990 in a MCI 636 @ 55dB gain that has the Hardy retrofit installed.
At the bench they have no problem driving a 150 ohm load and distortion is very low at .01%
I replaced the LM356 with 5534A's as a sort of an upgrade, although
the LM356 works good too.
I know the benefits of building a discrete op amp, (noise) but has anybody
considered using a hybrid instead of a discrete? I would want to
add short circuit protection and a few other little goodies to the circuit
but the idea is there.
Schematic here: http://www.nashaudio.com/public/B&BOpAmp.pdf
Comment welcome!
I came across some un-potted B&B modules. They have the same footprint
as the 990/2520. Just doing some preliminary testing, they measure
and sound as good as the 990 in a MCI 636 @ 55dB gain that has the Hardy retrofit installed.
At the bench they have no problem driving a 150 ohm load and distortion is very low at .01%
I replaced the LM356 with 5534A's as a sort of an upgrade, although
the LM356 works good too.
I know the benefits of building a discrete op amp, (noise) but has anybody
considered using a hybrid instead of a discrete? I would want to
add short circuit protection and a few other little goodies to the circuit
but the idea is there.
Schematic here: http://www.nashaudio.com/public/B&BOpAmp.pdf
Comment welcome!
