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Old 19th August 2012, 07:23 PM   #1
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Default Musical Fidelity Pre Amp II

I have finished tri amping my 3 Doctor Thomas's with seperate powers supplies and now want to have a fiddle with my pre amp. I have noticed since getting the circuit it has LF353 op amps has anyone got suggestions for a better replacement.?
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Old 20th August 2012, 01:07 PM   #2
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I am surprised amongst all you Fanatics that nobody can come up with a better alternative to the LF353 op amp, surely someone has some thoughts ?
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Old 20th August 2012, 01:17 PM   #3
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You need a dual jfet input opamp with the same pinout. Is there a particular problem you're addressing by wanting to replace them? If you really want to replace them, then I'd go to the National.com website and look around.
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Old 20th August 2012, 02:17 PM   #4
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Default LF353

Nothing in particular appears wrong with my pre amp but since getting back into messing around with my Hi Fi and tweaking things including a Marantz CD-94 I though the pre amp might benefit from a tweak. The ic I have found is an Analogue Devices AD 823 which seems to be a drop in replacement for the LF353 and they are not to expensive.
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Old 20th August 2012, 02:19 PM   #5
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Quote:
Originally Posted by FraserSoft View Post
Nothing in particular appears wrong with my pre amp but since getting back into messing around with my Hi Fi and tweaking things including a Marantz CD-94 I though the pre amp might benefit from a tweak. The ic I have found is an Analogue Devices AD 823 which seems to be a drop in replacement for the LF353 and they are not to expensive.
It's lower noise and lower distortion so if it fits then that's a good choice.
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Old 20th August 2012, 02:25 PM   #6
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Thanks for the comment, I have an off board MM phono stage using Linear Technology ic's so the only function of the pre amp is the volume control and the Class A output stage it has. I find the output stage useful as it drives the 3 Musical Fidelity Doctor Thomas's I have without any strain.
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