Musical Fidelity Pre Amp II

FraserSoft · 19th August 2012, 07:23 PM

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.?

FraserSoft · 20th August 2012, 01:07 PM

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 ?

dirkwright · 20th August 2012, 01:17 PM

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.

FraserSoft · 20th August 2012, 02:17 PM

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.

dirkwright · 20th August 2012, 02:19 PM

Quote:

Originally Posted by FraserSoft

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.

FraserSoft · 20th August 2012, 02:25 PM

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.

19th August 2012, 07:23 PM	#1
FraserSoft diyAudio Member Join Date: Jul 2012 Location: Tynemouth, North East England	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.?

20th August 2012, 02:17 PM	#4
FraserSoft diyAudio Member Join Date: Jul 2012 Location: Tynemouth, North East England	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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20th August 2012, 01:07 PM	#2
FraserSoft diyAudio Member Join Date: Jul 2012 Location: Tynemouth, North East England	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 ?

20th August 2012, 01:17 PM	#3
dirkwright diyAudio Member Join Date: May 2011 Location: Virginia	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.

20th August 2012, 02:25 PM	#6
FraserSoft diyAudio Member Join Date: Jul 2012 Location: Tynemouth, North East England	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.