preamp opamps

[sparky68]

hi
while im in the mood for updating the old Musical Fidelity stuff i have opened the preamp 8 and it has 4 opamps i think thats what they are ? ZVN4206E 's
what is a better opamp to upgrade this with if any

Thanks very much

Mark

 

[sparky68]

pic if it helps

An externally hosted image should be here but it was not working when we last tested it.

Mark

 

[PhaseLockLoopy]

If same pin config as NE5532 (Signetics) check out Raytheon's RC4227 -- boy is the noise floor far away

 

[sparky68]

cheers Phase
these are 14 pin type ? ive uploaded a pic but have to wait for a mod to publish as i haven't enough posts i believe ?

Mark

 

[moschfet]

Hi sparky,

the ZVN4206E is not a opamp. This is a mosfet-transistorarray.

Your preamp is more a diskret-circuit and you can not change the ZVN4206E for a opamp.

 

[sparky68]

ok thankyou moschet appreciate that
so not a lot i can do to improve the pre then ?
its not that its not good already to be honest just a thought thats all.
Regards
Mark

 

[PhaseLockLoopy]

That's a nice looking pre-amp, Sparks -- Just as an aside - I love doing pre-amps using all small signal transistor discretes, like Naim -Krell - Levinson etc -
it's ages since I used preamp packages

 

[Leon08]

It's really interesting how much this piece of **** costs.My DIY preamp is ways.. better then this garbage.

 

[sparky68]

out of interest Leon how much does it cost as it was given to me

 

[Xoc1]

If you feel like giving this a bit of a lift maybe you should try recapping the preamp with high quality capacitors such as Elna simics and/or Panasonic FC.
http://www.diyaudio.com/forums/parts/151392-best-electrolytic-capacitors.html
You could also look at the PSU circuit and regulators.

 

[sparky68]

cheers Xoc1 excuse my ignorance in these matters,
The way i have this set up is :
cdp or playonHD! streamer thingy TO Dac TO preamp TO monobloks
so what does the pre do ? does it just pass thru what the work that the dac does onto the amps or does the preamp alter the sound at all ? really sorry for the poor terminology
Mark

 

[Xoc1]

The preamp in your set up is just being used as a buffered volume control,
The preamp probably blocks any DC and RF and ensures that the power amp is driven properly at any volume setting, by driving the signal with a low impedance to minimise losses due to the interconnect cables to the monoblocks.

 

[sparky68]

ah ok thanks for that Xoc1 i appreciate your time
so.. its definatley worth changing the caps then.

Now do i start with the amps or pre-amp ?

All the best
Mark