balanced RIAA preamp

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#6
ok I have a list of solutions for that I posted somewhere, but here is a starter. Note there will be many more on this forum that I may have missed, especially the INA based ones of which there are many



1. Twisted pair retro Retro - Balanced RIAA Stage PCBs available and supported on this forum
2. Cordell vinyltrak Linear Audio | your tech audio resource you have to pay €2.99 for the article, but well worth it. No PCBs so vero board or make your own
3. Scott Wurcer's take on the vinyltrak idea simplifying it as much as possible whilst keeping superb performance. A simplified universal differential or single ended phono preamp . I believe Patrick (EUVL) was doing an updated version of this which I will build one day.



Any of those take your fancy.
 
#7
#8
That first link from you is the one that I have built (but not run yet) as I wanted a baseline Flat preamp with switchable RIAA and the ability to remote the front end was of interest to keep capacitance down. It however would horrify a lot of sensitive types with the number of 8 legs in it 🙂
 
#9
There's also The Wire Balanced RIAA preamp. SMD soldering required, though the designer thinks it's doable with an iron and steady hand.

There's a Douglas Self design from the Signal Transfer Company. I have the impression it's single ended input, balanced output though I'm happy to be wrong on this. Does both MM/MC, separate inputs for each.

I've been looking for something balanced for a while and had almost settled on building the Twisted Pear design, though I'm interested to see what else pops up on this thread...
 
#10
One thing to bear in mind with MM is that one side of one coil is connected to the can. In theory you should run a 5th wire for ground to get best benefits. In practice it may not make much difference as the coils are good antenna so there is DM signal you can't get rid of balanced or not.
 
#12
billshurv said:
One thing to bear in mind with MM is that one side of one coil is connected to the can. In theory you should run a 5th wire for ground to get best benefits. In practice it may not make much difference as the coils are good antenna so there is DM signal you can't get rid of balanced or not.
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You are right, but in my mind, some catridges have coils externaly grounded, so you can cut wire and get a real balanced link
But I think that more complexity is only usefull with harsh environment (broadcast...).
 
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