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Potential 600ohm LCR group buy

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Gluca

Gluca

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Joined 2004
#1
Gauging interest for 600ohm (pultec clone) LCR RIAA modules. Lundahl has 45mH and 1.8 H chokes on catalog and they are selling for 130euro/pair and you need to add a couple capacitors and few resistors. We can also run a short PCB batch to make things prettier and easier to build. I believe a target price would be 300euro/pair but maybe we can work on that if volumes go up.

Gianluca
 
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#3
yes it is ... only 10k commercial available module I am aware of is by Silk and it is said to have a roll off at higher freqs. we should be sourcing bigger chokes for a 10k unit but I guess we would be facing the same roll off.
 
#7
Note, Dave Slagle Intactaudio/forum is the LCR-guru. He will tailor LCRs to suit anyones needs.

I have a pair of Lundahls and they have below acceptable tolerances. To be of use they need to be matched. They might have solved the problems now as it was a quite a few years since I bought them. I have a source who, anyway earlier, had matced units to sell.

The Tangos I had earlier had extremely tight tolerances.
 
#8
Jacmusic sells matched LL chokes (3% tolerance) and as far as I know a new model is now available. I know about the many discussions on Dave's forum and i am pretty sure his irons would be' bullett proof but not sure that would be a proper andlarge group buy. I need to recheck what's the story with that 7.5k RIAA he was developing
 
#9
Hello Gluca,
I guess Jacmusic has some connection with Diyparadiso in Belgium from where I have bought Lundahl. I think Lundahl made the LCRs for Diyparadiso at special order.

Do your really think 3% is good enough? Off course you can optimize with the caps and Rs but I would opt for 1%.
 
#10
I need to run some sims on spice to see how tollerance comes into the game. I never worked hands on a LCR RIAA (thou I've built 2 LC 18 and 24 dB 600ohm xover for my biamped system) but i guess you need to fine tune R and C to get closer to the ideal curve.
 
#12
If you happen to have the components value for that 7.5k RIAA i'll cranck the numbers into spice and see what a 3% tolerance means. I believe Slagle's inductors come with adjustment taps, very hand for accuracy of the whole filter.
 
#16
Guys

for 500$ we can buy the set of 4 chokes (80% nickel with taps for fine tuning) from Dave Slagle to build a 7380ohm RIAA. I will order from him. It is a bit more than LL but the higher impedance, the cores, the 2% taps are worth the extra money imho.

I asked if he could offer a special price for the group buy, i will keep you posted
 
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