Hello Victor,
I have some questions about the Lundahl SUT kit.
First, what is the purpose of what looks like a socket and shorting jumpers. The label to the right seems to imply that it might provide a way of switching from transformer secondaries grounded to transformer secondaries not grounded:
Next question -- is there a schematic available for the completed circuit? Not being able to see the traces of the PCB it's not possible to figure out what is and isn't grounded. I prefer a SUT circuit like this:
Rather than this:
(Attribution for the two schematic drawings to Alexey Korf from his excellent blog at https://korfaudio.com/blog99 )
Thanks!
Steve Z
I have some questions about the Lundahl SUT kit.
First, what is the purpose of what looks like a socket and shorting jumpers. The label to the right seems to imply that it might provide a way of switching from transformer secondaries grounded to transformer secondaries not grounded:
Next question -- is there a schematic available for the completed circuit? Not being able to see the traces of the PCB it's not possible to figure out what is and isn't grounded. I prefer a SUT circuit like this:
Rather than this:
(Attribution for the two schematic drawings to Alexey Korf from his excellent blog at https://korfaudio.com/blog99 )
Thanks!
Steve Z
Attachments
Great! Thanks so much Victor.
Nice design -- the user has a choice of tying primary side to ground, secondary side to ground, both or neither.
Steve Z
Nice design -- the user has a choice of tying primary side to ground, secondary side to ground, both or neither.
Steve Z
LL1931Cu
Furutech FP-900 2 pairs
1877 24K Gold Plated Terminal 1 pcs
Total $565
Hammond 1590xx $20
Furutech FP-900 2 pairs
1877 24K Gold Plated Terminal 1 pcs
Total $565
Hammond 1590xx $20
Lundahl LL1931AG Kit $1895
Assembled version $2100
Assembled version $2100
- LL1931AG X2 + PCB + switch
- WBT RCA Sockets 0244 2X Red + 2X White
- 4 x HEX M3-7 screw
- 1 FT copper-vcap 24 AWG 1ft
- Pure wool damping material
- CMC metal enclosure with 4 footers
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All of this to listen to Hotel California? Anyway, the price is peanuts compared to AN SUTs Nice touch with the wool damping. Hashimoto does that too . I bet they listen to hotel California to test their gear too. I mean , it's probably overkill reference point for American customer anyway .
there is no doubt at all.
LL1931Ag with cmc box better than a lot expensive SUT in the market..
.
LL1931Ag with cmc box better than a lot expensive SUT in the market..
.
Hi Victor,
My low-output moving-iron Grado Aeon3 is kind of an in-between case -- at 1.0 mv output (and internal resistance of 74 ohms) the output is too high for high or medium ratio SUTs such as the LL1931 or LL1933 and the reflected load from a 47K MM phono input is way too low for Grado's recommended 10K to 47K load.
Do you have the Lundahl LL1961 or LL1963 available for your SUT enclosure and parts kit? Series connected either one should give me a more usable voltage into my MM stage and while still a lower than optimum load for the Grado, hopefully will be acceptable in terms of tonal balance.
1:18 and 1:24 SUTs really roll off the high frequencies of the Grado relative to mids and bass.
Thanks!
Steve Z
My low-output moving-iron Grado Aeon3 is kind of an in-between case -- at 1.0 mv output (and internal resistance of 74 ohms) the output is too high for high or medium ratio SUTs such as the LL1931 or LL1933 and the reflected load from a 47K MM phono input is way too low for Grado's recommended 10K to 47K load.
Do you have the Lundahl LL1961 or LL1963 available for your SUT enclosure and parts kit? Series connected either one should give me a more usable voltage into my MM stage and while still a lower than optimum load for the Grado, hopefully will be acceptable in terms of tonal balance.
1:18 and 1:24 SUTs really roll off the high frequencies of the Grado relative to mids and bass.
Thanks!
Steve Z
Thank you, Victor. Do you sell your very nice SUT enclosure and parts without the transformers? I can probably find the LL1961 or 1963 on my own (though not at your outstanding prices!).
Steve Z
Steve Z
In Herb's May 2025 Gramophone
He uses EQ1616D and Lundahl LL1931Ag to help him to review Lyra Delos Cartidge.
To be honest with you... LL1931AG is my LOVE
He uses EQ1616D and Lundahl LL1931Ag to help him to review Lyra Delos Cartidge.
To be honest with you... LL1931AG is my LOVE