Lundahl LL1931AG STEPUP Transformer

[vkung]

 

[zettelsm]

The chassis is cut from a solid aluminum block in order to get rid of the inteference from the T/T air pump.

Now is dead quiet... Absoluterly no hum...​

Late to this thread but that is a VERY nice enclosure, Victor. Do you have those for sale or was it a one-off for your own personal system?

I've thought about using a step-up transformer off and on for years but I've always been put off by the high prices for ready-built SUTs and I've also tried to minimize the number of plug/jack junctions on the unamplified side of phono circuits.

I know amorphous cores are currently the hot choice in magnetic devices but I think I'd be interested in the mu-metal Lundahl LL1933Ag rather than the LL1931Ag. Do you have those in stock, Victor?

Thanks!

Steve Z

 

[vkung]

This is my first sample. I should have the final version next week. Yes I order 40 PCS in this summer.
I only have LL1931Ag or Copper with Amorphous Core in stock..

 

[zettelsm]

Thank you, Victor. Have you had a chance to compare the LL1931 to the LL1933, either Ag or Cu?

Steve Z

 

[vkung]

Yes.. you can hear the huge difference.. the silver is more than double the copper SUT

 

[zettelsm]

I'm sorry, I wasn't clear -- I meant have you had a chance to compare the mu-metal core to the amorphous core SUTs? I'd expect there to be a very noticeable difference between silver and copper, especially for the price of the silver versions!

Thanks,

Steve Z

 

[vkung]

NO.. 1931 Copper or silver in Amorphous. core only..

 

[vkung]

The CMC enclosure is available now for LL1931Ag or LL1931 Copper.​

 

[assosman]

Hi, Victor. What is the price of the enclosure?

​

 

[vkung]

I do not know yet.. I should know on next week. Do you need the WBT RCA socket?
The enclosure is quite heavy... at least 1KG..

 

[assosman]

Hi,Victor. I would only need the enclosure as I bought the kit with the Hammond enclosure of you last year, and was just going to swap them over.
Thanks, Scott.

 

[vkung]

ok... I should have the shipment on Wednesday

 

[vkung]

Shippment received today
If you are intereested, please email me.

 

[vkung]

Here is the pricing for LL1931Ag (silver and LL1931Cu (copper)

Lundahl LL1931AG Kit $1850

• LL1931AG X2 + PCB + switch
• WBT RCA Sockets 0244 2X Red + 2X White
• 4 x HEX M3-7 screw
• 1 FT UniCrystal Silver/Cotton 24 AWG 1ft
• Pure wool damping material
• CMC metal enclosure with 4 footers

 

[vkung]

The top one is the production version


This one installed with LL1931 Copper with 21 AWG 6N copper hookup wire from VCAP + WBT 0244


Damping Material Pure WOOL .....

 

[vkung]

 

[noob2019]

For those of us with the board, transformers, etc from a purchase when it was housed in a wood box.

What is the price of the new enclosure (CMC metal enclosure with 4 footers) alone?

Thanks

 

[vkung]

You cannot use the RCA socket from the wood box except the ground terminal. please see below...
Email your request to info@vkmusic.ca

 

[vkung]

Zavfino 24K Gold Plated (Copper Ground Port)


You can insert the exact loading resistor as per your cartidge's spectiication
LL1931/LL1933 set for a step-up of 18dB (with no Rload the load impedance is 727 ohms)
LL1931/LL1933 set for a step-up of 24dB (with no Rload the load impedance is 180 ohms)

For 100 ohm Loading impedance , the loading resistor is 8.06K (18dB) or 60.4K (24dB)


WBT 0244 RCA socket

 

[vkung]

I am extremely happy about this project...Now I can use either tone arm and cartidge as simple as 123..
It is dead quiet and airy...