To summarize it from the manual:
WLM is An inductive VOLTAGE AMPLIFICATION (SUTs) + A solid state CURRENT AMPLIFICATION stage (MOS-FET)
There is a separate MM phono stage inside and i’m happy about the quality of it with 100k Vishay load resistors.
My upgrade now is all about separate MC part of Phonata, so i think i will replace SUTs and i will also replace stock 47k Ohm resistors in MC path with better qulity 47k Vishay.
I wish i could just measure step-up ratio of the stock SUTs to replace them with similar, but better quality SUTs from Lundahl catalog.
Actually recommended by Lundahl SUT (as safe alternative) is very small LL9226:
http://www.lundahl.se/wp-content/uploads/datasheets/9226.pdf
Turns ratio and possible use at different termination alternatives for this SUT:
A
Turns ratio: 1:5
Copper Resistance: 20Ω / 260Ω
Suggested use for best frequency response: MC cartridge < 100Ω
C
Turns ratio: 1:10,
Copper Resistance: 5Ω / 260Ω
Suggested use for best frequency response: MC cartridge < 50Ω
E
Turns ratio: 1:20,
Copper Resistance: 1Ω / 260Ω
Suggested use for best frequency response: MC cartridge < 25Ω
------------------------------------------------
Actually most of my MC cartridges have a fairly low impedance such as 2Ω, 3Ω , 5Ω, 8Ω ... only one of my MC has 20Ω impedance.
So maybe i need another SUT from their catalog with step-up ratio ?
WLM is An inductive VOLTAGE AMPLIFICATION (SUTs) + A solid state CURRENT AMPLIFICATION stage (MOS-FET)
There is a separate MM phono stage inside and i’m happy about the quality of it with 100k Vishay load resistors.
My upgrade now is all about separate MC part of Phonata, so i think i will replace SUTs and i will also replace stock 47k Ohm resistors in MC path with better qulity 47k Vishay.
I wish i could just measure step-up ratio of the stock SUTs to replace them with similar, but better quality SUTs from Lundahl catalog.
Actually recommended by Lundahl SUT (as safe alternative) is very small LL9226:
http://www.lundahl.se/wp-content/uploads/datasheets/9226.pdf
Turns ratio and possible use at different termination alternatives for this SUT:
A
Turns ratio: 1:5
Copper Resistance: 20Ω / 260Ω
Suggested use for best frequency response: MC cartridge < 100Ω
C
Turns ratio: 1:10,
Copper Resistance: 5Ω / 260Ω
Suggested use for best frequency response: MC cartridge < 50Ω
E
Turns ratio: 1:20,
Copper Resistance: 1Ω / 260Ω
Suggested use for best frequency response: MC cartridge < 25Ω
------------------------------------------------
Actually most of my MC cartridges have a fairly low impedance such as 2Ω, 3Ω , 5Ω, 8Ω ... only one of my MC has 20Ω impedance.
So maybe i need another SUT from their catalog with step-up ratio ?

