Leak stereo 30 plus L1 coil type?

[stofbj]

Hi,
Can anyone confirm what type of coil to replace L1 with, the schematic is very blurry, but I think it's 10mH would that be right?



And would this one do as a replacement?


https://ie.farnell.com/kemet/su9h-01100/common-mode-filter-10000uh-thd/dp/2364354


Thanks in advance.

 

[Alan4411]

Yes 10mH is correct.

What is wrong with the original? If you have a good one to measure, check the DC resistance. Try and find one with a similar resistance for a replacement.

 

[stofbj]

One of the wires was broken, the inside one / start of the coil, I un-spun it and tried to wind it all back up, but after all that it still measured open circuit, think I got a few kinks in the copper wire, Even trying to sand and re solder the wire is difficult as it very thin. I will order the one I suggested so. They are a great little amp. I have one fully recapped running some very efficient vintage Philips speakers and sounds great. This one is the Wharfedale version, but exactly the same circuit. Thanks for your reply

 

[stofbj]

I will check the one on the other channel / card

 

[stofbj]

ok, I checked it in circuit and out of circuit and it's reading 47ohms, looking at the data sheets for the coil I posted a link too is only 8 ohms, would I be able to just put a resistor in series to bring it upto 47ohms? As long as the inductance of the coils match?

 

[stofbj]

Looking at it again, the coil I have is a single coil, not a double one, it has 4 pins soldered but the 2 small wires are only going to two of the pins, So I need a single coil with inductance of 10mH and DC resistance of 47ohms, or if possible a resistor in series. Anyone ever replace one of these on the leak amp?

 

[sgrossklass]

What do you think of this one? 10 mH, 42 ohms, sounds close enough.

 

[JonSnell Electronic]

I would fit a suitable replacement; Wire Wound Surface Mount Inductors I RS Components
A little bit of fitting and it will perform again, cutting the sibilance of the audio signal.
The Farnell coils are ideal.


Long lead time!
try here; B82145A1106J000 | EPCOS 10 mH +-5% Ferrite Leaded Inductor, Max SRF:350kHz, Q:50, 110mA Idc, 35Ω Rdc HLBC | RS Components

 

[Mark Tillotson]

Hi,
And would this one do as a replacement?

No, that's a line filter, prob. very non-linear as its not gapped. You want a signal inductor, with well behaved inductance, something like this https://uk.farnell.com/epcos/b82144a2106j000/inductor-10mh-5-50ma-350khz/dp/517926
Note the self-resonant frequency well above audio, and the 5% tolerance.

 

[stofbj]

Great thanks everyone for your help, I will order one tonight now that I know what I need.
Regards.