LJM l20se and l20.5 potentiometers

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Korppi

Member
Joined 2018
#1
Hello,


What would be right value for potentiometers controlling the input level/volume for Ljm l20se and l20.5 amplifiers?


I have active setup and i would need to set the right input level only once. That way i can get levels right for each channel Bass, mid and treble.


Wouldnt want to get the ljm preamps since all my toroids are single supply and over the voltage.


I have many 10K ohm alps, dont know if they will work well
 
#2
Korppi said:
Hello,


What would be right value for potentiometers controlling the input level/volume for Ljm l20se and l20.5 amplifiers?


I have active setup and i would need to set the right input level only once. That way i can get levels right for each channel Bass, mid and treble.


Wouldnt want to get the ljm preamps since all my toroids are single supply and over the voltage.


I have many 10K ohm alps, dont know if they will work well
Click to expand...

It can be used without a pre amplifier.
The 10K potentiometer is very good. Just use it directly.
I rarely use the preamplifier.
Pay attention to the power supply and heat dissipation. These two are very important.

In addition, you need to pay attention to the real goods. And fake goods.
In case of fakes. Please email me ljm_ljm@foxmail.com[/email]
 

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#5
Hello all !!!

According your experience, and this configuration, for 4ohm speaker what do you recommend?

Power supply - 2 x 200w 18-0-18 v + 2 x 40.000uf 50v

With ljm l20se or mx50se with 50k or 20k potentiometer bouth without preamplifier.

Thanks
 
#8
Can someone please suggest correct value of capacitor in marked areas?
Boards I have received show "106" ie 10uf while pictures from other sellers show it to be "105" ie 1uf.

So should it be 1uf or 10uf ?

Thanks in advance.
 

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#9
drmaftoon said:
Can someone please suggest correct value of capacitor in marked areas?
Boards I have received show "106" ie 10uf while pictures from other sellers show it to be "105" ie 1uf.

So should it be 1uf or 10uf ?

Thanks in advance.
Click to expand...

From the early days, I used 105.1uf
Later I thought 106 might be better. So I changed it to 106.
Later in use, I found out. There's no difference. ok
In order to avoid doubt from customers. Because the word printed on PCB is 106. Then I have to mail 10 UF BP capacitor to customers. In fact, there is no difference in use.
If you have any questions, please email me
ljm_ ljm@foxmail.com
 
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