21

LA502 Optical Compressor / Re: Hissing LA502

« Last post by UrbanOsterman on July 05, 2025, 03:24:55 PM »

I moved the LA502 to either a Bento6 or a Bento8. Works OK.
Cannot use the LA502 in a Bento10, too noisy???

Urban Osterman

22

LA502 Optical Compressor / LA502 Losing lower Freq

« Last post by UrbanOsterman on July 05, 2025, 03:20:41 PM »

 
Hello
When I insert my LA502 into my Microphone-preamp-chain, I loose a bit of Bottom from my Sound.
Is there a way not to loose the lower frequency in the LA502? or is it part of the design?
Is this normal or did I make some error in my soldering?

My Chain is Mic/SM58 into AB528 into LA502.
Maybe it is some sort of Impedance issue?
I hear that I loose some bottoms on my voice.
I try to insert som pink noise instead of talking into the mickrophone.
But its hard to se in the spectrum analyser.

Regards
Urban Osterman

23

LA502 Optical Compressor / Re: C5 or not c5

« Last post by UrbanOsterman on July 05, 2025, 01:25:42 PM »

Hello
When I insert my LA502 into my Microphone-preamp-chain, I loose a bit of Bottom from my Sound.
Is there a way not to loose the lower frequency in the LA502? or is it part of the design?
Is this normal or did I make some error in my soldering?

Regards
Urban Osterman

24

EQ531T Tube Equalizer / Re: EQ531T build

« Last post by Lud on July 05, 2025, 10:12:05 AM »

After playing with it frequencies seems right but the HPF does not work correctely, it attenuates pretty much all the frequencies, it act like kind of a fader or attenuator?

25

EQ531T Tube Equalizer / Re: EQ531T build

« Last post by Lud on July 05, 2025, 09:36:37 AM »

Unit is working now.

 I've tested another module in the lunch box i use for testing and there was the same noises so i replace a full working module in my wokflow chain and no noises at all. Everything seems fine. I have to know now whats wrong with the lunch box i usualy work with for building modules.

26

MU524 Vari-Mu Tube Compressor / Re: Light Hiss/Noise

« Last post by egelmett on July 04, 2025, 04:02:25 PM »

If the issue is caused by a defective component, no charge, you only pay for the shipping.
In the other cases, our rate is 59 € per hour (+VAT if applicable).

I have already replaced many of the electrolytic capacitors...would you prefer I reinstall the components that came with the kit when sending to you, i.e. back to factory components?

27

EQ531T Tube Equalizer / Re: EQ531T build

« Last post by Lud on July 03, 2025, 05:28:50 PM »

I have 36 ohms.

28

EQ531T Tube Equalizer / Re: EQ531T build

« Last post by JPK on July 03, 2025, 05:22:20 PM »

Check the output transformer connections: You should read around 35ohms between the output XLR pins 2 & 3, Power on, EQ on, no input signal.

29

EQ531T Tube Equalizer / Re: EQ531T build

« Last post by Lud on July 03, 2025, 10:45:39 AM »

Ok, so this is what i got :

TP1 : 0,75
TP2 : 0,7
TP3 : 0,7
TP4 : 0,65
TP5 : 0,65
TP6 : 0,65

Those cracklings are actually always there, even when the Lunch box is off.

I've removed the face, the IC's and there is still that noises crackling. I remade some solder joints, I checked the caps polarities. It seems to me that it cames from a ground issue and/or a cap but i can't see from where. I also wonder if Q2 is well placed?

30

EQ531T Tube Equalizer / Re: EQ531T build

« Last post by JPK on July 02, 2025, 05:17:32 PM »

I added a Try to follow the signal section in this thread: https://www.soundskulptor.com/forum/index.php?topic=7346.0
Try it!