1

MU524 Vari-Mu Tube Compressor / 48 DC volts reading

« on: January 03, 2024, 10:31:41 PM »

Hi I'm building 4 of those and two of them are giving me 33vdc instead of 45-48vdc, what could be the problem? I was able to calibrate it no problem only when it come to adjusting the VU to 6db I can't do it properly.

2

Discussions about the products / SK25 vs SK99

« on: February 06, 2021, 07:35:06 PM »

What is the difference sonically between the SK25 and SK99, does the SK25 sound more like the API 2520 and the SK99 more like a Jensen JE990?

3

SK25/SK99 Discrete Op-Amp / getting hot or not

« on: January 12, 2021, 08:35:00 PM »

Hi wondering if the SK25 is suppose to get hot, I mean real hot, I build 4 and 3 of them get pretty damn hot, the 4th one not at all. I'm talking about the Q9 BD139 NPN power transistor.

Also just to add here, I'm using a test jig, so to not burn anything on the module, the one that is cool, seem to give little more output judging by the reading of the oscilloscope. the other three are similar to each other.

4

CP4500 Stereo Bus Compressor / burned led

« on: January 03, 2021, 09:49:02 PM »

Hi just build the CP4500, ready to test, so far so good, plugin the my extender like i normally do with all my build, once i power it up i notice that the led on the meter goes on right away, no big deal perhaps, i start testing all the points like normal procedure, all report correct, then i push the in button, green led flashes an guess what burn out right away, i tested and notice that i get -16v on the negative led of the led, the led of the meter are not burned but they are always on tho! any idea where is my problem?