Hairball Audio

Re: [BUILD] FET/500 Official Support Thread
« Reply #360 on: June 07, 2018, 01:26:02 PM »
We can send you one if you like.

Email us.

Mike
Hairball Audio, LLC
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mcrowe

Re: [BUILD] FET/500 Official Support Thread
« Reply #361 on: June 09, 2018, 12:46:37 PM »
Hi Mike,

I will definitely do that. Before I do, I want to give a report about where I am with my build just to make sure there's nothing else I might need.

First, the good news: for the most part, the compressor seems to basically be working. I haven't calibrated it yet, but I sent a drum recording through as a test, and it sounds great. The overall level seems to be what it should be, it crunches up just a bit if I drive it, and all the controls do what they should.

Here's what's not working:

  • The 20:1 ratio does not work. In that position, no gain reduction is happening. All other ratios are working as expected.
  • The meter isn't working correctly. The slam LED always stays on, and the only LED that does seem to work correctly is the peak indicator. I've seen some other posts in this thread on this topic and I plan to reexamine my solder joints in these areas.
  • Neither the GR Off or Bypass LEDs illuminate, and the bypass function isn't working. The GR Off function, however, is working.

I plan on double-checking and reflowing solder joints, but if there's anything specific I should be looking about, I'd love to know. Also, I'd still like to know whether I should remove Q6 and install that spacer, or whether I'm OK with it installed as is.

Re: [BUILD] FET/500 Official Support Thread
« Reply #362 on: June 11, 2018, 07:15:11 AM »
We can send you a new matched set if you like. Send us an email.

Mike

hello Mike!!

Thanks for the Match pair of transistor!!!!

It solved my noise problem on the FET 500 REV A.

But I still got a problem. The gain reduction does not happen...

Everything's fine when calibrating until I have to put GR ON... nothing's happen on the meter board. The green LED (zero in the meter) stays....

I sent audio sample ont the unit and listened.... No compression...

If you have an Idea...

Thanks again Mike!!!!
Have a good day!!!!

Antoine

Hairball Audio

Re: [BUILD] FET/500 Official Support Thread
« Reply #363 on: June 11, 2018, 01:37:24 PM »
Hi Mike,

I will definitely do that. Before I do, I want to give a report about where I am with my build just to make sure there's nothing else I might need.

First, the good news: for the most part, the compressor seems to basically be working. I haven't calibrated it yet, but I sent a drum recording through as a test, and it sounds great. The overall level seems to be what it should be, it crunches up just a bit if I drive it, and all the controls do what they should.

Here's what's not working:

  • The 20:1 ratio does not work. In that position, no gain reduction is happening. All other ratios are working as expected.
  • The meter isn't working correctly. The slam LED always stays on, and the only LED that does seem to work correctly is the peak indicator. I've seen some other posts in this thread on this topic and I plan to reexamine my solder joints in these areas.
  • Neither the GR Off or Bypass LEDs illuminate, and the bypass function isn't working. The GR Off function, however, is working.

I plan on double-checking and reflowing solder joints, but if there's anything specific I should be looking about, I'd love to know. Also, I'd still like to know whether I should remove Q6 and install that spacer, or whether I'm OK with it installed as is.

You have to calibrate it.  I'm surprised it's working at all.

Make sure your LED's for bypass and GR off are in the correct polarity.

Mike
Hairball Audio, LLC
DIY Parts and Kits
http://hairballaudio.com/shop

Top secret stuff and upcoming releases:
http://facebook.com/hairballaudio
http://twitter.com/HairballAudio/

Hairball Audio

Re: [BUILD] FET/500 Official Support Thread
« Reply #364 on: June 11, 2018, 01:38:38 PM »
hello Mike!!

Thanks for the Match pair of transistor!!!!

It solved my noise problem on the FET 500 REV A.

But I still got a problem. The gain reduction does not happen...

Everything's fine when calibrating until I have to put GR ON... nothing's happen on the meter board. The green LED (zero in the meter) stays....

I sent audio sample ont the unit and listened.... No compression...

If you have an Idea...

Thanks again Mike!!!!
Have a good day!!!!

Antoine

Most likely an issue in your sidechain (back corner of the board), or if you have an A you don't have the R-OPT link in place.

Mike
Hairball Audio, LLC
DIY Parts and Kits
http://hairballaudio.com/shop

Top secret stuff and upcoming releases:
http://facebook.com/hairballaudio
http://twitter.com/HairballAudio/

Re: [BUILD] FET/500 Official Support Thread
« Reply #365 on: June 11, 2018, 03:46:27 PM »
Most likely an issue in your sidechain (back corner of the board), or if you have an A you don't have the R-OPT link in place.

Mike

Hello,

I've re-checked R-opt link so I'm sure about It.

What do you mean about the back corner of the board?!!!

Thanks a lot!!!!

Hairball Audio

Re: [BUILD] FET/500 Official Support Thread
« Reply #366 on: June 14, 2018, 12:05:31 PM »
Hello,

I've re-checked R-opt link so I'm sure about It.

What do you mean about the back corner of the board?!!!

Thanks a lot!!!!

The part of the board where you have the vertical resistors.
Hairball Audio, LLC
DIY Parts and Kits
http://hairballaudio.com/shop

Top secret stuff and upcoming releases:
http://facebook.com/hairballaudio
http://twitter.com/HairballAudio/

Re: [BUILD] FET/500 Official Support Thread
« Reply #367 on: June 15, 2018, 04:23:55 AM »
The part of the board where you have the vertical resistors.

Thanks!!!! I'll take a look!!!!

mcrowe

Re: [BUILD] FET/500 Official Support Thread
« Reply #368 on: June 17, 2018, 03:58:21 PM »
I'm still having trouble with the 20:1 setting and the metering on my rev A. I was able to calibrate the Q bias and the gain trim on the meter board. However, I couldn't get any of the green LEDs to come on. I wasn't able to perform the GR tracking calibration because the 20:1 ratio isn't doing any gain reduction. All other settings work, but not that one. I've reflowed the solder joints on the switch and the resistor network associated with it, but no luck. In 20:1 mode I do still get makeup gain. The other odd thing is that the slam LED stays lit all the time.

On a possibly related note, I made a mistake when initially populating the LEDs and ended up having to move some around. I couldn't get a reading on two of the yellow ones with my DMM's diode testing function after removing them from the board, so I'm guessing I fried them. At the moment those two aren't installed.

Any ideas where to focus my efforts?