676

MP512 Microphone preamplifier / Re: connector missing

« on: December 06, 2021, 08:57:33 AM »

You can skip the DI completely as long as you insert the jumper on JMP1.
Please send us an email here so that we can send you the missing part.

677

LA502 Optical Compressor / Re: Not working as expected during setup

« on: December 03, 2021, 04:27:30 PM »

When adding a lot of gain reduction, the transients from "pop-sounds" actually becomes a lot louder than in the original waveform
This is because the optical compressor is slow. The fast transients can't be caught by the compressor.

When setting the unit up with my audio interface - Apogee Duet 2 - I very easily get sort of a "ringing sinus tone that becomes very loud when turning up the gain.
Probably some feedback through the audio interface/DAW combination. 

678

LA502 Optical Compressor / Re: Not working as expected during setup

« on: December 02, 2021, 09:03:15 AM »

Remove U5 and U6 and check if the behavior is the same (this will deactivate the side chain).
Next, remove U2, U3, U4, one at a time and check.

679

LA502 Optical Compressor / Re: Not working as expected during setup

« on: November 30, 2021, 08:40:28 AM »

The circuit self oscillates. Check the value (marking 470) and solder joints of capacitor C4.
Same thing for R6 and R7.

680

LA502 Optical Compressor / Re: Not working as expected during setup

« on: November 29, 2021, 06:31:44 PM »

the VAC jumps from 1,5VAC/1kHz to 7,5VAC/2,5kHz
What gives you the frequency display? Is it the DMM? Is it reliable?
Did you try listening to the output signal? Do you hear a frequency change? or a saturation?

681

CP4500 Stereo Bus Compressor / Re: CP4500 Setup trouble

« on: November 29, 2021, 06:05:48 PM »

because there have to be IC's in channel 1, right?
Yes right.

Insert the doubtful IC's, one by one on the working board and check rapidly the +/-15V and if the board is working.
If one of the power rail goes down, turn off rapidly.

682

SK25/SK99 Discrete Op-Amp / Re: R10 Burnt on

« on: November 29, 2021, 05:57:15 PM »

Great!

683

First Aid / Re: 501 connector polarity with xt500 and jumper pins settings??

« on: November 29, 2021, 05:56:12 PM »

Yes, correct.

684

CP4500 Stereo Bus Compressor / Re: CP4500 Setup trouble

« on: November 26, 2021, 04:32:41 PM »

Please report the DC voltages on the 8 pins of U10.

685

CP4500 Stereo Bus Compressor / Re: CP4500 Setup trouble

« on: November 26, 2021, 11:37:06 AM »

What is the DC voltage on TP5, with no input signal and threshold at +15?
Check the resistors value and solder joints of R36, R37.
Is TP4 going to 0 if you remove U9?
If yes try putting the other 2180C in U9 and check if it changes.
If not try putting another OPA2134 in U10 and check if it changes.

686

MP566 Tube microphone preamplifier / Re: Shut down tube while not in use

« on: November 26, 2021, 08:36:11 AM »

A connection that would discharge C25 (like a 1k resistor across the pins) would shut down both the heater and the high voltage.

687

CP4500 Stereo Bus Compressor / Re: CP4500 Setup trouble

« on: November 26, 2021, 08:30:00 AM »

What is your PCB revision number?
Can you report the DC voltages (against 0V) on the 8 pins of U9?

688

CP4500 Stereo Bus Compressor / Re: VU Meter Jumps to 5 when there is power to my lunchbox, weird board measurements

« on: November 22, 2021, 09:58:12 AM »

Check the resistor (in circuit) with an ohmmeter : 1 ohm.
It looks destroyed. It means there is a short circuit somewhere on the board that caused the destruction.
Check the short with the ohmmeter, between V+ and 0V.
Unplug from the front PCB and check again.
Remove all the IC's and check again.

689

CP4500 Stereo Bus Compressor / Re: VU Meter Jumps to 5 when there is power to my lunchbox, weird board measurements

« on: November 20, 2021, 05:53:15 PM »

• V+ =+15 to +16VDC, 0.73 VDC

This is the first issue to take care of.
Remove all the IC's and check again.
The + rail comes through R41. Check if it is present on both sides.

690

CP5176 FET compressor / Re: wobbly pots

« on: November 17, 2021, 05:51:19 PM »

I don't think there is a reliability issue there because the shaft is loosely coupled to the pot wiper.
You could try (carefully) some heat shrink tube on the shaft?

691

SK25/SK99 Discrete Op-Amp / Re: R10 Burnt on

« on: November 17, 2021, 05:43:37 PM »

Not sure.
One failure often cause other components destruction.
You must first find out the reason of the issue.

692

MC624 Monitor Controller / Re: 1% resistors

« on: November 15, 2021, 11:09:18 AM »

A 1% deviation between channels is a 0.09dB difference which is below the noticeable level.

693

SK25/SK99 Discrete Op-Amp / Re: R10 Burnt on

« on: November 15, 2021, 10:21:13 AM »

Swapped Q9 -Q10 ?

694

CP4500 Stereo Bus Compressor / Re: DMM says 0.3 VAC instead of 3.0 VAC

« on: November 11, 2021, 03:48:50 PM »

The specs of the Rubix22 say 8dBu maximum output. This is 1.95VAC at 0dBFS.
So it is not surprising that you could not reach the 3V.

695

501 Single Host / Re: Noisey unit

« on: November 10, 2021, 08:11:42 AM »

Can you try to power the 501 with a different 12V adapter?
If there is no change, you could send us the 501 & MP573 for a check.

696

CP4500 Stereo Bus Compressor / Re: Test Voltages incorrect

« on: November 09, 2021, 09:28:24 AM »

It looks like your meter black probe is not properly connected to the 0V.
Check the solder joint on the 0V test pin.
Check that the finger connector at the back of the unit is clean of any solder flux.

697

LA502 Optical Compressor / Re: La 502 0 VAC ON OUTPUT

« on: November 08, 2021, 09:08:07 AM »

This means that the tranformer are fine?

Yes.

The relay, how about the last pins, need or not ti be solder?

No, the last 2 pins are not connected.

If you do get the AC voltage across R17, then the only possibility is a defective relay.
Send me an email here to get a replacement part.

698

TS500 Tape Simulator / Re: Everything works but high frequencies are getting lost somewhere

« on: November 04, 2021, 06:31:54 PM »

Check component value, direction and solder joints on:
R33, R34, C35 to C38, U10, U6.
Try removing U6 and listen if it makes a change.

699

LA502 Optical Compressor / Re: La 502 0 VAC ON OUTPUT

« on: November 04, 2021, 06:23:57 PM »

Do you hear the bypass relay clicking when going from BYP. to IN?
With power off:
Measure the transformer secondary resistance (about 23 Ohms) on the output, between hot and cold.
Measure the transformer primary resistance (about 5 Ohms) between TP1 and 0V.
Check the solder joints on the relay.

700

EQ573 Equaliser / Re: WARNING : Error on C8 in EQ573-II

« on: October 25, 2021, 05:22:45 PM »

Please send me an email here with your current address for replacement parts.