APOX volume-input for Aleph P1.7 question

[Leeuwarden]

Well, still having bad luck with he APOX stuff. Ik think the volume board developed a problem (again). It creates a loud humm even when the amp is off. It also turns on my Hypex power-amps one way or another whhile it is only connected through an interlink.

At this point I'm seriously considering to do something bad to the guy who sold me the APOX stuff and said it was working as it should.

 

[Leeuwarden]

Took everything apart. The Aleph is still functioning.

Tried the APOX volume and input as a passive attenuator: still hummm

Anyone want to buy my APOX? Maybe you can repair it...

 

[AudioSan]

mine is comming together.
soon ready for startup

 

[Leeuwarden]

What is the board below the control board?

 

[AudioSan]

that is the front panel. all knobs will be wired.

 

[Leeuwarden]

The APOX has left the building...

 

[Leeuwarden]

Ordered a Dantimax set...

 

[Leeuwarden]

Audiosan, how is your Aleph doing?

 

[Leeuwarden]

Today the Dantimax boards arrived. Looks great. So let's see if I can finish this project without having the need for serious medication

 

[AudioSan]

hello. my pass is now done. and it sounds very good i have a little bit of noise in one channel. it is the volum control, but its a easy fix. i hope

 

[AudioSan]

Today the Dantimax boards arrived. Looks great. So let's see if I can finish this project without having the need for serious medication

witch resistor set for the volume control did you order?
or is it potmeter your using?

 

[AudioSan]

BTW. here it is the front and back panel is not finnished yet.

 

[AudioSan]

and a few more

 

[AudioSan]

and my hypex power amp

 

[Leeuwarden]

I have a 1K resistor-set with Dale resistors.

 

[AudioSan]

dont use it. you need a 10K resistor set and place the control on the output.
i tryed 1K in the input. but the level was very low up to -7db

 

[Leeuwarden]

I checked with Mikkel and his answer was it should work. He also told me not to forget the load resistors.

I'm going to give it a go. The worst that could happen is I have to de-solder some resistors and put in some new ones.

 

[Mfly]

With the Aleph, you need 1K sets with volume control on the output. This way the output impedance stays relatively 'low'. When you put the volume control on the input (as is done with many other preamps), you want a close match to the input impedance of your preamp.

 

[Leeuwarden]

Thanks Mfly!

 

[AudioSan]

dont use it. you need a 10K resistor set and place the control on the output.
i tryed 1K in the input. but the level was very low up to -7db

ehm. this was wrong. 10k on the input. i tryed 1k on the output.