Here are some pictures of my Aleph P. I just have to have the knobs Brass Plated. This my first "finished project". I have a Zen IV and an Aleph 3 that is sitting in my family room making music but still needing some metal work to be called finished. Tell me what you think. By the way, it sounds heavenly. Thanks Nelson.
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An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
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Oohhh...it's nice!!!
You seem to be well equipped too.
Cleaned the house for the pictures?
I can only see one mistake: make it serial number 0 😉
/Hugo
You seem to be well equipped too.
Cleaned the house for the pictures?
I can only see one mistake: make it serial number 0 😉
/Hugo
Very well done. You get an A+ 🙂
(makes me want to do a better job on my BZLS!)
be sure to submit to PassDIY!
(makes me want to do a better job on my BZLS!)
be sure to submit to PassDIY!
Great work!
I see you used 4 pole atenuator for volume control. How many positions has got-12 or 24 ?
I see you used 4 pole atenuator for volume control. How many positions has got-12 or 24 ?
The volume control is a DACT 24 position attenuator and the gain controls are ELMA 24 position switches set as 2K ohm pots using Holco resistors.
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Volume control questions
Hi kilowattski,
did you use the dact on the in- or output?
Is it possible to use a stereo pot on the output?
Which value of the dact did you use?
Very nice preamp!🙂
Hope to build one too in the next months.
illusionxx
Hi kilowattski,
did you use the dact on the in- or output?
Is it possible to use a stereo pot on the output?
Which value of the dact did you use?
Very nice preamp!🙂
Hope to build one too in the next months.
illusionxx
Howdy,
I used a DACT 10K stereo balanced attenuator (4 sections ganged) on the output. I made my own gain controls for each channel using an ELMA 24 position switch set up as a 2K series attenuator using Holco H8 resistors. It is possible to use pots on the output. You would need four 5K pots ganged together for balanced operation. If you want single ended outputs you only need two pots ganged, but you will have half your normal output. Your max output will be 10v instead of 20v (balanced mode).
I used a DACT 10K stereo balanced attenuator (4 sections ganged) on the output. I made my own gain controls for each channel using an ELMA 24 position switch set up as a 2K series attenuator using Holco H8 resistors. It is possible to use pots on the output. You would need four 5K pots ganged together for balanced operation. If you want single ended outputs you only need two pots ganged, but you will have half your normal output. Your max output will be 10v instead of 20v (balanced mode).
Taco,
In the trading post a guy has some nice rotary switches for sale.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=44089
You could make some nice attenuators with them instead of the pots.
In the trading post a guy has some nice rotary switches for sale.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=44089
You could make some nice attenuators with them instead of the pots.
Thanks for your replay, kilowattski.
Where did i have mi mind! Of course i want balanced output. So i will have to buy an expensive 4 deck rotary switch.
Maybe one from Walter Burkhard.
Regards
illusionxx
Where did i have mi mind! Of course i want balanced output. So i will have to buy an expensive 4 deck rotary switch.
Maybe one from Walter Burkhard.
Regards
illusionxx
illusionxx,
you can use a two deck rotary switch as a balanced output attenuator, much cheaper, only one resistor in the signal path, no need for expensive resistors and perfectly balanced!
William
you can use a two deck rotary switch as a balanced output attenuator, much cheaper, only one resistor in the signal path, no need for expensive resistors and perfectly balanced!
William
wuffwaff
Doesn`t this only work for one channel? What do you mean by ' no expensive resitors needed'? I thought a rotary switch doesn`t contain resistors.
Doesn`t this only work for one channel? What do you mean by ' no expensive resitors needed'? I thought a rotary switch doesn`t contain resistors.
Hi,
a rotary (24-position) switch needs one or two resistors per step to provide a series or ladder pot (see the DACT homepage).
A balanced output pot switches one resistor between plus and minus out per step (see Borbely homepage).
This means one stereo stepped attenuator (with the right resistors) can be used for two channel balanced out.
William
a rotary (24-position) switch needs one or two resistors per step to provide a series or ladder pot (see the DACT homepage).
A balanced output pot switches one resistor between plus and minus out per step (see Borbely homepage).
This means one stereo stepped attenuator (with the right resistors) can be used for two channel balanced out.
William
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