Aleph J builders thread
dissappeared from the Front Page of this forum (which had me worried), and as I had a question anyway, here goes (forgive me, I'm new to transistors): Does a spreadsheet (or reasonable facimile) exist (in one complete file) for the small parts needed to build an Aleph J, F5, F5T, and any other version of Aleph ? What I mean is, eventually I will end up building at least 4 different DIY Pass amplifiers, It would be nice to know in advance how many of a particular value of capacitor, resistor, diode, transistor, etc. are required to build, say, four different amplifiers. As I usually buy a minimum of ten pieces of everything anyways, it would be really helpful to know in advance what I will be needing "quantity wise" of a particular value in small parts . thanks, Paul
dissappeared from the Front Page of this forum (which had me worried), and as I had a question anyway, here goes (forgive me, I'm new to transistors): Does a spreadsheet (or reasonable facimile) exist (in one complete file) for the small parts needed to build an Aleph J, F5, F5T, and any other version of Aleph ? What I mean is, eventually I will end up building at least 4 different DIY Pass amplifiers, It would be nice to know in advance how many of a particular value of capacitor, resistor, diode, transistor, etc. are required to build, say, four different amplifiers. As I usually buy a minimum of ten pieces of everything anyways, it would be really helpful to know in advance what I will be needing "quantity wise" of a particular value in small parts . thanks, Paul
KevinTams -
Sorry I didn't see this earlier.
Input from single ended is -- RCA center to +IN, RCA outer to GND, jumper -IN to GND.
Thats the best photo I have, it's a little small, sorry. But you can see the fine blue wire from -IN to GND, the white fom RCA outer to GND, and Blue, RCA center, to +IN
Where is C1? omitting that is going to cause problems. Are your Jfets still good?
Sorry I didn't see this earlier.
Input from single ended is -- RCA center to +IN, RCA outer to GND, jumper -IN to GND.
Thats the best photo I have, it's a little small, sorry. But you can see the fine blue wire from -IN to GND, the white fom RCA outer to GND, and Blue, RCA center, to +IN
Where is C1? omitting that is going to cause problems. Are your Jfets still good?
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KevinTams -
Sorry I didn't see this earlier.
Input from single ended is -- RCA center to +IN, RCA outer to GND, jumper -IN to GND.
Thats the best photo I have, it's a little small, sorry. But you can see the fine blue wire from -IN to GND, the white fom RCA outer to GND, and Blue, RCA center, to +IN
Where is C1? omitting that is going to cause problems. Are your Jfets still good?
Hi, so I finished the first of two Aleph J amp
And the sound good, as good as I had hoped.
But there is a little hum from speakers, when only the amp is on, is normal or what?
When I turn it off, it gives the bass unit a large puf but doesn't say anything. What can be wrong?
I have installed soft start board
I am missing the front
Krath
And the sound good, as good as I had hoped.But there is a little hum from speakers, when only the amp is on, is normal or what?
When I turn it off, it gives the bass unit a large puf but doesn't say anything. What can be wrong?
I have installed soft start board
I am missing the front
Krath
Attachments
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I worked hard to keep my input and output wiring as far away from AC cables and the transformer as possible. I still have a power on noise, despite a soft start board too. I get a tolerable power off noise. No hum from my amp, with sensitive speakers.
I also have an intermittent switch on the front that controls a solid state relay for on/off, and am unsure if that is causing my noise. I need to take a look at changing the capacitor to further retard the power on process. Either that or scrap the soft start and just try the slow start with the CL-60s. The oversized 400VA tranny, and similarly oversized cap bank are somewhat at fault.
I also have an intermittent switch on the front that controls a solid state relay for on/off, and am unsure if that is causing my noise. I need to take a look at changing the capacitor to further retard the power on process. Either that or scrap the soft start and just try the slow start with the CL-60s. The oversized 400VA tranny, and similarly oversized cap bank are somewhat at fault.
I am just about finished with my Aleph J. Thanks to all the input that I got here and particularly to 6L6 for his guidance and interest. There were a few speed bumps but they were my own doing.
I tried to use the spades and faston connectors where I could. I am in pretty good shape if I want to swap out the amp boards.
I am not getting any hum, so far, but do get an audible "bump" on turn off.
I did a quick audio audition and I am very satisfied. I used a couple of PSB Alpha B1s (Alphas for the Aleph?) in the quick set up and the Aleph J seemed to beg for better speakers. Any input on that would be appreciated for both stock and DIY suggestions.
I'm still in the adjustment stage and have to button everything up, but I did put a few pictures on my Gallery page. This was a great project with a great product at the end of it.
I tried to use the spades and faston connectors where I could. I am in pretty good shape if I want to swap out the amp boards.
I am not getting any hum, so far, but do get an audible "bump" on turn off.
I did a quick audio audition and I am very satisfied. I used a couple of PSB Alpha B1s (Alphas for the Aleph?) in the quick set up and the Aleph J seemed to beg for better speakers. Any input on that would be appreciated for both stock and DIY suggestions.
I'm still in the adjustment stage and have to button everything up, but I did put a few pictures on my Gallery page. This was a great project with a great product at the end of it.
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Greg's Aleph J - My Photo Gallery
If that does not work, just click on my name, go to my profile and to the right there is a link to Greg's Gallery.
If that does not work, just click on my name, go to my profile and to the right there is a link to Greg's Gallery.
Hi krath, very nice. Good idea to use two transformers and two PSU boards. Your can try these steps:
1) reduce the area between the wires connected to the RCA connector.
2) Reduce the area between the wires connecting to the diodes.
3) Perhaps the wires that connect the PSU to the PCB are too long.
4) Pin 1 of the XLR is conneced to the wrong place ( see: http://www.diyaudio.com/forums/diya...udio-component-grounding-interconnection.html )
1) reduce the area between the wires connected to the RCA connector.
2) Reduce the area between the wires connecting to the diodes.
3) Perhaps the wires that connect the PSU to the PCB are too long.
4) Pin 1 of the XLR is conneced to the wrong place ( see: http://www.diyaudio.com/forums/diya...udio-component-grounding-interconnection.html )
