I am now prepare to make my Aleph2
I want to Spent more on the parts (resistors, Caps.....Diode....)
Which Brand(s) and Model is best on Aleph2?
thanks
I want to Spent more on the parts (resistors, Caps.....Diode....)
Which Brand(s) and Model is best on Aleph2?
thanks
Silver mica in the feedback loop (the 10pf one), black gate electrolytics (next best are elna cerafines), caddock, vishay or some other exotic(?) resistors, silver wires...
Nelson's prefered resistors are Dale (Vishay brand) I think he uses these in his product line. One of the suppliers for these is Parts Express, and are less expensive than the ones mentioned by skaara which are more exotic and maybe better. But for a power amp??? it's a matter of preference though since some members of this forum use them even on XO for speakers.
On my Aleph 4 I used a mixture of regular metal films and Dale MF for the 221 Ohms which is widly used on Aleph's as gate resistors
On my Aleph 4 I used a mixture of regular metal films and Dale MF for the 221 Ohms which is widly used on Aleph's as gate resistors
I would use any reliable and durable part available around.
The different parts might create different sounds within top few percentages at best.
JH
The different parts might create different sounds within top few percentages at best.
JH
i used dales, black gates, silver micas, silver solder, and still deciding on hookup wire. if you look around, you can do it cheap. i think i spent around $150 for the project thus far. all i need is the transformer and case. (2 monos)
I don't think that high end caps will make much of a difference in the Alephs. Using a good electrolytic like the Panasonic is fine. For C-5 a higher grade cap might make subtle differences if you are planning on using a balanced line stage preamp.
I used a combination of parts in mine.....almost all surplus too.
Dale RN65 metal film resistors, Standard NTE electrolytics, film caps for C6, and C7, and for C8 I used a very high end cap that looks like a resistor, perhaps its ceramic. Heatsinks and chassis metal that I used was all new...Heatsinks from M&M Metals, Alumnium stock from Metal Supermarkets, PCB's by Brian GT, Toroids, filter caps and bridges were also from the same surplus place. So far the most expensive item were the heatsinks at 280.00, next was buying 100 IRFP240's, and 24 IRF9610's. I've probably spent 600.00 so far on this and there is still anodizing to do when all is said and done. I suspect at least 200.00 to get that done. I figured it might cost about 1K to do it right when I started on this.
BTW: My sinks only run at 55 degrees C (69 deg f ambient) after being on for several hours, so the huge sinks were well worth getting. When I took readings the other day the bias was a tad low so I cranked that up and raised the heatsinks off the table so air could circulate up through them as in actual operation. That lowered temp by about 5 to 7 degrees c. I think this is a bit cooler than most other Alephs are running here.
See this thread for pics of the sinks and other parts I used.
http://www.diyaudio.com/forums/showthread.php?threadid=8703
Mark
I used a combination of parts in mine.....almost all surplus too.
Dale RN65 metal film resistors, Standard NTE electrolytics, film caps for C6, and C7, and for C8 I used a very high end cap that looks like a resistor, perhaps its ceramic. Heatsinks and chassis metal that I used was all new...Heatsinks from M&M Metals, Alumnium stock from Metal Supermarkets, PCB's by Brian GT, Toroids, filter caps and bridges were also from the same surplus place. So far the most expensive item were the heatsinks at 280.00, next was buying 100 IRFP240's, and 24 IRF9610's. I've probably spent 600.00 so far on this and there is still anodizing to do when all is said and done. I suspect at least 200.00 to get that done. I figured it might cost about 1K to do it right when I started on this.
BTW: My sinks only run at 55 degrees C (69 deg f ambient) after being on for several hours, so the huge sinks were well worth getting. When I took readings the other day the bias was a tad low so I cranked that up and raised the heatsinks off the table so air could circulate up through them as in actual operation. That lowered temp by about 5 to 7 degrees c. I think this is a bit cooler than most other Alephs are running here.
See this thread for pics of the sinks and other parts I used.
http://www.diyaudio.com/forums/showthread.php?threadid=8703
Mark
Anthony77 said:
If you are using Black Gates, bi-polar is better. I don't know about other brands. I used Panasonic HFQ electrolytics.
I'm using a 51 uF Solen at the output of my BoZ linestage. No
complaints.
I couldn't read the value in the picture. Just how big are those
that you are thinking of using?
Erik
complaints.
I couldn't read the value in the picture. Just how big are those
that you are thinking of using?
Erik
What voltage rating do the 220uF caps C5, C9 and C10 need to be? I have some 25v Black Gates I'd like to use for my A2's.
The electrolytics in the Aleph circuit itself can be
low voltage (say 5V) except for the bootstrap
filter on the current source, which sees 1/2 the
supply voltage.
low voltage (say 5V) except for the bootstrap
filter on the current source, which sees 1/2 the
supply voltage.
What wattage do the resistors need to be. I think I messed up by buying 1/8W. No big deal. I only spent $8.00 on all 1% metal film. I thik I'll use them in the input signal path but change to 1/2W for the current source for the diff pair and control for output current source.
DC Blocking Cap
In the Aleph 2, would replacing the DC blocking/ feedback electrolytic cap 220uF C5 with a say 40uf polycarbonate cap from Rifa significantly affect the bass response? I found the size and price of these caps to be quite reasonable. Solen does produce 220uF polyprops but their size is out of this world!
ckt
In the Aleph 2, would replacing the DC blocking/ feedback electrolytic cap 220uF C5 with a say 40uf polycarbonate cap from Rifa significantly affect the bass response? I found the size and price of these caps to be quite reasonable. Solen does produce 220uF polyprops but their size is out of this world!
ckt
apassgear said:
Sorry about the confusion, the correct supplier of my Dale resistors is Allied Electronics
alliedelec.com
Cost around $8 per box of 100 Pcs.
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