I am currently idle-testing my amp with no load and no signal attached.
Power supply comes from a 2x22 Vac transformer (500 VA), primary capacitors (20 mF per rail), then a R-C for each channel (and rail) (165 mOhm - 30 mF).
Both rails are at about 30V dc, which is quite high for a Aleph 30 but since my heatsinks are big enough I don't care.
After a hour the thermistor I use for inrush protection settled at about 72 °C, while the heatsinks are slightly different but at least 20 degrees below.
I noticed that the "signal" mosfets get quite hot: is a small heatsink mandatory or they can be avoided?
for now.. that's all folks!
Cheers
Andrea
Power supply comes from a 2x22 Vac transformer (500 VA), primary capacitors (20 mF per rail), then a R-C for each channel (and rail) (165 mOhm - 30 mF).
Both rails are at about 30V dc, which is quite high for a Aleph 30 but since my heatsinks are big enough I don't care.
After a hour the thermistor I use for inrush protection settled at about 72 °C, while the heatsinks are slightly different but at least 20 degrees below.
I noticed that the "signal" mosfets get quite hot: is a small heatsink mandatory or they can be avoided?
for now.. that's all folks!
Cheers
Andrea
Andypairo said:
If you run normal bias (5V acoss R11) on them, they can be avoided. (I don't use them).
😎
They were made by a friend of mine with a CNC machine.. next step is the replacement of the front panel with a better wood, probably cherry.
Output connectors are already changed to golden ones...
Cheers
Andrea
Output connectors are already changed to golden ones...
Cheers
Andrea
First "serious" listening tests
Last evening I came to a friend's house bringing a heavy present, my (at last) completely re-wired Aleph to perform a listening test.
Speakers were B&W DM604, Preamplifier Yamaha MX-1000 (with on-board dac), CD player was actually a DVD player (digitally connected to the preamp).
Room quite large and with only few furniture pieces, so quite reflective.
The other amp was the companion of the MX-1000 , quite unfair as a comparison because of the great power difference. (This one puts > 500W as I was told).
After a evening made testing all three (the fourth was there only to drink!!) agreed that the sound was very good, especially in the mid-high range, lacking perhaps some control in the bass region.
The low impedance of the speakers didn't help at all, however the results were satisfying to adequate SPL levels, especially with non-synthetized music, voices and instruments seemed very natural.
Only some problems at higher volumes with CDs like "The Division Bell" but the great presence of bass frequencies (and the power required to play them) probably exceeded the available power of the amp.
In conclusion... I'm pleased, but I'd like to test it in another environment, with higher-impedance speakers and a smaller room.
To be continued...
Andrea
Last evening I came to a friend's house bringing a heavy present, my (at last) completely re-wired Aleph to perform a listening test.
Speakers were B&W DM604, Preamplifier Yamaha MX-1000 (with on-board dac), CD player was actually a DVD player (digitally connected to the preamp).
Room quite large and with only few furniture pieces, so quite reflective.
The other amp was the companion of the MX-1000 , quite unfair as a comparison because of the great power difference. (This one puts > 500W as I was told).
After a evening made testing all three (the fourth was there only to drink!!) agreed that the sound was very good, especially in the mid-high range, lacking perhaps some control in the bass region.
The low impedance of the speakers didn't help at all, however the results were satisfying to adequate SPL levels, especially with non-synthetized music, voices and instruments seemed very natural.
Only some problems at higher volumes with CDs like "The Division Bell" but the great presence of bass frequencies (and the power required to play them) probably exceeded the available power of the amp.
In conclusion... I'm pleased, but I'd like to test it in another environment, with higher-impedance speakers and a smaller room.
To be continued...
Andrea
anynews?
what efcienty speakers was?
I am doubting abouttwo amps to buiklt- zenv4 and aleph 30.
but I have all information about zen(pcb mades,layout) but almost no for aleph. have you any inf about god rezoliution pcb, and layout?
thanks
what efcienty speakers was?
I am doubting abouttwo amps to buiklt- zenv4 and aleph 30.
but I have all information about zen(pcb mades,layout) but almost no for aleph. have you any inf about god rezoliution pcb, and layout?
thanks
The DM604 have 90 dB efficiency.
About the Aleph series you can find the service manuals on www.passdiy.com, and also various PCBs searching on the forum.
Cheers
Andrea
About the Aleph series you can find the service manuals on www.passdiy.com, and also various PCBs searching on the forum.
Cheers
Andrea
Attachments
![dm604s2-30l[1].jpg](/community/data/attachments/15/15998-2fe82414eba48f2b956ef1a4514341d3.jpg?hash=L-gkFOukjy)
Andypairo,
To increase the bass performance of the Aleph try a balanced source like the BSOZ . It will not disappoint you!
Cheers 🙂
To increase the bass performance of the Aleph try a balanced source like the BSOZ . It will not disappoint you!
Cheers 🙂
Since I don't have any balanced equipment I didn't even provide my Aleph with balanced connection.. 
but I have discovered that a friend owns a balanced tube preamp (and wants to sell it!), so I'll afford the expense of 2 XLR connectors shortly..😉
BTW if you look ath the thread where BLS PCB group purchase is discussed you can notice I had your same idea.
I'd like to build myself the preamp also, but I'd also like the remote control and the features that a commercial preamp offers.
In your opinion is a good idea to use the BLS after a regular preamp only as unbal-to-bal converter?
Cheers
Andrea
but I have discovered that a friend owns a balanced tube preamp (and wants to sell it!), so I'll afford the expense of 2 XLR connectors shortly..😉 BTW if you look ath the thread where BLS PCB group purchase is discussed you can notice I had your same idea.
I'd like to build myself the preamp also, but I'd also like the remote control and the features that a commercial preamp offers.
In your opinion is a good idea to use the BLS after a regular preamp only as unbal-to-bal converter?
Cheers
Andrea
Andypairo said:
It may be a good idea but you will need a pot at the output of the BLS to trow away some gain (and avoid noise) .
I would use it as a preamplifier/converter and find a remote-controlled-motorized pot for its inputs.
😎
stefanobilliani said:
Yes, but where WAF rules you also have to make things good-looking, and if for a power amp it is not a great problem for a preamp is a pain! Unless you can suggest me a suitable case to fit my BLS into....
Cheers
Andrea
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