Hello,
Here 4 pictures of my almost finished Aleph 4. Is it an 4 which has a bit higher bias and a change in the current source gain, to get a bit more punce in the bass department!
The inside is still a bit of a mess, because I ordered some professional made PCB boards which I will build with blackgates and holco's in the future. So I did not put much effort in cable guiding and stuff like this!
I sounds wunderfull and an absolute minimal of hiss and hum.
Thanks,
Edwin
Here 4 pictures of my almost finished Aleph 4. Is it an 4 which has a bit higher bias and a change in the current source gain, to get a bit more punce in the bass department!
The inside is still a bit of a mess, because I ordered some professional made PCB boards which I will build with blackgates and holco's in the future. So I did not put much effort in cable guiding and stuff like this!
I sounds wunderfull and an absolute minimal of hiss and hum.
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.
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.
Thanks,
Edwin
Now that's a seriously good looking amp. Silver and black always look better than one colour. Have some questions:
I see you used thermistors in series, what's the reason?
What about those fans on a side?
I finally see properly done output stage wiring. No PCB and p2p, that's the best way to do it.😉 Nice looking switch on front panel too. Where is it sourced from?
I see you used thermistors in series, what's the reason?
What about those fans on a side?
I finally see properly done output stage wiring. No PCB and p2p, that's the best way to do it.😉 Nice looking switch on front panel too. Where is it sourced from?
Nice looking amp!
Is that a current meter hanging on top of the heatsink? What reading do you have? Just curious.
Is that a current meter hanging on top of the heatsink? What reading do you have? Just curious.
It's more like a temperature meter. How those heat sinks behave, seem kind of small for Aleph 4 with incresed bias.😉
I am in the process of typing a piece of text for the diypass website! But here are some battle stats ;-)
2x 1000VA 40-0-40
16x 22000uf 63V
which gives about + / - 49.8V of loaded voltage, 52V unloaded!
P2P done with silver wire. The other pieces of wire are not very good but will be replaced with silver when kristian's PCB's are ready. I still have to find a good source for holco's where I can buy with creditcard.
I could not find 10 ohm thermistors, so 2x 5 ohm in serie.
The fans are there for safety. It is about > 33 degree celcius here at the moment :-(
I am very very happy with the switch. It is a vandal prove RVS switch with a micro-switch behind it. I use a bi-stable relais to switch it on and off with each click. I bought both at www.conrad.nl ! It looks like the same switch ( I think ) Nelson uses for his X150 amps! 🙂))
2x 1000VA 40-0-40
16x 22000uf 63V
which gives about + / - 49.8V of loaded voltage, 52V unloaded!
P2P done with silver wire. The other pieces of wire are not very good but will be replaced with silver when kristian's PCB's are ready. I still have to find a good source for holco's where I can buy with creditcard.
I could not find 10 ohm thermistors, so 2x 5 ohm in serie.
The fans are there for safety. It is about > 33 degree celcius here at the moment :-(
I am very very happy with the switch. It is a vandal prove RVS switch with a micro-switch behind it. I use a bi-stable relais to switch it on and off with each click. I bought both at www.conrad.nl ! It looks like the same switch ( I think ) Nelson uses for his X150 amps! 🙂))
Peter Daniel said:
it is a temperature meter! They are fischer SK435 blocks. Four of them! 200mm x 215mm x 80mm with a 18mm base plate!
So they are not that small 🙂
They behave good, but indeed a bit too hot. about 62C with a room temperature of 26C ..
Edwin
What kind of rectifying bridges are you using? I'm asking because I had some problems in the past when bridges blew because thermistors didn't provide enough inrush protection. I also tried puting them in series because of that. You seem to have a lot of capacitance to deal with thou.
how does it sounds compared to the luxman in the background?
Where did you get those trafo's and heat-sinks???
Verry nice, my complements!!!
As Peter mentioned, don't change output-stage wiring, it can't be nicer. (pcb is a way to have equal quality, not better...smd is even worse)
Got a ESS amp wired that way, even a Soundcraftsmen ma 5002a wire-wrapped, still working (both lightly modified)
Where did you get those trafo's and heat-sinks???
Verry nice, my complements!!!
As Peter mentioned, don't change output-stage wiring, it can't be nicer. (pcb is a way to have equal quality, not better...smd is even worse)
Got a ESS amp wired that way, even a Soundcraftsmen ma 5002a wire-wrapped, still working (both lightly modified)
lieven said:
The amp on the back is a Denon AVR3801. Only used for DVD movies which drives my back and center speakers. I use pre-out to my Aleph P for the front speakers.
My precious amp was a Classe CAP-151 integrated. The Aleph P + Aleph 4 wins ... ;-)
I bought the heatsinks from Texim, haaksbergen and the trafo's from Amplimo.
Edwin
Excellent job.
All compliments. Very impressive and I hope as well excellent sounding engine?
I have PCB's for Aleph 4 (mono block version) which I have ordered from PCB-Design (Kristijan) and they really look excellent.
Slowly completing my Aleph 4 but way far from finishing. May I ask you kindly if you can measure Voltages on 220uf capacitors, just curious as I have asked in an earlier post if I can use FK Series Black Gate capacitors 220uf/25V. 😉 Thank you in advance.
Congratulation one more time, looking forward to see DIYPass web site with additional Aleph 4.
Trigon.🙂
All compliments. Very impressive and I hope as well excellent sounding engine?
I have PCB's for Aleph 4 (mono block version) which I have ordered from PCB-Design (Kristijan) and they really look excellent.
Slowly completing my Aleph 4 but way far from finishing. May I ask you kindly if you can measure Voltages on 220uf capacitors, just curious as I have asked in an earlier post if I can use FK Series Black Gate capacitors 220uf/25V. 😉 Thank you in advance.
Congratulation one more time, looking forward to see DIYPass web site with additional Aleph 4.
Trigon.🙂
Peter Daniel said:
I used 2 times 25A 600V bridges. One for each channel, with all diodes of the bridges bypassed with a .47uf MKP. They are bolted to the floor of the amp.
Edwin
Great looking amplifier ! Could you tell us a little about the chassis construction, I really like the top plate that you used.
http://www.partsconnexion.com/catalog/resistors.html
Holco is the fourth tab over on the bottom.
Anthony
Now, with Holcos check if it's new or old production. New resistors are using magnetic materials and are reported not to sound as good as the old ones (which were not magnetic BTW).
Edwin,
You indicated that you have increase the bias. May I know what bias value do you have now? I have learn today on my own amp that 0.3A bias difference makes quite a bit of difference in the heatsink temp.
You indicated that you have increase the bias. May I know what bias value do you have now? I have learn today on my own amp that 0.3A bias difference makes quite a bit of difference in the heatsink temp.
Member
Joined 2002
You shold post a pic of your whole set up of your stereo from far back id like to see it..
Jason
Jason
Very very good looking.
I really like the looks of the case.
Did you get it ready made from somewhere ?
I really like the looks of the case.
Did you get it ready made from somewhere ?
- Status
- Not open for further replies.