Everything looks very good! Thank you for sharing the photos.
We are all eager to see more, and to hear news of your success!
🙂 🙂 🙂
We are all eager to see more, and to hear news of your success!
🙂 🙂 🙂
Looking real good. Wait till you hear it. I started with 3 pair Aleph J monoblocks. Single pair sound thin in comparison.
phew ... finished
both channels are dead silent
when i connect signal from preamp on one channel this starts to put out 1Vac if I reverse signal conectors the problem persists on the same channel, if I pull the conector out dead silent again.
I guess it`s a ground problem but from where ?
each aleph is conected to earth via 2x 1n4007 soldered contrary one to another
ok... I powered up only that channel and only him connected to preamplifier...problem persists and this time he blown away the 2A fuse too
both channels are dead silent
when i connect signal from preamp on one channel this starts to put out 1Vac if I reverse signal conectors the problem persists on the same channel, if I pull the conector out dead silent again.
I guess it`s a ground problem but from where ?
each aleph is conected to earth via 2x 1n4007 soldered contrary one to another
ok... I powered up only that channel and only him connected to preamplifier...problem persists and this time he blown away the 2A fuse too
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How do you have negative input wired? Double check grounding schema as you said.
is preamp oscillating.
is preamp oscillating.
negative input on both connected to ground.
the problem is that I proved to reverse signal wires too the last time when the fuse blown
the other channel sings with both signal wires arriving from preamp
the problem is that I proved to reverse signal wires too the last time when the fuse blown
the other channel sings with both signal wires arriving from preamp
Dunno whats causing oscillation. Its oscillating hard if it blew a fuse. Zm will be around. I am interested to see what he says on this one.
connected the amps directly to the laptop...same thing blows the fuse so I guess it`s a ground issue from this channel
Check basic connections with dmm. Check insulation if fets to sink. Traces should be no worry, so cant thank of where problem would be other than bad transistor some where.
Just don't know. If your input RCA connections are good, and you can feed same signal to other channel and all is fine, it's beyond me. Sorry.
dc offset on both channels starts from 0.6-0.8V and slowly goes down to 0.3 after half an hour.didn`t hold them connected more than that.I have C1 shorted, should I unshort him for a more reliable dc offset?
Reviving Aleph J project...
My Aleph J project stalled last spring as some problems arose, but now with the serious cold weather outside, my living room could use a little more heat! 😛
I'm starting my build audit with the power supply, in which a few MUR3020s failed. I'm a nube and this is my first Pass project - I have no previous experience with FREDs. I thought a simple picture would help, so looking at the attached representation of Peter Daniels' PS boards:
1) Please match each red number with the correct black number. 😀 [Antek AN-5224 transformers - dual mono]
2) Is it OK to tie the grounds where the green lines show?
...and two questions for later related to the IRFP 240s:
3) Is there any way to check if they are OK without desoldering and removing them?
4) Assuming I get all other issues sorted out, the final operating temperature of Q5 and Q6 is likely to be a few degrees higher than the temperature of Q7 and Q8 (due to airflow over the heatsinks, which will be adjustable). Is that a problem?
Many thanks in advance for any/all advice.
Frank
My Aleph J project stalled last spring as some problems arose, but now with the serious cold weather outside, my living room could use a little more heat! 😛
I'm starting my build audit with the power supply, in which a few MUR3020s failed. I'm a nube and this is my first Pass project - I have no previous experience with FREDs. I thought a simple picture would help, so looking at the attached representation of Peter Daniels' PS boards:
1) Please match each red number with the correct black number. 😀 [Antek AN-5224 transformers - dual mono]
2) Is it OK to tie the grounds where the green lines show?
...and two questions for later related to the IRFP 240s:
3) Is there any way to check if they are OK without desoldering and removing them?
4) Assuming I get all other issues sorted out, the final operating temperature of Q5 and Q6 is likely to be a few degrees higher than the temperature of Q7 and Q8 (due to airflow over the heatsinks, which will be adjustable). Is that a problem?
Many thanks in advance for any/all advice.
Frank
Attachments
managed to set the dc ofset on the channel that oscillates at 0mV, did this with input shorted and after an hour when it got warm.after that I did another test which consists into conecting only the ground of the amp to the ground of the preamp and in this case I see nothing on my dmm but when I connect ground and signal + it begins oscillating, curious that in this time it blew away the other channel fuse too
what could it be? input J`s ? goes beyond over my head...
have to mention that I did another test with the earth disconnected from the amp...still the same
what could it be? input J`s ? goes beyond over my head...
have to mention that I did another test with the earth disconnected from the amp...still the same
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