when speaking of amp's phase , it is strictly related to in-out phase relationship , of amplifier in question
so , normally taking in account one channel only , observed as black box
when two speakers in space are out of phase , that's just anomaly ...... of phase characteristic of entire system
so , normally taking in account one channel only , observed as black box
when two speakers in space are out of phase , that's just anomaly ...... of phase characteristic of entire system
Yes it confused me at first also. At first glance, I thought the two pics shown were the same amp, one of one channel, one of the other...but closer look its two different amps.
Russellc
Same here. With the DAC and its inversion switch, on bass heavy or intense vocal passages, it seemed sometimes one sounded better, but I could NEVER be able to guess with any statistical significance in a blind test!
Russellc
Can the 2SJ74 be substituted by the LSJ74B (the matched JFETS currently in the diyaudio store)? This seems to be the case for the F6. Thanks.
Yes, the LSJ74 is a very suitable jfet for the Aleph J. It works and sounds wonderful .
And soon there will be J74/J74 matched pairs in the diyAudio Store for this very project.
And soon there will be J74/J74 matched pairs in the diyAudio Store for this very project.
Last edited:
The package will contain (4) LSJ74B, arranged into (2) matched pairs.
Perfect for a stereo Aleph J.
Perfect for a stereo Aleph J.
Pass DIY Addict
Joined 2000
Paid Member
Very nice build! I see that your input JFET pair have been strapped together, but I can also see an air gap between them in your image. One small suggestion might be to open your plastic tie, add a drop of thermal paste between your transistors and make sure they sit tightly together and then add new plastic tie.
Thanks for your help but, following ZenMod advice, I unsoldered the JFet so that is not gap anymore.😎
Yes, see the lower 240V wiring diagram that you posted. Whether it's two 120V windings in series
or just one 240V winding makes no difference.
Last edited:
finally after 2years (i got the pcb when it was still pre-order), my alephj is working. this is just 1 side monoblock completed, another one will be done next week.
* CRC supply, C is kendeil 68mF 50V, R panasonic 0.47R 3W. ripple measured 400mV, while my dmm is not true rms (R will be replaced by inductor later)
* 400mV on source resistor, dc offset is steady <1mV after 1hour.
* no thump during power on/off. i think that CL60 is working great here.
* deadly silence, no hiss no hum.
* 47°C on bottom heatsink at nearest irfp, 45°C on irfp plastic body, measured with laser temp meter. room temp is 28°C.
6L6 build guide is helping me so much, which make me trouble free untill now
* CRC supply, C is kendeil 68mF 50V, R panasonic 0.47R 3W. ripple measured 400mV, while my dmm is not true rms (R will be replaced by inductor later)
* 400mV on source resistor, dc offset is steady <1mV after 1hour.
* no thump during power on/off. i think that CL60 is working great here.
* deadly silence, no hiss no hum.
* 47°C on bottom heatsink at nearest irfp, 45°C on irfp plastic body, measured with laser temp meter. room temp is 28°C.
6L6 build guide is helping me so much, which make me trouble free untill now
Attachments
Last edited:
Fantastic!! Wonderful!!
Congratulations on a successful construction, looking forward to seeing the other channel complete.
Thank you for sharing the photos. 🙂
Congratulations on a successful construction, looking forward to seeing the other channel complete.
Thank you for sharing the photos. 🙂
measured my hand wound inductor at my friends, it only get 2.9mH where on calculation it should get around 4mH. Maybe because i did not wound it well. So i try to put a hammer inside the hole and inductance getting higher now.
As i read for inductor saturation, if i use this inductor on my CLC supply, which one is better? 2.9mH air core or 4mH ferrit core? if ferrit core saturates, what will inductance value, 2.9mH or become zero.H?
As i read for inductor saturation, if i use this inductor on my CLC supply, which one is better? 2.9mH air core or 4mH ferrit core? if ferrit core saturates, what will inductance value, 2.9mH or become zero.H?
Attachments
finally after 2years (i got the pcb when it was still pre-order), my alephj is working. this is just 1 side monoblock completed, another one will be done next week.
* CRC supply, C is kendeil 68mF 50V, R panasonic 0.47R 3W. ripple measured 400mV, while my dmm is not true rms (R will be replaced by inductor later)
* 400mV on source resistor, dc offset is steady <1mV after 1hour.
* no thump during power on/off. i think that CL60 is working great here.
* deadly silence, no hiss no hum.
* 47°C on bottom heatsink at nearest irfp, 45°C on irfp plastic body, measured with laser temp meter. room temp is 28°C.
6L6 build guide is helping me so much, which make me trouble free untill now
Nice work mate.
If you have 2sj74 then use those.
If you have LSJ74 then use those.
Both are suitable.