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Aleph J illustrated build guide
Aleph J illustrated build guide
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Old 12th April 2018, 12:06 AM   #2611
Ben Mah is offline Ben Mah  Canada
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That IEC power socket looks dangerous - the connecting power cord would need exposed power pins. Fortunately standard power cords do not have exposed power pins and would not fit that socket.
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Old 12th April 2018, 12:08 AM   #2612
mkane77g is offline mkane77g  United States
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Aleph J illustrated build guide
Haven't put together the ps yet. The bottoms open. It will have footers. I'll take some measurements when it's time.
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Old 12th April 2018, 12:13 AM   #2613
mkane77g is offline mkane77g  United States
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Aleph J illustrated build guide
Quote:
Originally Posted by Ben Mah View Post
That IEC power socket looks dangerous - the connecting power cord would need exposed power pins. Fortunately standard power cords do not have exposed power pins and would not fit that socket.
That's going in the trash. I see where you're coming from. Thanks
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Old 14th April 2018, 12:19 AM   #2614
mkane77g is offline mkane77g  United States
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Aleph J illustrated build guide
And the wood piece I now have where the input/outputs are located will be changed out to a 4mm piece of aluminum for an easy grounding location.
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Old 20th April 2018, 06:51 PM   #2615
twitchie is offline twitchie  Canada
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Quote:
Originally Posted by Dennis Hui View Post
The standard substitution is a matched pair of 2sj74 or lsj74. Matched pairs of lsj74 are available at the diyaudio store.
Is there a preferred Idss for J74 pair for Aleph-J? In general, given the spread from 6-12mA are the higher ones more desirable or lower values (not just for AJ) if such a generalization or observation is possible? Thanks!
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Old 20th April 2018, 07:03 PM   #2616
6L6 is offline 6L6  United States
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Aleph J illustrated build guide
Not really, aside from reasonably well-matched and BL grade (6-12mA Idss) ‘

The CCS in the circuit controls the Jfets more than their Idss
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Old 20th April 2018, 07:22 PM   #2617
twitchie is offline twitchie  Canada
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Thanks 6L6, matching only needs to apply to the channel, they don't need to match left/right is that correct?

Last question - if they were matched at 9V (on battery), how well does that matching hold up as implemented in the AJ? Would it be necessary to match at (what is the voltage?) the voltage it would see in the AJ?
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Old 20th April 2018, 07:50 PM   #2618
Zen Mod is offline Zen Mod  Serbia
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Aleph J illustrated build guide
just channel , 9V battery OK for everything
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Old 20th April 2018, 08:06 PM   #2619
twitchie is offline twitchie  Canada
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Thank you Mighty ZM!
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Old 22nd April 2018, 03:44 PM   #2620
cosmo61 is offline cosmo61  Sweden
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Thank's 6L6 for your excellent instructions how to build the Aleph J.
The amp sounds really good with my speakers.
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