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Aleph J illustrated build guide
Aleph J illustrated build guide
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Old 17th August 2019, 11:16 PM   #3751
6L6 is offline 6L6  United States
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Aleph J illustrated build guide
A CL-60 from PSU ground to chassis will lift the PSU off the safety earth by about 10ohms, which in theory should minimize a ground loop coming through the IEC earth.

Your step 2 should be removing the speaker protection board and wiring the speaker posts directly to the amp boards.
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Old 18th August 2019, 12:57 AM   #3752
marantzfan is offline marantzfan  United States
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Quote:
Originally Posted by 6L6 View Post
A CL-60 from PSU ground to chassis will lift the PSU off the safety earth by about 10ohms, which in theory should minimize a ground loop coming through the IEC earth.

Your step 2 should be removing the speaker protection board and wiring the speaker posts directly to the amp boards.
Thats exactly the order I was planning to proceed in. Thanks again 6L6!
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Old 18th August 2019, 06:21 PM   #3753
marantzfan is offline marantzfan  United States
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Ok. I installed the thermistor inline with the PSU ground and while I was at it, I removed the speaker relay board and tidied up the wiring a bit more.

Connected to my preamp and speakers and I get very, very faint hum; about what I'm accustomed to with my 2A3 SET amplifier. So, I'm calling it good.

I sat down and listened for a little while today and I have to say, the resolution of this amplifier is really quite remarkable. I'm looking forward to spending more time with it and at some point, perhaps building the B1 with Korg Triode if that is a good match.

Thank you to everyone for your help in getting things straightened out, I truly appreciate it.
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Old 18th August 2019, 06:52 PM   #3754
6L6 is offline 6L6  United States
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Aleph J illustrated build guide
Absolutely fantastic news!!!!!!!!

Congratulations!

Continue listening and enjoying - it only gets better from here. The AJ is a remarkable amplifier.
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Old 18th August 2019, 08:06 PM   #3755
marantzfan is offline marantzfan  United States
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Quote:
Originally Posted by 6L6 View Post
Absolutely fantastic news!!!!!!!!

Congratulations!

Continue listening and enjoying - it only gets better from here. The AJ is a remarkable amplifier.
Thanks 6L6, I can already tell this one is special and look forward to more listening.

Interestingly enough, removing the speaker relay board has minimized the turn off thump pretty dramatically to where now it's very subtle.
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Old 18th August 2019, 08:11 PM   #3756
TungstenAudio is offline TungstenAudio  United States
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Old 29th August 2019, 05:18 PM   #3757
ItsAllInMyHead is offline ItsAllInMyHead  United States
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Hi All -

I am at the final stages of the board population for the AJ.

I am learning from this group to always re-confirm everything. I've read this thread from front to back, and clearly I may have missed something. So before I may fry some really expensive JFETs, help is appreciated.

Below is a portion of the datasheet I found for the 2SJ74. I have blindly in the past followed the "shape" on the boards for components like this, but building a few other designs, it has been stressed to always check the datasheet for which legs are which.

Screen Shot 2019-08-29 at 12.04.26 PM.png

Link to full data sheet
https://www.mouser.com/ds/2/408/6903-18063.pdf

Per the datasheet (I think) - these would go "backwards" to the silhouette on the boards.

I pulled up the datasheet for the LSJ74, and they seem to be "opposite" and/or aligned with the board.

Could someone please confirm and/or tell me I'm paranoid/wrong
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Old 29th August 2019, 05:23 PM   #3758
Zen Mod is offline Zen Mod  Serbia
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Aleph J illustrated build guide
that datasheet is showing:

when you look at face of part , where print is , legs down , then 1 is most left and 3 is most right

so , from left - D,G,S

lower part of pic is part looked from bottom - pins pointing at you
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Old 29th August 2019, 05:24 PM   #3759
bk856er is offline bk856er  United States
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I once got tricked by "top view vs. bottom view" datasheet pinout diagram!

BK
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Old 29th August 2019, 05:27 PM   #3760
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cheap component testers from China (10-20 bucks) are clever investment nowadays

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