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Old 5th February 2013, 10:20 PM   #131
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I could do it. I can easily swap in the amp board the way I made my F5 with the UMS 4U chassis.

I have the J74s - needs a quick Mouser order for the IRFP240s and and rest.
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Old 6th February 2013, 04:26 AM   #132
henryve is offline henryve  South Africa
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I have a nice Amplimo 625VA transformer for this project as well as about 20 IRFP240 MOSFETs, a matched pair of 2SJ74BLs from Spencer but no heatsink, caps and resistors. I am to pull the trigger on my caps order from Mouser.

The heatsink is the killer for me at the moment.

Last edited by henryve; 6th February 2013 at 04:54 AM.
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Old 7th February 2013, 02:13 AM   #133
6L6 is offline 6L6  United States
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I am very grateful to those of you who answered my call to build the prototype. One member has all the components on hand, as he was about to begin an Aleph J build using one of the other PCB.

Thank you Grimberg!
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Old 7th February 2013, 05:07 AM   #134
henryve is offline henryve  South Africa
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Do we have a prelimary BOM for this PCB yet? Or is it the same as the original? I would like to complete my order at Mouser all in one go as a $60 charge for shipping small orders is not fun for us here down south in the bundus.
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Old 7th February 2013, 05:39 AM   #135
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It is the same as the original.

Didiet
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Old 7th February 2013, 05:42 AM   #136
henryve is offline henryve  South Africa
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Thank you
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Old 7th February 2013, 01:43 PM   #137
henryve is offline henryve  South Africa
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6L6

Do you by any chance know if this board can accomodate Dale RN60s? I know that RN55s will probably be OK for the AJ, but when I buy resistors from Mouser I usually get a 100 at a time since shipping is expensive to here, so usually use the purchase for stocking up for other projects as well, and RN60s is a good alrounder.

I know it was discussed earlier in the thread, by I can't confirm if the spacing is adequate. You would need at least a pin spacing of 12mm for the RN60s. 10mm is too small and I hate having to mount resistors standing up. If the spacing is 10mm I will have to go for the RN55s.
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Old 7th February 2013, 01:59 PM   #138
6L6 is offline 6L6  United States
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I think that the spacing is adequate for RN60 in most positions. The spacing was the same as the F4, which will fit them. (and PRP, and some of the other fancy expensive audiophile resistors.) Although you mention that you don't prefer it, you can always mount them standing up.

I have a bunch of RN60 on hand and will verify when I finally receive the boards.

The BOM should be similar to the original circuit, the changes to the PCB are pads for pots and resistor where there was originally just a resistor, places for film bypasses across the electrolytics, and a few spots for additional resistors if you have oscillation problems, which 99% of people will not use and just use a jumper.

EDIT - If you are trying to get everything on one order you might want to look back at the last posted PCB drawing and schematic - it will show the places where the pots and such are. The schematic numbering is similar to the original (Nelson's 'General Amplifier') schematic. The schematic I posted towards the beginning has been the basis of this whole project, although I mis-marked the pot on R7, it should be 500ohm, not 500K.

Also, if you would like to make a BOM, for the new board, that would be warmly received. I am a 'work off the schematic' kind of guy, and would love for somebody to make (or at least start) a BOM. My only request would to make it from Mouser.

Last edited by 6L6; 7th February 2013 at 02:12 PM.
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Old 7th February 2013, 06:26 PM   #139
henryve is offline henryve  South Africa
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Good, I will work on something. At least it will be my first contribution to DIYAudio.
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Old 7th February 2013, 06:33 PM   #140
6L6 is offline 6L6  United States
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Thank you ! That's great, I and the community greatly appreciate it.
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