That's great! In the last couple of months I was busy finishing the Iron Pumpkin pre, so I had no time for the Aleph 60 - but now!
Only the xformers are missing (and the case), so before I order, I wanted to clarify the required power. Am I right - based on the sheet above -, that a 300va xformer per channel will do the job? I planned with 400va, but they have the issue with the high inrush current which requires a limiter. So, will 300va go? And if so, what would be the value for the snubber resistor?
Many thanks in advance.
using inrush current limiter is a must with Donuts above, say, 150VA
go figure
Aleph 60, being ~160W of heat per channel, I wouldn't go bellow 400VA Donut , twice
hope you're making it with J FE
go figure
Aleph 60, being ~160W of heat per channel, I wouldn't go bellow 400VA Donut , twice
hope you're making it with J FE
JFet Fe, considering number of output mosfets, ideally buffered
meaning - JFet FE with follower in between JFet (drain) and output mosfets
meaning - JFet FE with follower in between JFet (drain) and output mosfets
Mighty ZM covered most. What snubber value depends on the donut you buy.
If you go for Antek, use a 20R.
If you buy Toroidy or others, you'll need to measure on a quasimodo, check the quasimodo results thread (maybe it's there?), or someone will need to chip in with the information.
there is also thread "aleph reloaded" or something as that
few short tips and tricks, given by Pa, how to make it better
The CL60 on the CL60/AC-Cap board is the inrush current limiter.
The other CL60 to ground is the hum buster.
If you're using the CL60/AC-Cap board, you're covered.
Regarding the "Aleph Reloaded" thread. Have a look and notice that some key elements are included in the boards and build doc.
Not what you asked, but the FQP3P20's work very well in my hands.
Anand, you can try member prakit:
https://www.diyaudio.com/community/members/prakit.24874/
He actually had some matched 2sj313 pairs for sale recently so you might ask if he has any more.
Cheers,
Dennis
Dennis,
Referencing to the link of the ‘Aleph Design Reloaded‘ on post #433:
If I am unable to procure the 2SJ313 matched pairs, but am able to buy a bunch of FQP3P20’s (which appear to be plentiful) and given the current source (CS) being 20-22mA in the Aleph 60 input stage (5V across resistor R11: 220R), would I match the FQP3P20’s for 10mA so they can equally share the current from the CS as closely as possible?
I typically use either AMB Audio’s guide or Pass’ guide right here.
Thanks,
Anand.
I’ve got you covered if you don’t feel like matching. These are already matched.
Attachments
Woohoo! Beam me up! I don’t see it on your Etsy page, so can we discuss via email?
Best,
Anand.
Since you brought it up, I had noticed originally you had incorporated Papas suggestions from the Aleph Reloaded thread. The one thing that stayed on your plans and he discussed deleting was Q4 and the associated R15 and R16, or the protection circuit. I'm guessing the upside of leaving this alone is retaining its protection effect. But I the proposed benefits of eliminating these 3 parts? Clearly Papa thought there was a little juice to be squeezed by dropping them.