I won't make the same mistake twice by waiting too long (having only discovered the Sony VFet 2 years ago) The CSX1 was circa 2013 and just finished building it less than 3 months ago:
My Sony VFET CSX1 Adventures & Grief !
There are PLENTY of unused VFets floating around the world ; stuck in drawers or storage bins. How do we price these Vfets ? or will they continue to be hoarded for higher prices as no one seems to want to sell them? As an option, the price offering in the next VFet amp should set the price level. If it's too low, then you will find most of these VFets will be left hoarded. If it's too high, then most DIYers would probably not build it. :| Opinion?
My Sony VFET CSX1 Adventures & Grief !
There are PLENTY of unused VFets floating around the world ; stuck in drawers or storage bins. How do we price these Vfets ? or will they continue to be hoarded for higher prices as no one seems to want to sell them? As an option, the price offering in the next VFet amp should set the price level. If it's too low, then you will find most of these VFets will be left hoarded. If it's too high, then most DIYers would probably not build it. :| Opinion?
I have some TO-3 laterals laying around that could be put to use.
If they won't work with this pcb, then I can always make a new pcb.
If they won't work with this pcb, then I can always make a new pcb.
How about using the Hitachi Laterals used in old Haflers- 2SK134 and 2SJ49?
They are not in production anymore but lots of Haflers exist and are easy to find, working and not.
They are not in production anymore but lots of Haflers exist and are easy to find, working and not.
You’re right, of course. But we’re kids before Christmas and we can’t stop talking or guessing about it.
Here are some of the semiconductors deployed in the optional front end daughter cards of the Sony VFET DIY amp. I feel certain that knowing these are used, will improve your guesses quite substantially. Have fun, enjoy, you're welcome.
Please observe that the diode part number contains three copies of the digit "4" -- it's the diode from the famous Giovanni Stochino super-slewer power amp, undoubtedly not the diode you used in previous projects.
_
Please observe that the diode part number contains three copies of the digit "4" -- it's the diode from the famous Giovanni Stochino super-slewer power amp, undoubtedly not the diode you used in previous projects.
_
😕
Someone interpret this for me please. I have no idea what any of that means or what design uses the combination of those 3 components.
The suspense is killing me!
I admit that one of the criteria I used (among many others!) to choose semiconductors for these optional Front End input stage daughter cards, was: Likelihood Of Counterfeiting. I made an effort to prioritize devices that are relatively infrequently seen / sold on eBay and AliExpress and Amazon and BangGood. To prospective builders I say, just buy the legitimate, real thing. Put them on your Mouser order and sleep soundly.
Hunt for the counterfeit-unlikely weirdos on this list
Measuring the Early voltage "VA" of some PNPs at 8mA
Hunt for the counterfeit-unlikely weirdos on this list
Measuring the Early voltage "VA" of some PNPs at 8mA
Yes. Given the price and scarcity of the Sony VFETs, I am mounting the
output transistors and enough parts to protect them and allow a
functional test.
This kit is designed to be friendly to newbies as well as you sophisticates,
and this way there will be fewer tears.
Don't worry, there are parts to add, and you can still pick your own
caps. It's powered by a desktop supply and I designed a nice little
filter to take the noise out.
There will be options for five, count 'em, five front end designs,
one of which is my M2 input stage, and the others are Mark Johnson's.
(collect them all!)
And wait till you see the chassis....
Does Mr. Pass have some elves help?
400 channels are a heroic amouth of work.
I keep checking my front porch, but it's almost looking like the new amp won't be delivered by Christmas. ;-)
Hope all is well for everyone going into the holiday period, and coming out.
Hope all is well for everyone going into the holiday period, and coming out.
Wow - I just looked at the date of my last post, and was shocked to see it's coming up on 2 years!
I've been listening to B&W 805D3's, near field, with my Aleph J powering the tweeters, and the F6 running the mid/bass. I've been very happy with that configuration, and would stay with it if I weren't so darn curious.
Over the past 2 days, I ordered the parts to build the M2x with the Ishikawa front end. I looking forward to their arrival!
I wasn't able to find any IRFP240pbf's. I checked my supplies and realized I have a bunch of IRFP240's. Apparently, mine have lead. Who knew? 🙂
My plan is to use the PS/Chassis of the Aleph J for the M2x. If I like the sound, I'm going to go for dual mono - probably with all PS in the same chassis.
Thanks to all for your previous guidance. I'll probably need some more 🙂
I've been listening to B&W 805D3's, near field, with my Aleph J powering the tweeters, and the F6 running the mid/bass. I've been very happy with that configuration, and would stay with it if I weren't so darn curious.
Over the past 2 days, I ordered the parts to build the M2x with the Ishikawa front end. I looking forward to their arrival!
I wasn't able to find any IRFP240pbf's. I checked my supplies and realized I have a bunch of IRFP240's. Apparently, mine have lead. Who knew? 🙂
My plan is to use the PS/Chassis of the Aleph J for the M2x. If I like the sound, I'm going to go for dual mono - probably with all PS in the same chassis.
Thanks to all for your previous guidance. I'll probably need some more 🙂
(Just kidding...)
Thanks vdi_nenna. I already committed to the M2x, but am very interested in an AX after reading about them. It would be my first where I have to come up with more of the game plan myself - and I'd like that experience.