Variac said:
and moi ... Count me in ... among the interested guys.
😉
(Even if I don't have the X board (was to young at the time and missed the GB 😀), don't have the BAF case, nor any 250's, etc...)
Manu
You mean my own 250's ...
I ll first try the J fet front end you posted, on a little daughter board, together with my A5 ...
Manu
I ll first try the J fet front end you posted, on a little daughter board, together with my A5 ...
Manu
Manu said:You mean my own 250's ...
I ll first try the J fet front end you posted, on a little daughter board, together with my A5 ...
Manu
I'll sort you out with 250's.
I still have a few that are not spoken for.
Only condition is that they are not just collecting dust.
Magura 🙂
Manu said:You mean my own 250's ...
I ll first try the J fet front end you posted, on a little daughter board, together with my A5 ...
Manu
Magura said:
it's not even hard or frightening to say ..... I like ya guyzzzzzz
Wel,l just to see if I get this right, you are talking about new version of X amp ?
If so I’m interested for some ;-)
(Why not. I have whole bunch of alephs so having one more could not hurt ;-))
What is with those IRFP 250? Are they hard to find?
If so I’m interested for some ;-)
(Why not. I have whole bunch of alephs so having one more could not hurt ;-))
What is with those IRFP 250? Are they hard to find?
yoke said:
nope ..... that is not new ; just look at last pages of few last active AlephX threads ..... boyz do that again and again ........
ya know - to vec i vrapci znaju ......
Zen Mod said:
nope ..... that is not new ; just look at last pages of few last active AlephX threads ..... boyz do that again and again ........
ya know - to vec i vrapci znaju ......
o.k. but you are talking about new set of PCB for the some sort of X amp which is diferent than alephX V1.0 PCB ?
yoke said:
nope , really ;
connected to "Burning Amp" topic , I'm working with AR2 on transfering his set of V1.0 pcbs to X with Jfet input ;
who knows ...... - Manu recently shows some excitement for constructing pcbs , and he is "pcblessles" for that project ...........
I am too lazy and too dumb for that sort of things .......
carpenter said:
I agree. The BrianGT boards look like they will work for this. I did an Aleph 2 and used an extra set of the external FET boards for the 2, so I have a spare set for the single FET version. Worth trying with some matched 250's I have and will see how it turns out.
To clarify further, the boards are Aleph X 1.0 so they are X'ed already, but Zenny is gonna help AR2 (and apparently a 100 other guys and their brothers - including me and my brother!) change the inputs to JFETS, the "latest thing" by slightly changing the boards. It shouldn't be a bunch of changes..
As I mentioned elsewhere, Nelson told me that the IRFP250's are just a TO-3 can with 2 IRFP 240 dies inside. Clearly you can use 240's but you need twice as many ( my math skills- amazing! ) Apparently they are pretty pricey these days, as I believe that they are no longer made. If you can't use TO-3 format you don't want IRFP250's
A major factor driving this is that a bunch of us got lovely and huge amp chassis' with heatsinks and power supplies donated by Nelson at the Burning Amp Festival. It is a bit more complicated because the chassis came with 240's and 9240's installed for a pushpull setup. But we also got pocketsful of IRFP250 MOSFETS so why not use them?
As I mentioned elsewhere, Nelson told me that the IRFP250's are just a TO-3 can with 2 IRFP 240 dies inside. Clearly you can use 240's but you need twice as many ( my math skills- amazing! ) Apparently they are pretty pricey these days, as I believe that they are no longer made. If you can't use TO-3 format you don't want IRFP250's
A major factor driving this is that a bunch of us got lovely and huge amp chassis' with heatsinks and power supplies donated by Nelson at the Burning Amp Festival. It is a bit more complicated because the chassis came with 240's and 9240's installed for a pushpull setup. But we also got pocketsful of IRFP250 MOSFETS so why not use them?
Variac said:
There seems to be some confusion about those TO-3 can parts.
The TO-3 can parts are IRF250, the IRFP240 and 250 are of the TO-247 package variety.
It's not all that complicated, as the parts that comes in both flavors, are named IRF-XXX for the TO-3 package, and IRFP-XXX for the TO-247.
Just to make sure you're all on the same page.
Magura 🙂
I think that is the page I am on. But to clarify, if I use the BrianGT board with one IRFP250 on each side (since the base BrianGT board holds is for a single set of TO-247's) instead of the two IRFP240's in the J schematic, I should be close.
Magura said:
something tells me it isn't
Could you go through my website?
Magura 🙂
I'll try in next few mins , to fwd last few sent ;
Thanks Magura! . Mine are IRF250's after all as I checked, confirming your info - they are in TO-3 packages. I will share my stash with others here in the Bay Area. No more dust!😉
hayenc said:
This solves the issue for creating an Aleph J. It seems the guys are creating a version of an Aleph JX with their old AX pcbs.
Fun stuff.