Aksa Lender P-MOS Hybrid Aleph (ALPHA) Amplifier

Jump to Latest
Vunce

Vunce

Member
Joined 2014
Paid Member
Thank you everyone for the kind words. I was going for sort of a tube amp look. The tunnel would represent the metal cover over the power and output transformers. I certainly feel the ALPHA is deserving of a fine home. :)

Maty,
I will have holes in the base plate also, when the fan (one 120mm) blows across the coolers it will draw in fresh cool air from underneath in addition to blowing across them.
When I had test set up working on my bench, there is a few degree difference between the first and second heat sinks. (Only 3-5°C)
 
G

gaborbela

Member
Joined 2005
My computer crashed, I needed to reinstall all my software and Windows 7
I lost a lot of my work a couple software also, I did not make previously back up CD and now I do not find the original software.
Especially I miss my Sprint I have a dozen file saved I am no longer able to open those.
I downloaded the demo version but does not open any of my old files.
Maybe I saved it wrong those files or who knows.
I only used it to store and open up some Sprint files, I could not use the whole program.
To buy it again without knowing it will open my previously saved files would be a waste of $$.:eek:
I had a bad weekend at least my computer back and running again.:)
 

Attachments

  • IMG_0003.JPG
    IMG_0003.JPG
    87.6 KB · Views: 401
  • IMG_0002.JPG
    IMG_0002.JPG
    43 KB · Views: 400
T

tonza75

Member
Joined 2010
gaborbela said:
My computer crashed, I needed to reinstall all my software and Windows 7
I lost a lot of my work a couple software also, I did not make previously back up CD and now I do not find the original software.
Especially I miss my Sprint I have a dozen file saved I am no longer able to open those.
I downloaded the demo version but does not open any of my old files.
Maybe I saved it wrong those files or who knows.
I only used it to store and open up some Sprint files, I could not use the whole program.
To buy it again without knowing it will open my previously saved files would be a waste of $$.:eek:
I had a bad weekend at least my computer back and running again.:)
Click to expand...

System rescue cd or similar , i use linux mainly as we finland swedes mainly do .:cool:
I have windows 3.1,xp,7,10 but i like listening to the doors more!

'I am a cage, in search of a bird.'
 
T

tonza75

Member
Joined 2010
xrk971

xrk971

Founder of XSA-Labs
Joined 2012
etsy.com/shop/XRKAudio
Paid Member
That IEEE paper is a real eye opener. Now I see why they are called vertical MOSFETs and how so much current can be provided. Scaled up 2d NxN array with drain on the bottom flat substrate. Very neat to see how much tech is put into this to give us the ubiquitous IRFP240 for $1 ea. The IXYS units that can flow 80amps
And dissipate 1kW are simply amazing devices.

Thanks for the nice reading links.
 
xrk971

xrk971

Founder of XSA-Labs
Joined 2012
etsy.com/shop/XRKAudio
Paid Member
The big IXYS running 3amps when cooled by a good CPU cooler fitted with heatpipes runs at a cool 38C. That’s barely warm and it makes the whole B.B. amp appear like a gentle giant. There’s no scary heat emanating from it and no hot spots. I think Hugh’s advise to use a single TO-264 MOSFET capable of huge currents and dissipation vs matching a dozen IRFP240/9240 is super advice and I am glad the B.B. PCB embraces this fully. There is really no reason to use a bunch of smaller matched (or marginally matched or unmatched) MOSFETs. I think the sound quality would be better with a single one too.
 
danny_66

danny_66

Member
Joined 2005
Here's a lineup of the usual suspects
and the not so usual suspects:
I've included three of the new Ixys linear transistors.

Pick your N and P suspects :)

Code: 
                                               Gfs  Ciss    Crss   RdsOn   Rthjc Rthcs C/W
Fairchild FQA40N25  TO3PN  N  280W  40A  250V  29S  3100pF   70pF  70mOhm  0.45  0.24
Fairchild FDA69N25  TO3PN  N  480W  69A  250V  25S  3570pF   84pF  41mOhm  0.26  0.24
IXYS IXFH74N20P     TO247  N  480W  74A  200V  44S  3300pF  190pF  34mOhm  0.31  0.25
Fairchild FQA70N15  TO3PN  N  330W  70A  150V  48S  4150pF  135pF  28mOhm  0.45  0.24
IXYS IXTK88N30P     TO264  N  600W  88A  300V  60S  6300pF  190pF  40mOhm  0.21  0.15
Fairchild FQA28N15  TO3PN  N  227W  33A  150V  20S  1250pF   50pF  90mOhm  0.66  0.24
Fairchild FQA46N15  TO3PN  N  250W  50A  150V  36S  2500pF  100pF  42mOhm  0.60  0.24
Fairchild FQH90N15  TO3PN  N  375W  90A  150V  68S  6700pF  200pF  18mOhm  0.40  0.24
Fairchild FQA32N20C TO3PN  N  204W  32A  200V  20S  1700pF  185pF  82mOhm  0.61  0.24
IXYS IXTH64N10L2    TO247  N  357W  64A  100V  27S  3620pF  235pF  32mOhm  0.35  0.21 
IXYS IXTH80N20L     TO247  N  520W  80A  200V  45S  6160pF  520pF  32mOhm  0.24  0.21 
IXYS IXTH75N10L2    TO247  N  400W  75A  100V  44S  8100pF  350pF  21mOhm  0.31  0.21    

Fairchild FQA36P15  TO3PN  P  294W  36A  150V  19S  2550pF  110pF  90mOhm  0.51 0.24
IXYS IXTH52P10P     TO247  P  300W  52A  100V  20S  2845pF  275pF  50mOhm  0.42 0.21
IXYS IXTH48P20P     TO247  P  462W  48A  200V  32S  5400pF  170pF  85mOhm  0.27 0.21
IXYS IXTH50P10      TO247  P  300W  50A  100V  22S  4350pF  733pF  55mOhm  0.42 0.25
IXYS IXTH90P10P     TO247  P  462W  90A  100V  37S  5800pF  510pF  25mOhm  0.27 0.21
IXYS IXTK90P20P     TO264  P  890W  90A  200V  51S 12000pF  250pF  44mOhm  0.14 0.15
 
danny_66

danny_66

Member
Joined 2005
Here's a lineup of the usual suspects
and the not so usual suspects:
I've included three of the new Ixys linear transistors.

Pick your N and P suspects :)

Code: 
[SIZE="2"]                                               Gfs  Ciss    Crss   RdsOn   Rthjc Rthcs C/W  
Fairchild FQA40N25  TO3PN  N  280W  40A  250V  29S  3100pF   70pF  70mOhm  0.45  0.24
Fairchild FDA69N25  TO3PN  N  480W  69A  250V  25S  3570pF   84pF  41mOhm  0.26  0.24
IXYS IXFH74N20P     TO247  N  480W  74A  200V  44S  3300pF  190pF  34mOhm  0.31  0.25
Fairchild FQA70N15  TO3PN  N  330W  70A  150V  48S  4150pF  135pF  28mOhm  0.45  0.24
IXYS IXTK88N30P     TO264  N  600W  88A  300V  60S  6300pF  190pF  40mOhm  0.21  0.15
Fairchild FQA28N15  TO3PN  N  227W  33A  150V  20S  1250pF   50pF  90mOhm  0.66  0.24
Fairchild FQA46N15  TO3PN  N  250W  50A  150V  36S  2500pF  100pF  42mOhm  0.60  0.24
Fairchild FQH90N15  TO3PN  N  375W  90A  150V  68S  6700pF  200pF  18mOhm  0.40  0.24
Fairchild FQA32N20C TO3PN  N  204W  32A  200V  20S  1700pF  185pF  82mOhm  0.61  0.24
IXYS IXTH64N10L2    TO247  N  357W  64A  100V  27S  3620pF  235pF  32mOhm  0.35  0.21 
IXYS IXTH80N20L     TO247  N  520W  80A  200V  45S  6160pF  520pF  32mOhm  0.24  0.21 
IXYS IXTH75N10L2    TO247  N  400W  75A  100V  44S  8100pF  350pF  21mOhm  0.31  0.21    

Fairchild FQA36P15  TO3PN  P  294W  36A  150V  19S  2550pF  110pF  90mOhm  0.51  0.24
IXYS IXTH52P10P     TO247  P  300W  52A  100V  20S  2845pF  275pF  50mOhm  0.42  0.21
IXYS IXTH48P20P     TO247  P  462W  48A  200V  32S  5400pF  170pF  85mOhm  0.27  0.21
IXYS IXTH50P10      TO247  P  300W  50A  100V  22S  4350pF  733pF  55mOhm  0.42  0.25
IXYS IXTH90P10P     TO247  P  462W  90A  100V  37S  5800pF  510pF  25mOhm  0.27  0.21
IXYS IXTK90P20P     TO264  P  890W  90A  200V  51S 12000pF  250pF  44mOhm  0.14  0.15[/SIZE]
 
You must log in or register to reply here.
Top Bottom