The postal service to USA is often unpredictable. I had few cases when it took close to a month for a small package, air mail delivery.
power up my Aleph30
What's the best way to power up my amp. I've 2 toroids of 2x18V- 300VA and 1of 2x18-500VA
What's the best way to power up my amp. I've 2 toroids of 2x18V- 300VA and 1of 2x18-500VA
pcb still available
Hi Peter,
I'm wondering if you still have some pcb available. If yes, I'd like to order two. I've just sent you an e-mail but was not sure if the webmail if working correctly.
Regards,
Olivier
Hi Peter,
I'm wondering if you still have some pcb available. If yes, I'd like to order two. I've just sent you an e-mail but was not sure if the webmail if working correctly.
Regards,
Olivier
I just replied to your e-mail. There approx 4 boards left at the moment. One board is good for two channels.
hot hot HOT
I thought my amp was very hot. I've never had an amp run this hot before and was a bit nervous so........
I borrowed a few thermistors from work and fastened them onto various components inside and outside the amp, closed it up and played it for 2 hours.
The top of the IRFP240's got as high as 67C, the tab of a 9610 on the differential pair got to 82C, ambient inside the amp was 48C, temp on the hottest spot of the heatsink was 55C.
These readings surprised me as I can barely hold the palm of my hand against the heatsink for more than a few seconds
yet the temp on the 240 suggests my heatsinking is OK.
Question: is the tab temp on the 9610 a little high at 82C as the spec says absolute max is 150C at the junction.
BTW fantastic sounding amp 😀 😀 😀 😀 😀
Kev
I thought my amp was very hot. I've never had an amp run this hot before and was a bit nervous so........
I borrowed a few thermistors from work and fastened them onto various components inside and outside the amp, closed it up and played it for 2 hours.The top of the IRFP240's got as high as 67C, the tab of a 9610 on the differential pair got to 82C, ambient inside the amp was 48C, temp on the hottest spot of the heatsink was 55C.
These readings surprised me as I can barely hold the palm of my hand against the heatsink for more than a few seconds
yet the temp on the 240 suggests my heatsinking is OK.Question: is the tab temp on the 9610 a little high at 82C as the spec says absolute max is 150C at the junction.
BTW fantastic sounding amp 😀 😀 😀 😀 😀
Kev
Ultrafast cross atlantic delivery , nice boards indeed.
Peter is the man.
Is there any parts list available to clone ?
Peter is the man.
Is there any parts list available to clone ?
Re: hot hot HOT
just place one mutual heatsink for both 9610.....even Alu plate is good enough 😉
KevinTams said:
just place one mutual heatsink for both 9610.....even Alu plate is good enough 😉
Re: hot hot HOT
No problem. Keep the junction below 100'C and your're in good shape.
Q1/Q2 junction temp: 82'C + (0,3W x 6,4'C/W) = 84'C 😉
KevinTams said:
No problem. Keep the junction below 100'C and your're in good shape.
Q1/Q2 junction temp: 82'C + (0,3W x 6,4'C/W) = 84'C 😉
Stupid question from me to all of you so I don't have to go back thorugh all the posts to find out but what type of 1/4 watt resistors this board laid out for? I have yet to use these little doggies yet and am curious.....
Thanks!
Mark
Thanks!
Mark
The stuffing info was posted here: http://www.diyaudio.com/forums/showthread.php?postid=617068#post617068
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