Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 29th January 2018, 07:52 PM   #21
pcgab is offline pcgab  United States
diyAudio Member
 
Join Date: Dec 2014
Location: San Marcos, Texas
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Quote:
Originally Posted by xrk971 View Post
Just an update that the Master layout artist JPS64 is on the case. He will make two layouts: the 20W board and the 55W board. I think the 20W made to allow compatibility with the DIYA Store’s UMS specification might be a good idea? Whilst the 55W is strictly CPU cooler territory. I don’t think anyone wants a passive heatsink that can handle 300w per channel.

So outputs will be three per side closely spaced to all fit on copper block of the Dell surplus workstation heatsinks good for 130w to maybe 150w per side. The Dell FD841 heatsink designed for Xeon 5500 cpu’s Is supposed to be good for 130w with heatsink at 41C. We can tolerate 55C heatsink temps so perhaps can push 150w or slower fans speeds.
Excited to see what JP comes up with for layouts. Having both boards at least having a mounting pattern of 10mm x 10mm (and multiples, obviously) would be awesome. I think that's part of the UMS standard, and all the inexpensive, readily available base plates for sale in the diyAudio store are 10mm x 10mm.

I just bought a few of those heatsinks.

A couple of quick questions.

Do you think those Dell heatsinks could handle ~50w output without the need for a fan?

IIRC, the ~50w version needs ~35v rails? Would a 28v or 30v transformer work? Something like:

AS-4430 - 400VA 30V Transformer - AnTek Products Corp

I have a couple extra diyAudio store universal power supplies with 8x 22000uF 50v caps, and fep30dp rectifiers, that I was hoping to use one of, if appropriate.

Thanks~
~Gable

Last edited by pcgab; 29th January 2018 at 07:57 PM. Reason: wrong recitiver
  Reply With Quote
Old 29th January 2018, 08:41 PM   #22
pcgab is offline pcgab  United States
diyAudio Member
 
Join Date: Dec 2014
Location: San Marcos, Texas
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Read the thread again, and have answered one of my own questions. Will need fans with those heatsinks for ~50w output.
  Reply With Quote
Old 29th January 2018, 08:49 PM   #23
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Yes, the fins are very thin and narrow and rely on motion to convect heat away. Think about how big a passive sink has to be to handle 150w. The 4U x 300mm Dissipante sink is good for 60w. Even 75w requires the 5U.

You can get UMS sinks without the case?
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 29th January 2018, 08:54 PM   #24
pcgab is offline pcgab  United States
diyAudio Member
 
Join Date: Dec 2014
Location: San Marcos, Texas
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Quote:
Originally Posted by xrk971 View Post
Yes, the fins are very thin and narrow and rely on motion to convect heat away. Think about how big a passive sink has to be to handle 150w. The 4U x 300mm Dissipante sink is good for 60w. Even 75w requires the 5U.

You can get UMS sinks without the case?
That makes sense.

You can order from diyaudio store:

UMS 40mm Heatsinks – diyAudio Store
  Reply With Quote
Old 29th January 2018, 08:55 PM   #25
pcgab is offline pcgab  United States
diyAudio Member
 
Join Date: Dec 2014
Location: San Marcos, Texas
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
I think I'm going to try the 20w version, they'll likely be powering my mid and hf horns, so 20w is more than ample.
  Reply With Quote
Old 29th January 2018, 09:42 PM   #26
drpro is offline drpro  United States
diyAudio Member
 
Join Date: Jan 2014
Location: Nashvegas
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
I am guessing two of the Dell heatsinks are needed for stereo.
  Reply With Quote
Old 29th January 2018, 09:46 PM   #27
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
No, four. 300w per channel heat output.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote
Old 29th January 2018, 09:56 PM   #28
drpro is offline drpro  United States
diyAudio Member
 
Join Date: Jan 2014
Location: Nashvegas
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Wow, some serious firepower!!
  Reply With Quote
Old 29th January 2018, 10:51 PM   #29
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
I am very interested too. Since many years i am looking for a low powered, Class A poweramp that i will use to drive higher efficiency speakers.
Ihis could be it.
  Reply With Quote
Old 30th January 2018, 12:03 AM   #30
xrk971 is online now xrk971  United States
Got Foam?
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Metro DC area
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
The 55w one is kind of over the top but that’s what makes it interesting. Over the top without breaking the bank. Nice for cold rooms in the winter. I kid you not, I have a cold barely heated room in the house for my office and I put my (70w total dissipation) Class A amp on the floor and rest my feet with socks on it (too hot for no socks) for warmth.

I envision that this amp will have kind of “Bladerunner” look to it with the exposed heatpipe radiators and fans.
__________________
XRKaudio https://www.etsy.com/shop/XRKAudio
  Reply With Quote

Reply


Aksa Lender P-mos Hybrid Aleph (ALPHA) AmplifierHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
AKSA's Lender Preamp with 40Vpp Ouput GB xrk971 Group Buys 417 Yesterday 06:58 AM
AKSA's Lender Preamp with 40Vpp Output xrk971 Analog Line Level 861 18th October 2018 12:03 PM
Aksa Lender HPA xrk971 Headphone Systems 50 30th August 2018 01:26 PM
Help newbie with low budget Magnificat/MLTL hybrid project AN8 + Eminence Alpha 10? klykx Full Range 1 9th October 2006 03:22 PM
AKSA vs Aleph or Aleph-X Prune Pass Labs 20 11th March 2004 03:05 PM


New To Site? Need Help?

All times are GMT. The time now is 10:02 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki