A baby giant is borne... - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 18th July 2006, 11:36 PM   #1
folkeb is offline folkeb  Norway
diyAudio Member
 
Join Date: Jan 2006
Location: Trondheim
Default A baby giant is borne...

At last - after a lot of hassel we connected the Aleph 1.2 and fired it up. It is not finished. Actually, we only tested it up to 25 volts. The resistors (25 w 0,3 ohms) seemed very varm so we didn't dare up the voltage. But anyhow - we connected the amp - as of now occupying the whole living room - to a set of cheap speakers and flipped the switched. (Had checked for DC (0v) and 10k input). Music for all to hear!!! It is still a long way to the end, but at least the amp does play music. To early to say anything about the sound as I only have one amp running just over 1/3 of the rated voltage. The bass was deep, but it seem all a bit forward. Shouldn't even think about the sound yet!!

Still remains the issue of harnesing the voltage and keeping it below 60 volts. (see my other thread).

Good night and good luck to all - I'm one happy guy
  Reply With Quote
Old 19th July 2006, 07:06 AM   #2
folkeb is offline folkeb  Norway
diyAudio Member
 
Join Date: Jan 2006
Location: Trondheim
I'd thought I post some images of the test setup:

http://i40.photobucket.com/albums/e2...h/DSC_0150.jpg
http://i40.photobucket.com/albums/e2...h/DSC_0153.jpg
http://i40.photobucket.com/albums/e2...h/DSC_0154.jpg
http://i40.photobucket.com/albums/e2...h/DSC_0155.jpg

I know it looks like a mess, but it seems to work.
  Reply With Quote
Old 19th July 2006, 11:37 AM   #3
VT67 is offline VT67  Belgium
diyAudio Member
 
VT67's Avatar
 
Join Date: Jun 2004
Location: Belgium
folkeb

That amp is coming along nicely.
I have the same coark coasters (pic DCS_0155.jpg), didn't knew they were audiophile stuff! Gonna try them in my amp too

Regards
  Reply With Quote
Old 19th July 2006, 12:01 PM   #4
diyAudio Member
 
Join Date: May 2006
Default Watts rms ?

Just curious, how many watts (rms) are you pushing with this ?
I am building a 200W rms guitar amp for my son, am working on the pcb,s now. Power supply is done.
Your project is looking real nice.
__________________
If you believe you " can't " you are absolutely right!!!!!!!!!!!!!!
  Reply With Quote
Old 19th July 2006, 01:38 PM   #5
folkeb is offline folkeb  Norway
diyAudio Member
 
Join Date: Jan 2006
Location: Trondheim
The Aleph 1.2 should be 200w pr channel(8ohms). It will be slightly less as I plan to reduce the voltage to about 58, instead of 60v. Each monoblock will draw just under 500w from the socket.
  Reply With Quote
Old 19th July 2006, 05:12 PM   #6
diyAudio Member
 
Join Date: Jan 2006
Location: Hot and Humid
Default Inspiration

Folkeb,
You are my inspiration. Its time for me to get off my butt and return to building my amp. In this day and age of Xs, XAs, Aleph Xs, ZENV9s.... its nice to know that there are still some out that that hold on to the original Alephs!

I am so glad that you have solved your other issues quickly. Have you done the calculations to determine the correct wattage for the resistor? As I also have the similar 25watt 0.39ohm Arcol resistors for my CRC filter.
__________________
Seize the day
  Reply With Quote
Old 19th July 2006, 07:01 PM   #7
folkeb is offline folkeb  Norway
diyAudio Member
 
Join Date: Jan 2006
Location: Trondheim
Thank you for your kind words. I have just tested the Aleph with 59 volts on the rails and 229 on the variac. This was with one 0,3 ohm resistor in the system. So I am getting close. I hope that one more in series will do the trick.

The sound:

It is not easy to evaluate the sound from one channel, but I will try. The bass went a lot deeper and was at the same time slightly more punchy as well as a lot more detailed than my Electrocompaniet 250R power amp. The midrange seemed very nice indeed and the top end I can't realy say anything about. Stereo was obviously not too good... It seemed to be a lot more rythm to the music.

After about 30 minutes playing the heatsinks were warm, but not hot as I expected. Maybe they need longer to heat up, or I have bought over the top heatsinks (maybe a combination of both). Anyhow, this is good as it enables me to place the amps out of harms way and eyesight (not mine...)! I have even bought 12 fans as precaution, no need for them anymore!!


The other problems will be solved, of this I am sure. It may take some time . I'll write more on this in the more techy thread I have going.
  Reply With Quote
Old 20th July 2006, 08:52 PM   #8
steenoe is offline steenoe  Denmark
diyAudio Member
 
steenoe's Avatar
 
Join Date: Mar 2004
Quote:
The Aleph 1.2 should be 200w pr channel(8ohms).
Just to make sure; the 200 watts of an Aleph amp is rated at Single Ended Class A! That spell's: monster-amp!. A 200 watt guitar amp is next to nothing in comparison You can have those in any Discount-supermarket!! Hats off to Folkeb Quite impressive job!

Steen
  Reply With Quote
Old 21st July 2006, 01:49 AM   #9
moe29 is offline moe29  United States
diyAudio Member
 
moe29's Avatar
 
Join Date: Dec 2002
Location: Florida
Send a message via AIM to moe29 Send a message via Yahoo to moe29
...i was thinking those heat sinks don't look big enough!

if they stay reasonable after one hour of warmup you should be ok!



(reasons i stayed away from Aleph 1.2)

- way too many holes to tap for FETS!

- way too many FETS to match!



good job folkeb!
  Reply With Quote
Old 21st July 2006, 08:44 AM   #10
folkeb is offline folkeb  Norway
diyAudio Member
 
Join Date: Jan 2006
Location: Trondheim
The C/W ratio for each amp is 0,06. The heatsinks aren't your regular heatsink, they have ragged fins that greatly increase their efficiency. They should be sufficient. But then again....

The heatsinks are Fischer SK535 (500mm x 200mm x 85mm).
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Giant BIB's For Sale in MN pjanda1 Swap Meet 3 9th July 2009 02:20 AM
Giant Subwoofer? zenmasterbrian Subwoofers 395 18th February 2009 10:21 PM
Structure- and air-borne vibration in turntables andy19191 Analogue Source 4 11th June 2006 11:25 AM
Structure-borne sound converter? DolbyR Car Audio 0 6th May 2006 05:55 PM


New To Site? Need Help?

All times are GMT. The time now is 04:58 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2