My new SC480 Pair - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 27th February 2006, 01:05 PM   #1
Dilby© is offline Dilby©  Australia
diyAudio Member
 
Join Date: Jan 2006
Location: Tasmania
Send a message via ICQ to Dilby©
Default My new SC480 Pair

Heres me first attempt at an amp..

2 SC480 modules
1 Speaker protector module
2 Power supply modules
1 300VA 30V Toroidal
In 19 inch rack case

50WRMS x 2 into 8ohm

Wiring needs to be tidied and thermal protection added, otherwise its finished..

To my ear sounds pretty good..

Dion.
Attached Images
File Type: jpg sc480.jpg (82.0 KB, 586 views)
  Reply With Quote
Old 4th March 2006, 08:50 AM   #2
Dazza is offline Dazza  Australia
diyAudio Member
 
Join Date: Feb 2005
Location: Sydney
Send a message via MSN to Dazza
That's a nice looking unit you have there. I have to admit the rack cases look good as well, and they are easy to work with as most have aluminium front and rear panels.
Nice work, keep it up.

Cheers

Daz
  Reply With Quote
Old 5th March 2007, 12:03 AM   #3
diyAudio Member
 
Join Date: Jan 2006
Location: Adelaide
I see you've used a 30V transformer here, rather than the 28V specified.

I've been considering the same thing...

Have you had any issues with it, such as overheating etc?

Were any modifications required to make it work?

Thanks!

- Peter
  Reply With Quote
Old 5th March 2007, 01:17 AM   #4
Dilby© is offline Dilby©  Australia
diyAudio Member
 
Join Date: Jan 2006
Location: Tasmania
Send a message via ICQ to Dilby©
Yes, thats right. I made no modifications. Originally I had 60 degree thermal switches on the heatsinks, it would turn off under heavy load. Upgraded to 90 degree switches and now gives no trouble at all. I notice one of the resistors on the board has discoloured a bit, but is no real cause for concern. Oneday I'd like to try a modified version with 21193/4 pairs in the output stage, upgraded drivers and front end with about 50v rails. I have enough 21193/4s to replace the 29/3055 devices, so I might do that oneday too.
Quoted from the SC website..
"The process basically involves increasing the main supply rails to ±50V, changing the output transistors to MJ15003/MJ15004 (TO-3 types), Q1-Q3 to BC556, Q4 & Q5 to BF469 and Q6 to BF470 and increasing the power supply capacitor values and voltage ratings to 63V. Naturally a much bigger transformer is also required."

I guess if you did use a 30v toroid and you had trouble, upgrading the devices would be the fix?
  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
SC480 Amplifier Kit Problem Stefan1 Solid State 22 15th September 2013 04:19 AM
SC480 Troubles.... Tensop Solid State 50 9th May 2010 11:34 AM
jaycar sc480 t03 ver 2 johndoe Solid State 1 17th November 2008 04:58 AM
SC480's trouble rotorhed Solid State 0 9th September 2007 05:07 PM
Modifying the SC480 for 2 ohm load guitar_joe Solid State 6 10th August 2007 06:09 PM


New To Site? Need Help?

All times are GMT. The time now is 09:27 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