AV800 rails - 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 10th June 2004, 12:08 PM   #1
Anvil is offline Anvil  Finland
diyAudio Member
 
Join Date: May 2003
Location: Oulu
Lightbulb AV800 rails

Hi. Can I run AV800 on +- 83 V rails or +- 76 V rails without any modifications? Rails are normally +- 90 V. I donīt need all that power and lower rails mean more current from transformer of same power Current is nice

Anvil
  Reply With Quote
Old 10th June 2004, 12:11 PM   #2
diyAudio Member
 
Join Date: Aug 2002
Location: Farmington, CT
Send a message via AIM to Mattyo5
Sounds like a good idea to me Someone correct me if i'm wrong, but should be no problem to run with lower rails. Probably better overall, and cheaper... those higher voltage power supply capacitors are not cheap. Good luck!

-Matthew K. Olson
  Reply With Quote
Old 10th June 2004, 09:27 PM   #3
diyAudio Member
 
Join Date: Feb 2001
Location: Mars
I think Holton mentioned it was ok to run lower rails,
search the archives to verify. I think it was in reference
to bridging the AV800, he recommended lowering the rails
to maybe 75v.

Post pics and listening impressions when done.


  Reply With Quote
Old 11th June 2004, 06:11 PM   #4
Anvil is offline Anvil  Finland
diyAudio Member
 
Join Date: May 2003
Location: Oulu
Default help

I cant find that thread. Can you find that? What happened to your "terawatt" projects? Can you post some pictures of your projects, if you have any?

Anvil
  Reply With Quote
Old 11th June 2004, 10:04 PM   #5
K-amps is offline K-amps  United States
diyAudio Member
 
K-amps's Avatar
 
Join Date: Nov 2003
Location: Indiana
Lower rails should not be an issue as long as your set the bias current and DC offset correctly.

Also lower rails do not mean more current (unless you lower the load impedance as well, in both cases, it is a function of load not rail amplitude.)

On a personal note, I find lower rails have a softer sound with less glare. However if the motivation is to avoid blowing your speakers, then we get into the old "will clipping destroy speakers quicker than a high powered amplifier" argument.

Good luck!
  Reply With Quote
Old 12th June 2004, 07:20 AM   #6
Anvil is offline Anvil  Finland
diyAudio Member
 
Join Date: May 2003
Location: Oulu
I mean more current from the transformer, because the VA:s stay the same and voltage is lowered.

Anvil
  Reply With Quote
Old 12th June 2004, 10:33 AM   #7
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
Default rails will sag to that level anyway

no problem as far as i can see...
__________________
the best advertisement for a good audio design is the number of diy'ers wanting to build it after all the years....never the say so of so called gurus....
  Reply With Quote
Old 12th June 2004, 02:15 PM   #8
K-amps is offline K-amps  United States
diyAudio Member
 
K-amps's Avatar
 
Join Date: Nov 2003
Location: Indiana
Quote:
Originally posted by Anvil
I mean more current from the transformer, because the VA:s stay the same and voltage is lowered.

Anvil
Anvil,

I am not an expert, heck I am not even an Engineer, but I believe lowering voltage will decrease VA rating because maximum current that can be delivered from a given gauge of secondary coil is fixed. Meaning you cannot extract more current from the coils than rated.

The second variable is the saturation of the core, maybe thats what you were referring to.

Lastly with increased flow of current, the Toroid begins to heat up because of several variables, usually this is the limiting factor in most commercial Toroids as far as VA rating goes, This might also be what you were referring to.

Any Tranny experts might shed better light on this,

regards,

K-
  Reply With Quote
Old 12th June 2004, 02:30 PM   #9
Anvil is offline Anvil  Finland
diyAudio Member
 
Join Date: May 2003
Location: Oulu
I simply mean that transformer with lower secondaries but same VA gives more current, because P = U * I.
  Reply With Quote
Old 12th June 2004, 02:33 PM   #10
K-amps is offline K-amps  United States
diyAudio Member
 
K-amps's Avatar
 
Join Date: Nov 2003
Location: Indiana
Quote:
Originally posted by Anvil
I simply mean that transformer with lower secondaries but same VA gives more current, because P = U * I.



P might mean U * I but if I is fixed, lowering U will lower P.
  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
AV800 Amp Jitterbug Solid State 9 16th July 2010 10:14 AM
av800 pcb need help!!!! ashokavarthanan Solid State 12 10th October 2007 01:12 AM
av800 amp please help!!!! smokingmachine Solid State 3 7th June 2006 10:36 PM


New To Site? Need Help?

All times are GMT. The time now is 06:52 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2