Bias adjustment for power amp? Help please - Page 2 - 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 28th August 2003, 03:17 PM   #11
cdl is offline cdl  Denmark
diyAudio Member
 
Join Date: Aug 2003
Location: Copenhagen
Hi,

Quote:
Originally posted by iso_510M
This may help.

20N10L Datasheet

Looks like heat should be a concern. P-tot is 105W but derate .7W/*C

Hmmm, you might be right. Actually, have been forced to exchange most of the 20N10L's with a newer HexFet type (20N10L is no longer available anywhere) - and I think the newer type might be better in that regard. But there's still the other channel...

Quote:

That is a familiar looking design. What amp is it?
It is the Aura PA-200.

Quote:
Originally posted by BobM
Why not call the manufacturer, get an engineer on the phone and ask what the bias should be for that model? Going "hotter" is not always better. Sounds like a better idea than blowing resistors to see how far you can push it.

Enjoy,
Bob
That's the fuss. Aura was produced by B&W, and they discontinued it completely some abount 5 years ago... and now will know nothing of it At least that is the answer I was given at a previous occasion when I asked for some detail about Aura.

But it's a good idea, so I have submitted a question to B&W ... now let's see if they reply.

Thanks a lot - cdl
  Reply With Quote
Old 28th August 2003, 03:22 PM   #12
cdl is offline cdl  Denmark
diyAudio Member
 
Join Date: Aug 2003
Location: Copenhagen
Default Another question...

By the ways, while you are looking at the schem...

Isn't the INA103 in the input doing absolutely nothing for me, as I am driving the amp from a single-ended preamp anyway?

As far as I can see, it just amplifies the signal with a gain between 5 or 10 - which I might just as well do in the gain stage of my DIY preamp (active preamp is needed for this one anyway, input impedance of only 10K). And feed the single ended input directly to the SMT amp module ... that would remove three "useless" opamps from the signal path?

Any opinions?

Cheers, cdl
  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
BOZ bias adjustment help rtate Pass Labs 16 11th July 2008 07:04 PM
Replacing the bias adjustment pot? Original Burnedfingers Solid State 17 8th November 2007 12:31 AM
Yamaha R-3,RX-300 bias adjustment spongebob-2005 Solid State 1 18th November 2006 01:21 PM
KT88 Bias Adjustment batinal Tubes / Valves 7 20th May 2006 05:16 AM


New To Site? Need Help?

All times are GMT. The time now is 09:15 AM.


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