Pearl Two - Page 101 - 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 6th November 2011, 05:08 PM   #1001
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
Quote:
Originally Posted by richluvsound View Post
How critical is the Wattage or VA ? ...... Am I creating too many problems
using this .... ?

MULTICOMP|MCFE050/25|TRANSFORMER, 50VA, 2 X 25V | Farnell United Kingdom


or this .... BLOCK|RK40/22|TRANSFORMER, 40VA, 2 X 22V | Farnell United Kingdom
Also available from these guys for a couple of quid less.They seem to be tied in with Farnell so don't get the price difference. Farnell are good and quick though having been woken up at 7.30 in the morning by there delivery people even when some items have had to come from one of there european sites.

MULTICOMP|MCFE050/25|TRANSFORMER ENCAPS. 50VA 2X25V | CPC
  Reply With Quote
Old 6th November 2011, 06:40 PM   #1002
diyAudio Member
 
jacco vermeulen's Avatar
 
Join Date: Oct 2004
Location: At the sea front, Rotterdam or Curaçao
Send a message via Yahoo to jacco vermeulen
Mr Cheapo : DAGNALL ELECTRONICS|D3620.|TRANSFORMER, 6VA 2X 24V | Farnell United Kingdom
__________________
The buck stops Here
  Reply With Quote
Old 6th November 2011, 07:42 PM   #1003
diyAudio Member
 
richluvsound's Avatar
 
Join Date: Sep 2010
Location: LONDON
that should look wonderful with silver wire surrounded by mundorf M-lytic caps ......

I think I'll just leave this thread for the chosen ones.... sorry for wasting your time !
  Reply With Quote
Old 9th November 2011, 11:46 PM   #1004
diyAudio Member
 
richluvsound's Avatar
 
Join Date: Sep 2010
Location: LONDON
Default Pearl Problem ?

Gents ,

So , now I need some of the genius lurking . I have a problem with one of the boards . I keep blowing fuses .

Voltage from PSU is solid and stable @ 40.2 VDC on both + & - . There was
little smell when I first turned it on . The LED dimmed never to return .
The fuse is 250mA . I have had the working board running for about 3 hours with no problems . I have taken photos , visual inspection proved sound . Solder joints are solid with no shorts .
Short of dismantling the board are there any suggestions on how I may find the fault . ?

thank you , Rich
  Reply With Quote
Old 10th November 2011, 02:29 AM   #1005
diyAudio Member
 
richluvsound's Avatar
 
Join Date: Sep 2010
Location: LONDON
Ok ..... it would help if I didn't have the + and - the wrong way round . At least that explains the 8 fuses in the bin !


Now I have nothing , but distortion and the occasional pop .... Test speakers at low volume . Its the same out of both channels .... ????? any ideas guys ?

Cheers , Rich
  Reply With Quote
Old 10th November 2011, 04:05 AM   #1006
nar is offline nar
diyAudio Member
 
nar's Avatar
 
Join Date: Apr 2002
Location: near the sea
At least, you should change the on-board regulators and the led for new ones

If no improvement, go on with the bipolars replacement ... at least I hope the precious jfet are still alive, but maybe not.

You could also have fried some resistors. Your mileage may vary.

Best,

nAr
__________________
"... Audio needs the thinnest wire ..." Rowan McCombe ... I hear it !!!
"Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright Allen was right ...

Last edited by nar; 10th November 2011 at 04:08 AM.
  Reply With Quote
Old 10th November 2011, 04:07 AM   #1007
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
Rich build yourself a light bulb tester if you havent already done so it saves a fortune in blown fuses and generally stops anything from cooking. Won't tell you where the problem is but lets you know there is a problem before damage is done.
  Reply With Quote
Old 10th November 2011, 04:12 AM   #1008
nar is offline nar
diyAudio Member
 
nar's Avatar
 
Join Date: Apr 2002
Location: near the sea
Quote:
Originally Posted by Marra View Post
Won't tell you where the problem is but lets you know there is a problem before damage is done.
Yes, but in his case it's better to know where the problem is

Bulb would be for another time ... good idea
__________________
"... Audio needs the thinnest wire ..." Rowan McCombe ... I hear it !!!
"Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright Allen was right ...
  Reply With Quote
Old 10th November 2011, 09:51 AM   #1009
diyAudio Member
 
richluvsound's Avatar
 
Join Date: Sep 2010
Location: LONDON
Thanks Gents ,

I'll change the regs out to start with ... !


cheers, Rich
  Reply With Quote
Old 10th November 2011, 01:44 PM   #1010
diyAudio Member
 
richluvsound's Avatar
 
Join Date: Sep 2010
Location: LONDON
Do I need to change regs on both boards or just the one blowing the fuse ... ?

I changed the ones on the bad board and no change - still got the same distortion .... I have just ordered new caps 22uf and 3300uf ... I'll call pass this afternoon and order new j fets.

Rich
  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
Another diy-pearl... lykkedk Pass Labs 18 15th June 2007 04:44 PM
ono or pearl PCB's mantisory Pass Labs 1 28th September 2006 11:12 PM
Pearl need help dzkh63 Pass Labs 1 26th September 2006 03:16 PM
WTB: Pearl PCB aire Pass Labs 1 26th February 2006 10:51 AM


New To Site? Need Help?

All times are GMT. The time now is 02:47 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