Wharfedale Linton amp, shut down problems. - 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 16th November 2014, 04:15 PM   #1
diyAudio Member
 
Join Date: Nov 2014
Default Wharfedale Linton amp, shut down problems.

Apparently its a leak delta 70 in disguise.
Anyhow, when I shut it down it sounds like a sipper being undone, it starts as a low tone then gets high pitched before fading out, this is only in the left channel, there is a bit of a thud from the right but its not really too bad.
The thing has been in an attic for many years.

The problem happens on all source selections and is not volume dependant.

When working it seems to work fine, Just this noise as soon as I switch it off.

Any ideas?

The manual for the Leak Delta 70 is here in HIFIEngine. I have read that the leak and wharfedale amps are identical.

Login - HiFi Engine
  Reply With Quote
Old 16th November 2014, 04:26 PM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
First things that come to mind are dried out electrolytic caps. Something of this age should really be rebuilt with new replacements.

Thuds and noises on switch on and switch off are "normal" with any capacitor coupled amp that doesn't employ a dedicated relay to give a speaker delay when powering up.

So I suspect yours is a little worse than normal given the age and probability of cap issues, but you will probably never get it silent.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 16th November 2014, 04:30 PM   #3
diyAudio Member
 
Join Date: Nov 2014
So pulling the power and pre boards and rebuilding with new caps might sort the problem?
Would these old amps use film caps?
  Reply With Quote
Old 16th November 2014, 04:52 PM   #4
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally Posted by wharfedalelinton View Post
So pulling the power and pre boards and rebuilding with new caps might sort the problem?
Would these old amps use film caps?
No, they use electrolytics - but the larger ones aren't fitted on the boards.

As it's only on the left channel, try swapping the left and right boards over, and confirm the fault swaps channels (proving if it's on the board or no).
__________________
Nigel Goodwin
  Reply With Quote
Old 16th November 2014, 04:59 PM   #5
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Film caps if used would tend to be small values. You would need to look and make a quick evaluation of what is fitted. I'm guessing these are all "axial" caps where a lead comes from each end of the cap rather than more modern radials which have both leads together at the same end of the cap. It no big deal, just check physical sizes of things before ordering, modern caps will be tiny in comparison. Axials are still available but tend to be dearer and available in limited values and ratings.

The fact the volume control has no effect means the problem is specific to that one channels power amplifier.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 16th November 2014, 05:04 PM   #6
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Click the image to open in full size.
This might be quicker for reference as the above link needs amendment. It comes by way of Paul Kemble's excellent site for vintage UK audio reference.
A Paul Kemble web page - index to 'sound' webpages.
__________________
Ian
  Reply With Quote
Old 16th November 2014, 05:10 PM   #7
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Its one of those links
Attached Images
File Type: png Capture.png (500.1 KB, 72 views)
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 16th November 2014, 05:36 PM   #8
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Hmm...you mean my link Mooly? Perhaps that part of of the spam doesn't travel to Oz as I can log in on another PC also, without getting that sort of message but of course, Angelfire is a massive spam generator - I guess they keep only the best for the the home crowd!
This link should divert people to the registration process which may be needed at Hifiengine. Apolgies to any who suffered that link's problems.
Leak Stereo 70 Manual - Stereo Integrated Amplifier - HiFi Engine
__________________
Ian
  Reply With Quote
Old 16th November 2014, 06:34 PM   #9
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by Ian Finch View Post
Hmm...you mean my link Mooly?
Err... yes lol Picture hosting and file sharing sites have the same problem. I always use task manager to close IE if anything like pops ups.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 16th November 2014, 06:41 PM   #10
diyAudio Member
 
Join Date: Nov 2014
That's very odd guys, I switched the two power amp boards, left to right and right to left and the problem is now gone, all I have now is a noisy volume/power switch.
I wonder if it was dirty contacts on the board or the socket it locates into?

Anyhow, I did notice the power on bulb was hunting slightly however this also seems to have got better with a few on and off cycles, I wonder if the thing just needs a good clean?

What do you guys recommend to clean and lubricate dirty old pots and switches?
  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
Odd Wharfedale Linton XP2 (variation?) Crossover Help Phase700B Multi-Way 4 16th February 2014 11:23 PM
wharfedale pm 600 problems findingemo Solid State 1 25th March 2012 07:53 PM
FS wharfedale linton 3 vintage speakers v4lve lover Swap Meet 1 22nd September 2011 02:17 PM
Wharfedale Linton 3XP speaker wiring guitarman1 Parts 4 15th October 2008 06:49 AM
PE Bash 500 Amps shut down problems? crippledchicken Subwoofers 2 6th August 2007 12:29 PM


New To Site? Need Help?

All times are GMT. The time now is 04:40 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2