Go Back   World-Designs-Forum > World Designs > WD Other Parts and Projects
Register FAQ Members List Calendar Gallery Today's Posts Mark Forums Read

WD Other Parts and Projects All other WD Parts and Projects

Thread Tools Display Modes
Old 17th May 2022, 01:38 AM
Pingushome Pingushome is offline
Senior Member
Join Date: Feb 2006
Location: Wales
Posts: 172
Default WD/WAD HD83 Mk2

Hi ,
So after the kind help from snowman al and Bob, thanks to you both, the Maplin mains filter being built and Iíve now got the bug again!
I was thinking my hd83 could do with a brush up. Thereís a very small in balance between channels and a slight russell when music is very quiet. Neither is enough to need a checkout really but I inherited it form a friend and itís getting a bit long in the tooth now I think.
So I was thinking new caps/better, bigger psu caps, different diodes, and some Mills resistors for the bigger ones, check replace other resistors. Probably a pair of new valves too.
Or should I just go for the XL upgrade from Matthew?
Alternately I could go for the 3S pcb and upgrade it to a 3S. That was on the cards a while ago but then didnít think, and still donít think, Iíd need the impedance matching anyway.
Iíd be interested to know what others have done to their amps and the results. Any suggestions or thoughts on parts, makes, values would be gratefully received
Reply With Quote
Old 17th May 2022, 11:48 PM
BOONDI's Avatar
BOONDI BOONDI is offline
Senior Member
Join Date: Jan 2006
Location: Dundee, Scotland.
Posts: 1,063
Default Re: WD/WAD HD83 Mk2

Itchy fingers.....

A good upgrade to psu caps is to simply replace with higher voltage lower esr. I used 450v rubicons. Also coupling caps replaced with high quality polypropylene types of same value. As for resistors, you could try foils in the signal paths. As for valves, Watford valves have stumbled onto a limited stock of Amprex Ecl83's but they cost a bit more than the mullard types. For the diodes, some on here will no doubt have recommendations for their own particular silent ultra fast super dooper favourites.....
Who am I? Just another concerned citizen....

Reply With Quote
Old 18th May 2022, 06:58 AM
bob orbell bob orbell is offline
Senior Member
Join Date: Nov 2009
Location: kettering northants.
Posts: 2,369
Default Re: WD/WAD HD83 Mk2

Agree with Boondi on the power supply, Nichicon do some very good, very low ESR capacitors with which you can hear the change, they also do some very high price ones, Nick Lucas has then at Hi-Fi Collective, make sure you are sitting down though when you look at the price. Wima MKP10 coupling capacitors are also very good. Bob
Reply With Quote

Thread Tools
Display Modes

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
Forum Jump

All times are GMT +1. The time now is 07:41 AM.

Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright World Designs