World-Designs-Forum  

Go Back   World-Designs-Forum > World Designs > Problems
Register FAQ Members List Calendar Gallery Today's Posts Mark Forums Read

Problems For questions and answers re World Designs Projects

Reply
 
Thread Tools Display Modes
  #31  
Old 12th December 2020, 07:31 AM
bob orbell bob orbell is offline
Senior Member
 
Join Date: Nov 2009
Location: kettering northants.
Posts: 2,255
Default Re: 5U4G substitution

Reading all this with interest, but this is a forum and a modification, as has been mentioned, most do and will respect HV valve equipment, with regard to Matthew, he does not sell this amp. as a kit with the modification in question as a product, so should not be responsible for any issues arising, but as Greg has said, a warning in the FAQ should be added. Bob
Reply With Quote
  #32  
Old 12th December 2020, 08:49 AM
snowman_al snowman_al is offline
Member
 
Join Date: Nov 2016
Location: West Wales
Posts: 77
Default Re: 5U4G substitution

Richard, all,
I agree the modification is excellent. I see it as well implemented and a genuine cost saving.

I would hope that anyone who undertakes it has a good understanding of the risks it introduces, but from experience know some DIYs just follow the plans and pictures and have no understanding of how it works. And therefore are oblivious to the possible risks. As would 3rd parties be.

It just seemed sensible to point out in the instructions that there are / will be high voltages above the chassis following the mod. And warn them what not to do and why. That informs the people who do not know and reminds those who do. That was my suggestion in post #19...


No one 'deserves' to get a 400+ volt ‘belt’. It hurts and can leave a serious burn or worse. Alan
Reply With Quote
  #33  
Old 12th December 2020, 11:51 AM
Richard Richard is offline
Super Moderator
 
Join Date: Dec 2005
Location: Notts
Posts: 5,091
Default Re: 5U4G substitution

Quote:
Originally Posted by snowman_al View Post
Richard, all,
I agree the modification is excellent. I see it as well implemented and a genuine cost saving.

I would hope that anyone who undertakes it has a good understanding of the risks it introduces, but from experience know some DIYs just follow the plans and pictures and have no understanding of how it works. And therefore are oblivious to the possible risks. As would 3rd parties be.

It just seemed sensible to point out in the instructions that there are / will be high voltages above the chassis following the mod. And warn them what not to do and why. That informs the people who do not know and reminds those who do. That was my suggestion in post #19...


No one 'deserves' to get a 400+ volt ‘belt’. It hurts and can leave a serious burn or worse. Alan

Thanks Alan, I agree completely and have added a Safety Notice at the start of the article. Perhaps you and others familiar with these valves will take a look and suggest anything I've missed. I've tried to be relevant to these particular valves rather than cover all the dangers of our hobby. Thanks also for the updated circuit. I've also added voltages so a builder can see what's on the connectors
Reply With Quote
  #34  
Old 12th December 2020, 12:07 PM
Richard Richard is offline
Super Moderator
 
Join Date: Dec 2005
Location: Notts
Posts: 5,091
Default Re: 5U4G substitution

Updated article,

http://www.world-designs.co.uk/forum...ead.php?t=7971

Updated circuit,

http://www.world-designs.co.uk/forum...3&d=1607772909
Reply With Quote
  #35  
Old 12th December 2020, 10:15 PM
colin.hepburn colin.hepburn is online now
Super Moderator
 
Join Date: Jan 2006
Location: Newtonhill Aberdeenshire
Posts: 2,595
Default Re: 5U4G substitution

Hi all
Yep, when I did the 6D22S upgrade in my JE. Labs single-ended Amp I was also talked through it by our Dr. John Caswell and Richard thank guys it’s the same circuit like the one described here. but using an RC. CL.CL.RC.filter supply. And I Can say with confidence it's reliably as well I've never had any fails with these I remember buying a stash of 12 valves at the time as backups and I am still using the first pair I fitted in the amp today. some 7/8 years later a recommended upgrade for all the amp suggested here'

The only error I made at the time was to use the top Cap for the 807valve which were to lose and needed the contact nipped up but these were replaced with the correct sized ¼ inch type here’s a link for the top cap I have
https://www.ebay.co.uk/itm/10X-1-4-g....c100227.m3827
__________________
The Blues man

Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s
Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2


If you have trouble reading my posts its because I am a dyslexic member

Last edited by colin.hepburn; 12th December 2020 at 10:26 PM. Reason: my Spelling again
Reply With Quote
Reply

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 05:12 PM.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright World Designs