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

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 13th September 2017, 08:18 PM
moley moley is offline
Join Date: Nov 2014
Location: Sheffield
Posts: 30
Default Re: WD Phono 3 - DC on Output?

Thanks that's fantastic.

Strange thing is, when I looked in my parts bin to see if I had a 450v 100uf caps as per the Phono 3S schematic I found two and suddenly remembered these were left over after I had built the kit originally (Phono 3 XL).

I have ordered some 3 watt 1k resistors and will fit these with the caps as per the schematic. Would metal oxide be preferred here?

I just did a quick test with a 5.6K ohm dummy load and the power spike only registers at 2 volts DC when the PSU3 is switched on. Moving the scale down to mV range I am now measuring at -5 to 7 mV DC. The corner frequency calculates as 12.92Hz with this load and 2.2UF caps currently in place.

Will carry out more tests when the resistors arrive and will also try valve swapping. I did find some cheap 0.22UF and 0.1UF poly caps in my spares bin so can try these in place of the 2.2UF clarity caps also.

Last edited by moley; 13th September 2017 at 08:25 PM. Reason: more detail
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 04:42 AM.

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