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Old 13th September 2017, 08:18 PM
moley moley is offline
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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
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