It may be a can of worm , if not handled properly.

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

In Reply to: switching psu for heaters posted by Grey Scale on April 26, 2007 at 08:27:26:

Hi.
The EMI/RFI noies emiitted by the switch mode power supply (SMPS), riding on the DC which powers the heaters, can go into the tube preamp signal paths via the heater-cathode inter-electrode capacitance.
That's why I've seen even Hi-end brandname SMPS add a RF ferrous suppressor ring moded on to the O/P DC cord.
Here what I have done:-
The heaters of my phonostage is powered by PURE DC from 6AH sealed lead acid cell, charged by a SMPS. I custom built it so that when the phonostage is being powered by the SLA cell, the SMPS is swithced off & TOTALLY electrically detached from the pre-amp.
So the risk of RF rash, even via teh chassis grounding, is eliminated.
c-J

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Follow Ups Full Thread

Topic - switching psu for heaters - Grey Scale 08:27:26 04/26/07 (2)

It may be a can of worm , if not handled properly. - cheap-Jack 08:49:46 04/26/07 (1)

Re: It may be a can of worm , if not handled properly. - Grey Scale 01:27:47 04/27/07 (0)

Follow Ups

It may be a can of worm , if not handled properly. - cheap-Jack 08:49:46 04/26/07 (1)

Re: It may be a can of worm , if not handled properly. - Grey Scale 01:27:47 04/27/07 (0)

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