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DC blocker on F6
DC blocker on F6
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Old 10th September 2017, 09:41 AM   #1
ColinA123 is offline ColinA123  United Kingdom
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Default DC blocker on F6

Placed here because used on F6 clone.
Since building, the transformer on my F6 has made slight mechanical noise. This is not audible on the speakers.
It made a low level hum, but when other items like the network server were switched on there was a "boing" sound for a few seconds.

I fitted a DC blocker recently (simple cap and rectifier design.)
Just isolating the amp.
This has removed the mechanical noise, and the boing.

It may be psychological but the amp now sounds cleaner and even better.

Anyway may help someone else.
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Old 10th September 2017, 03:56 PM   #2
vdi_nenna is offline vdi_nenna  United States
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DC blocker on F6
I'm pretty sure the "boing" is mechanical noise due to current change either incoming on the amp at turn on or something else on the ac line draining current. Injection of dc current to the AC line will cause hum in toroids. I read this starts to happen on toroid 600va and larger.

I have a 2k VA balanced power unit that needed such a dc filter. Still have some noise when things connected to it are powered on.

Any reduction of the noise floor will give an improvement.
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Old 10th September 2017, 07:17 PM   #3
fabrice63 is offline fabrice63  France
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Have you tried to mesure accurately the dc online , instead of blocking some hypothetycal dc

remember that the best is made by the less


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Old 10th September 2017, 07:22 PM   #4
peranders is offline peranders  Sweden
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DC blocker on F6
It's very hard to measure the DC voltage with simple means.
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Old 12th September 2017, 02:58 AM   #5
Bare is offline Bare  Canada
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Quote:
Originally Posted by ColinA123 View Post
Placed here because used on F6 clone.
Since building, the transformer on my F6 has made slight mechanical noise. This is not audible on the speakers.
It made a low level hum, but when other items like the network server were switched on there was a "boing" sound for a few seconds.

I fitted a DC blocker recently (simple cap and rectifier design.)
Just isolating the amp.
This has removed the mechanical noise, and the boing.

It may be psychological but the amp now sounds cleaner and even better.

Anyway may help someone else.
Really!? Mine is ~1 year old it makes ZERO noises... from v first power up I had to check and see IF had actually powered the thing up as I placed my ear as close to the dustcaps of my Tannoy Golds as possible.. and there were Zero sounds/Nothing at all.. regardless of the setting on the Volume control.
Total DEAD silence.. astounding! after decades of crappy predecessor Amps
I can only assume that ; either there are inferior parts fitted
OR your utility supplier is feeding ''dirty' power.
Most utilities Will come and evaluate their product as delivered into your location.. gladly.
Best avail yourself of this basic service?
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Old 12th September 2017, 11:41 AM   #6
vdi_nenna is offline vdi_nenna  United States
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DC blocker on F6
https://pooraudiophile.com/2015/03/h...ansformer.html
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Old 12th September 2017, 12:00 PM   #7
Bas Horneman is offline Bas Horneman  Netherlands
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I always use a DC blocker for my projects.

Quote:
Most utilities Will come and evaluate their product as delivered into your location.. gladly.
Not in the Netherlands. They'll laugh at you I imagine.
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Old 12th September 2017, 12:40 PM   #8
Dennis Hui is offline Dennis Hui  Canada
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DC blocker on F6
Hi Vince,

The Emotiva looks very interesting. Thanks for the link.

Cheers,
Dennis
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Old 12th September 2017, 04:27 PM   #9
mlloyd1 is offline mlloyd1  United States
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DC blocker on F6
thanks for the link.
it even has a big internals photo.
i'm surprised i could NOT see any BIG electrolytics, although i did see evidence of the presence of big bridge rectifiers.
lots of rf filter stuff, though.

mlloyd1


Last edited by mlloyd1; 12th September 2017 at 04:36 PM.
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Old 12th September 2017, 05:17 PM   #10
mlloyd1 is offline mlloyd1  United States
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DC blocker on F6
well, digging around a bit, i saw another forum where someone claimed to have seen a schematic and gave info that suggested the existence of 4700uF caps in there somewhere ...

mlloyd1
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