Any diff if in F3: Plitron vs. Avel Lindberg? - Page 2 - diyAudio
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Old 25th November 2008, 01:43 AM   #11
Telstar is offline Telstar  Italy
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Quote:
Originally posted by spzzzzkt
I'm using trafo's wound by Harbuch on chunky Antrim cores in my A30. Nice and quite until someone is using an device that messes with the AC - hair dryers and electric heaters are culprits. Antrim were pretty popular in the UK hifi industry for a long time so should be a good quality alternative.

http://www.antrimtransformers.com/
This is the problem; it shouldnt.

I have a simple AC filter on top of my ac distributor and never experienced such issues with any SS amplifier that I have used.

Or is the F3 as sensitive to power as a 300B SET?
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Old 25th November 2008, 02:09 AM   #12
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Have you actually found any trafo that isn't effected by perbutations on the powerlines?

The obvious answer is to filter as you have done. The filtering is going to remove any junk on the power lines before it hits the trafo so you wouldn't expect any buzzing.
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Old 25th November 2008, 04:16 AM   #13
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All of my toroids hate my fridge, I am adding a filter to my list of future projects. Has any one potted the center of their toroid transformer (like Plytron) I would think it may quite them down a little.

Bill
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Old 25th November 2008, 04:23 AM   #14
ssmith is offline ssmith  France
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I have plitrons and had some buzzing -- added these DC filters from Per-Anders and problem was sorted.
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Old 25th November 2008, 10:13 AM   #15
Magura is offline Magura  Denmark
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Quote:
Originally posted by Telstar



Pls drop me an email.

Tnx.

How about you either turn on your email then, or simply drop me a mail?


Magura
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Old 25th November 2008, 11:38 AM   #16
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Quote:
Originally posted by ssmith
I have plitrons and had some buzzing -- added these DC filters from Per-Anders and problem was sorted.
Hello ssmith

This is happening also to my custom Toroid´s. Could you please clarify "sorted". Do you mean "completely solved"?

Sorry, I´m not native in English.

Are these DC Traps rated for high (10A) current?

Thanks and best regards
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Old 25th November 2008, 11:52 AM   #17
ssmith is offline ssmith  France
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Originally posted by JC Fardo


Hello ssmith

This is happening also to my custom Toroid´s. Could you please clarify "sorted". Do you mean "completely solved"?

Sorry, I´m not native in English.

Are these DC Traps rated for high (10A) current?

Thanks and best regards
The problem I had is that there is DC on the mains -- which I discovered here is a cause of buzzing transformers. The buzzing got worse when I switched on ceiling fans.

Rather than reinvent the wheel, I opted for Per-Anders' PCBs (although the circuit is so simple it can easily be made point-to-point), and yes, that fixed the problem. No more buzzing.

For the maximum continuous current of this circuit, it depends what capacitors you use. I suggest you send a mail to Per Anders for further details -- I'm not an expert. I wouldn;t hesitate to recommend his PCB's by the way -- they are very nice quality.
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Old 25th November 2008, 12:20 PM   #18
Telstar is offline Telstar  Italy
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Quote:
Originally posted by Magura


How about you either turn on your email then, or simply drop me a mail?

Magura
Ops! I thought it was visible!
Email sent
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Old 25th November 2008, 12:52 PM   #19
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Quote:
Originally posted by ssmith


The problem I had is that there is DC on the mains --..., I opted for Per-Anders' PCBs ...I wouldn;t hesitate to recommend his PCB's by the way -- ...they are very nice quality.
Great, thanks
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Old 25th November 2008, 08:30 PM   #20
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I'm sure there are better resources for dc blockers but this is an ok starting point:

http://diyparadise.com/dablok.html
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