Re: Power supply transformer replacement

Hi Konrad,

Thanks for your reply.
In one of the posts they recommanded you for transformer replacement.
Well, it is not such a big problem for me to do myself. The last few
months I have assembled my high-end amps and DAC completely. Only the
pcb was made for me. This is not to brag or so.

No, it is no ghettoblaster. But because I read another topic where they
spoke about 12-13 VA as te powerconsumption, I thought I would need a
slightly bigger transformer than that. They probably measured this
value including the transformer, which is probably not so efficient.

Those 12 Volts were just wat I measured at the output of the
transformer. I don't know a thing about the requirements of the
circuits inside. Why is it to much and how will a notice a difference?

What kind (manufacturer) of toroidal transformers do you use? I know
Amplimo makes nice ones, but the stock transformers start at 15 VA.

BTW, I already lost my warranty since I made some minor changes
(disconnected the headphone input and some anti-vibration attempts
which just helped a little bit).

Kind regards,

Mischa

DW_PUB1 heeft op vrijdag, 12 mrt 2004 om 13:26 (Europe/Amsterdam) het
volgende geschreven:

> Hi Mischa,
>
> I make such conversions. You don't need a 20 VA transformer (this is
> not a
> Ghetto Blaster ;-)), and 12 V are also too much.
>
> I use a toroidal transformer with 9V and 3,2VA and this is definitely
> enough.
>
> Important thing with a toroidal transformer is that the middle Screw
> may NEVER
> touch the upper and lower part of the metal case of the AT at the same
> time.
>
> If you have any doubts how to do that you should contact me off list.
> I can make
> the change of your AT for EUR 50,00 plus shipping (this includes the
> transformer). Note that you lose your warranty with this change.
>
> Regards Konrad
>
>
> On Fri, 12 Mar 2004 05:56:26 -0500, M. Nieuwboer wrote:
>
> > Thank you for the quick respons. I presume you mean the current
> > indication
> > on the fuse, which was originally 250 mA for 110 V and after
> > switching to
> > 230 V I use a 125 mA. This means a maximum of 28.75 VA can be drawn
> > from
> > the netsupply. But this is the currentpeak allowed by the fuse. When
> > powering on, the transformer will cause a currentpeak which requires
> > a much
> > heavier fuse then you would need based on normal opperation. If I put
> > in a
> > transformer which is to strong, I might blow out the fuse everytime I
> > poweron the AT.
> >
> > If I use a toroidal transformer 230 V of 30 VA, I need a fuse of 160
> > mA,
> > according to the specs of the manufaturer. So that's just a bit more
> > than
> > the current fuse. I guess this would be enough. But I'm not quiet
> > sure.
> >
> > Mischa
> >
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