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From: Mike Rivers on 7 May 2008 07:40
Elvis Kabong wrote:

> So he can't get it rebuilt?

It's not out of the question, but there are probably alternate preamps
he could buy for less than a transformer rewinding job. It's cost
effective to rewind the power transformer for a radio transmitter, but
not a small transformer like what's in the dbx preamp.

As I recall, that's a trick preamp with an IC front end followed by a
toob stage, so it's not directly replaceable with something else, but
given that it was a giveaway anyway, it might be worth the cost of a
replacement transformer if dbx can still provide one. I would think that
should be the first place to look.

--
If you e-mail me and it bounces, use your secret decoder ring and reach
me here:
double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers
(mriv...(a)d-and-d.com)
From: suckerton2 on 7 May 2008 09:32
On May 7, 4:23 am, nos...(a)nospam.com (Don Pearce) wrote:
> On Wed, 7 May 2008 04:16:23 -0500, "Elvis Kabong"
>
> <ampscie...(a)tuneland.com> wrote:
> >Damn! You mean there are no notations of the secondary voltages?
> >Sheeks! What a cheeseball reference! It's almost useless.
>
> >All I did was google the model name and number, found
> >the page, took a look before it completely downloaded and
> >saw that a transformer was on the page so I posted the link.
> >If I had noticed there were no secondary voltage specs,
> >I problably would not have posted the link.
> >What a disappointment.

If it's a Toroid Corp. part they will probably make you one if it is
not a current part. If it is they will refer you to the OEM.
From: Scott Dorsey on 7 May 2008 09:44
matteo <matteo_bonino(a)virgilio.it> wrote:
>Dear all,
> a frend of mine gave me a broken DBX586 preamplifier, to get
>repaired. It has the power transformer out of order, with secondaries
>broken.

What makes you think so? Transformers don't normally fail... if ALL of the
secondaries are open, this is a sign that it has received severe mechanical
abuse.

>The problem is that I can't find the specifications of the transformer
>(output voltage, current), because I can't measure them.
>
>So, I see two solutions:
>1) Is there anyone who has the schematics of the DBX586 preamplifier,
>with transformer output voltages reported ?

dbx will send you one if you call the dbx rep in your country. My guess is
that it uses +/- 15V supplies like everything else with that technology, and
anything providing something in the right ballpark to the 15V regulators will
be fine.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."
From: Arny Krueger on 7 May 2008 10:01
"Scott Dorsey" <kludge(a)panix.com> wrote in message
news:fvsbo0$7ig$1(a)panix2.panix.com
> matteo <matteo_bonino(a)virgilio.it> wrote:
>> Dear all,
>> a frend of mine gave me a broken DBX586 preamplifier,
>> to get repaired. It has the power transformer out of
>> order, with secondaries broken.
>
> What makes you think so? Transformers don't normally
> fail... if ALL of the secondaries are open, this is a
> sign that it has received severe mechanical abuse.
>
>> The problem is that I can't find the specifications of
>> the transformer (output voltage, current), because I
>> can't measure them.
>>
>> So, I see two solutions:
>> 1) Is there anyone who has the schematics of the DBX586
>> preamplifier, with transformer output voltages reported ?
>
> dbx will send you one if you call the dbx rep in your
> country. My guess is that it uses +/- 15V supplies like
> everything else with that technology, and anything
> providing something in the right ballpark to the 15V
> regulators will be fine.

The schematic says that the internal voltages that are more-or-less direct
from the power supply and have their own power transformer windings are -15,
+12, +15, +43, and something up in the 300 volt range for the toobs.

I'm wondering if all the windings are gone, or if only one or two secondary
windings have opened up, allowing for an effective fix based on an added
standard transformer with just one or two standard secondaries.


From: Mike Rivers on 7 May 2008 12:06
Arny Krueger wrote:

> I'm wondering if all the windings are gone, or if only one or two secondary
> windings have opened up, allowing for an effective fix based on an added
> standard transformer with just one or two standard secondaries.

As often, insufficient information. Maybe the primary opened up. Maybe
the transformer is OK and it blew a fuse. Maybe a rectifier blew. But if
he says he needs a new transformer, that's all we can go on.

--
If you e-mail me and it bounces, use your secret decoder ring and reach
me here:
double-m-eleven-double-zero at yahoo -- I'm really Mike Rivers
(mriv...(a)d-and-d.com)
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