Alchemist Kraken APD6A MKII power supply

[darren]

Hi
I am looking for a power supply or at least the ac supply voltage for
an Alchemist Kraken APD6A MKII amp. It belongs to a work mate. It came
in the house he bought. It is set up to run the built in speakers
throughout the house but the Ac supply is missing. I have not found much
information on this amp any any help would be appreciated.

(Trever from .aus.electronics thanks for the link,but it is not stolen)

[Dave Plowman (News)]

In article <PtidndOj_KU78ZbN...@adnap.net.au>,

IIRC, this device uses external transformers? Are the smoothing caps in
the amp or the PS? Are there any caps across the supply lines? You could
make an educated guess from their voltage rating.

--
*Nostalgia isn't what is used to be.

Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.

[Phil Allison]

"darren"

>
> I am looking for a power supply or at least the ac supply voltage for an
> Alchemist Kraken APD6A MKII amp. It belongs to a work mate. It came in the
> house he bought. It is set up to run the built in speakers throughout the
> house but the Ac supply is missing. I have not found much information on
> this amp any any help would be appreciated.

** What is it you actually want ?

A detailed spec for the PSU ?

Do you imagine a suitable AC power supply is available somewhere for you to
buy ?

Not bloody likely.

Somebody is gonna have to BUILD a new supply and that person will need to
have the amplifier in order to do so.


.... Phil

[darren]

Dave Plowman (News) wrote:
> In article <PtidndOj_KU78ZbN...@adnap.net.au>,
> darren <dr...@adam.com.au> wrote:
>> Hi
>> I am looking for a power supply or at least the ac supply voltage for
>> an Alchemist Kraken APD6A MKII amp. It belongs to a work mate. It came
>> in the house he bought. It is set up to run the built in speakers
>> throughout the house but the Ac supply is missing. I have not found much
>> information on this amp any any help would be appreciated.
>
>> (Trever from .aus.electronics thanks for the link,but it is not stolen)
>
> IIRC, this device uses external transformers? Are the smoothing caps in
> the amp or the PS? Are there any caps across the supply lines? You could
> make an educated guess from their voltage rating.
>

The filtering caps and rectifiers are in the amp. the caps are only 35V
so the supply voltage must be below that.
From what I have found out so far the original supply had 2 troidal
transformers in it. I have worked out the pin out of the plug so all I
need is the voltage of the AC supply to put something together. I would
rather not guess if I don't have to but it may come down to that.

Thanks

[darren]

I have put together a supply or two in the past. I know that dose not
put me in the same category as you old wise one but I think I can
workout the details, If not I do know a friendly teck or two, By the way
it is good to see that you give people out side of Australia the same
grief you give people in the aus groups

Thanks

[Dave Plowman (News)]

In article <SOGdnXltf8qccZbN...@adnap.net.au>, darren

It's normal to go for approx twice the RMS voltage for supply caps.
Although I doubt they have in this case.

Do you have any figures for the output of the amp? It should be possible
to guess the supply voltage from that.

--
*On the other hand, you have different fingers*

[Phil Allison]

"darren"

> Phil Allison wrote:
>> "darren"
>>> I am looking for a power supply or at least the ac supply voltage for an
>>> Alchemist Kraken APD6A MKII amp. It belongs to a work mate. It came in
>>> the house he bought. It is set up to run the built in speakers
>>> throughout the house but the Ac supply is missing. I have not found much
>>> information on this amp any any help would be appreciated.
>>
>>
>> ** What is it you actually want ?
>>
>> A detailed spec for the PSU ?
>>
>> Do you imagine a suitable AC power supply is available somewhere for you
>> to buy ?
>>
>> Not bloody likely.
>>
>> Somebody is gonna have to BUILD a new supply and that person will need to
>> have the amplifier in order to do so.
>>
>>

> I have put together a supply or two in the past. I know that dose not put
> me in the same category as you old wise one but I think I can workout the
> details,

** No one, tiny sign of that in sight so far.


> If no I do know a friendly teck or two,

** The word is " tech " - short for technician.

> By the way it is good to see that you give people out side of Australia
> the same grief you give people in the aus groups

** Is that an attempt at sarcasm ?



.... Phil

[darren]

The amp is rated at 55w rms into 8 ohms
http://www.superfi.co.uk/P-4309-discontinued-alchemist-kraken-integrated-amplifier-apd6a-mkii.aspx

One of the sites I found put the peak demand of the amp at 160W.

[darren]

Just a statement of fact. Don't think I need to play any longer, Best
not to over excite the resident grump! You do seem to normally know
what is what in the electronics field, your language and attitude is a
little predictable though.


By By
>
>
> .... Phil
>
>
>
>

[Jim Lesurf]

In article <52b337f...@davenoise.co.uk>, Dave Plowman (News)

<da...@davenoise.co.uk> wrote:
> In article <PtidndOj_KU78ZbN...@adnap.net.au>, darren
> <dr...@adam.com.au> wrote:
> > Hi I am looking for a power supply or at least the ac supply voltage
> > for an Alchemist Kraken APD6A MKII amp. It belongs to a work mate. It
> > came in the house he bought. It is set up to run the built in
> > speakers throughout the house but the Ac supply is missing. I have
> > not found much information on this amp any any help would be
> > appreciated.

> > (Trever from .aus.electronics thanks for the link,but it is not
> > stolen)

> IIRC, this device uses external transformers?

I think it uses/used an external PSU, but with some added complications.
The 'basic' PSU only having one transformer, but you could have a second so
using one per channel. But I have no diagrams or data on the designs. Just
a few leaflets and photos. So I can't help.

I have an unreliable recollection that its performance measured poorly in
some ways. My impression is that the PSU was too weedy. But I can't recall
details, so this is just vague memory.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

[Jim Lesurf]

In article <SOGdnXltf8qccZbN...@adnap.net.au>, darren
<dr...@adam.com.au> wrote:

> >

> The filtering caps and rectifiers are in the amp. the caps are only 35V
> so the supply voltage must be below that. From what I have found out
> so far the original supply had 2 troidal transformers in it. I have
> worked out the pin out of the plug so all I need is the voltage of the
> AC supply to put something together. I would rather not guess if I
> don't have to but it may come down to that.

If you can't find *any* info beyond the cap voltage rating and the output
power rating you can try using a bench PSU to feed the rectifiers. Use this
with a cautiously low dc voltage at first (and a current limit that is
small to start with). Then experiment with voltages that are higher until
you can approximate the rated output power.

It is a gamble, so only if there is no simple alternative, but the designer
probably started off with a bench supply as you can have it current limit
and run at low voltage when starting off testing.

[Dave Plowman (News)]

In article <52b34eb...@audiomisc.co.uk>,

Jim Lesurf <no...@audiomisc.co.uk> wrote:
> If you can't find *any* info beyond the cap voltage rating and the
> output power rating you can try using a bench PSU to feed the
> rectifiers. Use this with a cautiously low dc voltage at first (and a
> current limit that is small to start with). Then experiment with
> voltages that are higher until you can approximate the rated output
> power.

Have you looked at the price of a decent twin rail PS that goes to 50
volts or so at a couple of amps?

> It is a gamble, so only if there is no simple alternative, but the
> designer probably started off with a bench supply as you can have it
> current limit and run at low voltage when starting off testing.

Not started with a power output in mind?

--
*"I am " is reportedly the shortest sentence in the English language. *

[Trevor Wilson]

**You're welcome and it is spelt Trevor. Did you try to locate the old
Australian distributor?

--
Trevor Wilson www.rageaudio.com.au

[Trevor Wilson]

**Which, just to remind you, is Synergy Audio Visual in Victoria. You
should contact someone in the service and/or spare parts department.
Explain your situation. A tech who has worked on the equipment should be
able to assist. Alternatively, you should hand the job over to someone
with more experience.


--
Trevor Wilson www.rageaudio.com.au

[Trevor Wilson]

On 7/23/2012 3:39 AM, Dave Plowman (News) wrote:
> In article <52b34eb...@audiomisc.co.uk>,
> Jim Lesurf <no...@audiomisc.co.uk> wrote:
>> If you can't find *any* info beyond the cap voltage rating and the
>> output power rating you can try using a bench PSU to feed the
>> rectifiers. Use this with a cautiously low dc voltage at first (and a
>> current limit that is small to start with). Then experiment with
>> voltages that are higher until you can approximate the rated output
>> power.
>
> Have you looked at the price of a decent twin rail PS that goes to 50
> volts or so at a couple of amps?

**That's what a (say) 70 VRMS, centre tapped 5 Amp transformer, a 35 Amp
bridge, a couple of 10,000uF 63 Volt electros, driven by a variable
autotransformer (aka: Variac�) is for. I thought everyone had one on the
bench. Mine is at least 3 decades old and does the job nicely. No fancy
current limiters, but rail fuses can be dropped to 200ma easy enough.
Digital meters are so cheap, that one on each rail alerts one to
potential problems pretty quickly.



--
Trevor Wilson www.rageaudio.com.au

[Dave Plowman (News)]

In article <a745eu...@mid.individual.net>,

Trevor Wilson <tre...@SPAMBLOCKrageaudio.com.au> wrote:
> **That's what a (say) 70 VRMS, centre tapped 5 Amp transformer, a 35 Amp
> bridge, a couple of 10,000uF 63 Volt electros, driven by a variable

> autotransformer (aka: Variac�) is for.

And that lot will cost?

My guess is anyone who already possessed such a setup wouldn't be asking
the question in the subject.

--
*Did you ever notice when you blow in a dog's face he gets mad at you? *

[darren]

Yes, They have not got back to me yet so I thought I would try here
before trying again. Sorry Spelling is not my strong point.

Daren

[Jim Lesurf]

In article <52b3606...@davenoise.co.uk>, Dave Plowman (News)

<da...@davenoise.co.uk> wrote:
> In article <52b34eb...@audiomisc.co.uk>, Jim Lesurf
> <no...@audiomisc.co.uk> wrote:
> > If you can't find *any* info beyond the cap voltage rating and the
> > output power rating you can try using a bench PSU to feed the
> > rectifiers. Use this with a cautiously low dc voltage at first (and a
> > current limit that is small to start with). Then experiment with
> > voltages that are higher until you can approximate the rated output
> > power.

> Have you looked at the price of a decent twin rail PS that goes to 50
> volts or so at a couple of amps?

Not since I bought one some years ago. :-)

> > It is a gamble, so only if there is no simple alternative, but the
> > designer probably started off with a bench supply as you can have it
> > current limit and run at low voltage when starting off testing.

> Not started with a power output in mind?

FWIW when I've done tests like this I tend to start off with the bench PSU
current limited to just be well clear of the required bias. Then wind it up
a little as I try using the amp. The idea being to try and avoid problems
during initial tests and hope to limit "Ooops!" consequences. :-)

In this case, though, I think it is a high-biased design (claimes to be
class A) so you probably need to start off with a fair current before
applying any signal into an output load.

[Trevor Wilson]

On 7/23/2012 7:58 PM, Dave Plowman (News) wrote:
> In article <a745eu...@mid.individual.net>,
> Trevor Wilson <tre...@SPAMBLOCKrageaudio.com.au> wrote:
>> **That's what a (say) 70 VRMS, centre tapped 5 Amp transformer, a 35 Amp
>> bridge, a couple of 10,000uF 63 Volt electros, driven by a variable

>> autotransformer (aka: Variac�) is for.

>
> And that lot will cost?

**Nothing. Built from stuff lying around. Just to remind you: I was
specifically referring to the comment about the high cost of a variable,
high current, regulated, split rail power supply. A Variac� is cheap
(because most techs already have at least one kicking around).

>
> My guess is anyone who already possessed such a setup wouldn't be asking
> the question in the subject.
>

**Which is precisely why the OP should hand the job to someone who knows
his/her business.


--
Trevor Wilson www.rageaudio.com.au

[Trevor Wilson]

**You should 'PHONE them. If you email, they will simply put it in the
'too hard' basket and you will never get anywhere.

--
Trevor Wilson www.rageaudio.com.au