In article , darren
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.

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/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

In article ,
Jim Lesurf 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. *

Dave Plowman London SW
To e-mail, change noise into sound.

On 7/22/2012 12:59 PM, darren 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)

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

--
Trevor Wilson www.rageaudio.com.au

On 7/23/2012 7:01 AM, Trevor Wilson wrote:
On 7/22/2012 12:59 PM, darren 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)

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

**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

On 7/23/2012 3:39 AM, Dave Plowman (News) wrote:
In article ,
Jim Lesurf 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

In article , Dave Plowman (News)
wrote:
In article , Jim Lesurf
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.

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/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

In article ,
Trevor Wilson 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? *

Dave Plowman London SW
To e-mail, change noise into sound.

Trevor Wilson wrote:
On 7/22/2012 12:59 PM, darren 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)

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

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

On 7/23/2012 7:58 PM, Dave Plowman (News) wrote:
In article ,
Trevor Wilson 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

On 7/23/2012 8:10 PM, darren wrote:
Trevor Wilson wrote:
On 7/22/2012 12:59 PM, darren 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)

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

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

**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