Clearly in need of something to do - I bought one of those power/volt
etc measurement thingies and came up with this:

Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob

Rob wrote:
The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob

Power supply reservoir capacitors charging up.

--
Adrian C

Adrian C wrote:

Rob wrote:

The curious thing about the SS amp is that it starts at about 63W,
then seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob


Power supply reservoir capacitors charging up.


That should take about 1 cycle (ok, maybe 1 and a little bit), but still
only 20ms or so.

Unless the power supply caps needed to reform at startup.

--
Nick

On Tue, 25 Apr 2006 23:51:51 +0100, Adrian C
wrote:

Rob wrote:
The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob

Power supply reservoir capacitors charging up.

No, that takes less than a second. The effect noted is output stage
bias change as the amplifier warms up.

--

Stewart Pinkerton | Music is Art - Audio is Engineering

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Stewart Pinkerton wrote:
On Tue, 25 Apr 2006 23:51:51 +0100, Adrian C
wrote:

Rob wrote:
The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob
Power supply reservoir capacitors charging up.

No, that takes less than a second. The effect noted is output stage
bias change as the amplifier warms up.

OK. I stand corrected. :-)

--
Adrian C

On Tue, 25 Apr 2006 23:51:51 +0100, Adrian C
wrote:

Power supply reservoir capacitors charging up.

For two minutes?

On Tue, 25 Apr 2006 23:51:51 +0100, Adrian C
wrote:

Power supply reservoir capacitors charging up.

and for two minutes @ 40 watts?

Laurence Payne wrote:
On Tue, 25 Apr 2006 23:51:51 +0100, Adrian C
wrote:

Power supply reservoir capacitors charging up.

and for two minutes @ 40 watts?

OK, OK, I woz wrong ;-)

Got spanked three days ago for this...

--
Adrian C

Laurence Payne wrote:
On Tue, 25 Apr 2006 23:51:51 +0100, Adrian C
wrote:


Power supply reservoir capacitors charging up.


and for two minutes @ 40 watts?

It must be an ME.

--
Eiron

No good deed ever goes unpunished.

"Rob" wrote in message

Clearly in need of something to do - I bought one of
those power/volt etc measurement thingies and came up
with this:
Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at
about 63W, then seems to settle down after a minute or
two at 25W.

There is often a huge peak right at turn-on due to power supply caps
charging up. As others noted, this should be over with in fraction of a
second.

There may be some response time issues in the measuring device. Most of them
have a lot of averaging.

IME output stage bias networks generally start out cold a little skinny, and
then ramp up the bias as the circuits stabilize. But that could vary.