Re: Transformer flux imbalande solutions

On Mon, 17 Aug 2009 15:19:11 -0500, "Tim Williams"
<tmoranwms@xxxxxxxxxxx> wrote:

"JosephKK" <quiettechblue@xxxxxxxxx> wrote in message
news:2qaj85hf5cimqihaqmo1rrhofj1jbbk84j@xxxxxxxxxx
Reminds of when as a kid i saw an amplifier rated at 100 W that was 2"
by 5" BY 8". Then i saw that the rating was PMPO. But that was 40
years ago. A lot of such ratings today are "marketing magic" of the
same kind

Wow, I didn't know they used PMPO that long ago. That's hardly out of the
tube age. I thought marketing was just discovering "watts RMS" back then!

Why are you jerking us around, never mind, you are just a jerk.

Not to be picky or anything, but who uses an output transformer any
more?

Just to be sure, we've been talking about the switching supply's output
transformer. But actual audio outputs? Those went out of style in the
*early* 60s.

Naw, not until the 1970's

Last beast I saw with real iron must be my dad's Mcintosh something power
amplifier -- good for over 300 real watts into any kind of load you want.
He bought it in the 70s. They put autotransformers at the end, so the
amplifier always drives around 3 ohms, and you can connect anything from 2
to 32 ohms.

One might theorize this is the reason why Mcintosh hardware sounds "so good"
(in the tubophile sense) -- the only fundamental difference between your
average tube and SS amps is the output transformer.

Transformer? Who do you think you are.

High output units? Who can dissipate hundreds of watts inside a
dashboard?

Well, those 1kW+ amps are fairly hunky, and they have a lot of aluminum to
hold in the heat from peak loads (class B giving ~60% efficiency, that's
easily 1.6kW input and 600W dissipated). Definitely not continuous duty,
last one I saw used fullpack TO-3P outputs. Hardly 50W capacity in one of
those. There were 8 of them, not quite enough for all that dissipation,
especially after ten or twenty seconds when the chassis starts getting
really hot.

But that's more of a floor-of-the-trunk environment, too. I don't know if
they make in-dash radios over 50W (being the 12V bridged into 4 ohm rating).

Tim
.

Relevant Pages

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