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Old 24th March 2004, 07:52 PM   #11
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Default Re: I was being serious....

Quote:
Originally posted by dhaen
Now we're being ridiculous
So how about Black Holes and Quantum Foam

Mmmmmmm, Quantum foam! Goes great with Hot Cocoa!

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Old 24th March 2004, 08:05 PM   #12
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Quote:
Originally posted by analog_sa
John

Synchronous rectification is what i also suspect but it may even be more prosaic. Curious though, would the switching and phase detection arrangement not introduce more noise?

Not with fast SS cicuitry. I believe John was referring to the old relay version, which was actually used since the early 1900's in cars where they used AC generators as opposed to our modern alternators. The relays would convert AC to DC.


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Old 24th March 2004, 08:05 PM   #13
LaZarus is offline LaZarus  Netherlands
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Walt Jung writes about a full wave ac-dc converter without a rectifier. I haven't read that part, but it could be interesting.

Follow this link and look on page 150.

Cheers
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Old 24th March 2004, 08:09 PM   #14
imix500 is offline imix500  United States
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I know that professional audio Solid State amps have been using digital high frequency switchers for several years with great success, in fact most are moving in that direction. But how a 40kHz switcher would play with a tube amp is questionable.
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Old 24th March 2004, 08:16 PM   #15
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All I know is, if it has an AC cord, it HAS to have some sort of rectification, period, no bones about it, end of story!! Even if it used a generator (120VAC motor > 400VDC & 6.3V generator) it STILL has rectification because the very function of the commutator in the motor synchronously rectifies the winding voltage.

Some vibrators had DPDT contacts, providing synchronous rectification. Most probably used a 6X4 or something.

I vote for the same thing that causes every "high-quality" tube amp to be upwards of $10,000. Marketing bull****.

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Old 24th March 2004, 08:32 PM   #16
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Only $10,000?

How about one for $90,000!!!!!

Dick Sequerra makes one for that much. Holy Moly!

But now I digress.


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Old 24th March 2004, 08:35 PM   #17
SY is offline SY  United States
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Quote:
Originally posted by imix500
I know that professional audio Solid State amps have been using digital high frequency switchers for several years with great success, in fact most are moving in that direction. But how a 40kHz switcher would play with a tube amp is questionable.
Switchers have been used in some tube amps and preamps with excellent reputations, even going back to the '70s. Audionics and Berning are two that come to mind. I've still got a well-modified TF-10 with a 40kHz switcher- all discrete, yet.
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Old 25th March 2004, 12:49 AM   #18
jlsem is offline jlsem  United States
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A 300B on batteries? Don't think so. It's probably some market speak as usual refering if anything to the absence of diodes.
Yes, it is indeed a battery powered - thirty-something 12 volt batteries in series. It's made in Korea and it costs more to ship the power supply from there than the batteries cost. Beautifully made stuff although it's only a simple WE91-type circuit.

John
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Old 25th March 2004, 04:37 AM   #19
SHiFTY is offline SHiFTY  New Zealand
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My guess is marketing speak for switch mode power supply.

Think computer power supply, with a 6.3V and 350V capability.

Transformers are generally better, as they aren't as noisy.
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Old 25th March 2004, 05:22 AM   #20
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Just a nice pic of the inside (be patient):

http://www.lothx.com/mj4.jpg

It is stated somewhere else that is being rectified with ferriet choke resistors en caps ?!
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