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Old 5th October 2006, 04:26 AM   #11
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Thumbs up Better Way !

I had used +B SMPS for TUBE AMPLIFIER !

100KHz RT*CT, 550V for power tube, -150V for grid bias (variable), 25.2V for 2CH filaments (6.3+6.3+6.3+6.3), choke 10H, remote on function

Max power is 250W but power consumtion for 30Wrms is only 150W !

Next project is 100Wrms with PP EL509 included sgreen bias circuit

Regard
analog guy
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Old 5th October 2006, 05:33 AM   #12
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This is very interesting. Care to share your comments between SMPS VS Linear in your setup?

I am planning to build an OTL with +170V and -170V
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Old 5th October 2006, 10:45 AM   #13
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Thumbs up Both Good

When I compared both Linear and SMPS I found same result about maximum power output ! but there're some different in audio term...

Linear : more deeper bass and airy : 6KGs : BIGGER
SMPS : focus and warm human voice : 0.6KGs : SMALL and SLIM

When I sold them, I'm very happy about weight shipping (20USD)



Uploaded picture is my inspiration !

Thanks
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Old 5th October 2006, 11:27 AM   #14
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Thanks for your comment!

I would have thought that SMPS will provide faster transcient response and therefore faster and tighter bass!
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Old 5th October 2006, 02:13 PM   #15
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Quote:
Originally posted by cerrem
SMPS have gotten a bad rap..and for good reason....
Most of the textbooks on switchers are way outdated with 1980 technology...as well as many SMPS engineers are outdated and clueless as well.....

The use of a properly stabilized Quasi-Resonant switcher at or above 500kHz will work out really well for audio applications..

Chris
Facit-> Chris, In the mid 90's I did alot of work with the UC3895 and other resonant ic's, but it had a serious bug in it which was too risky for high power applications. This ic had ramp troubles when light load or no load conditions prevailed.
You will be glad to know I use a kW hard switching PFC in my 500W tube amp which creates no interference.

QUOTE ...> As well as many SMPS engineers are outdated and clueless as well.....true true...(I hope you aren't implying me ??.....) However, there isn't such a thing as outdating the laws of physics. the use of is another matter.
The concept of resonant switching has been around for decades but expense has often ruled it out of a particular design. A SMPS design engineer should have full RF design experience as well an allround in magnetics. Not many of us about anymore.

richj
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Old 5th October 2006, 02:20 PM   #16
ssanmor is offline ssanmor  Spain
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Quote:
Linear : more deeper bass and airy : 6KGs : BIGGER
SMPS : focus and warm human voice : 0.6KGs : SMALL and SLIM
Well, as I said I don't have experience with tube amps, but with Class-D and linear solid state amplifiers, our experience is the opposite: sound is at least as clear and bass seems deeper and more controlled with SMPS (I agree in the size/weight considerations, of course)

Let's see what our customers find when they test this curious combination.
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Old 5th October 2006, 03:59 PM   #17
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ssanmor,

Can I ask you what ss smp did you tested your SMPS on? I guess it would be a good project for Aleph amp too
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Old 5th October 2006, 05:32 PM   #18
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Hello all.
This is my first comment here in the forum.
I'm very interesting about SMPS to replace the toroidal transformers.
What is the best SMPS topology for supply tube amplifiers?
Im thinking about Foward topology.

Thanks.
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Old 5th October 2006, 06:17 PM   #19
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Quote:
Originally posted by gmarinelli

What is the best SMPS topology for supply tube amplifiers?
Im thinking about Foward topology.

Thanks.

We need to know what the power requirement of a particular amp. Flyback topology is dirt simple at low cost, but there becomes a line in the sand when other configurations are more attractive.

For example I have a tube preamp that requires 300V B+ at 50mA so I'm using 50KHz flyback with a HV doubler. The piecemeal advantage with flyback is excellent cross regulation with other windings, so heater 6.3V+ 0.6V (keeping to whole number of turns) can be taken as the design integer (v.s primary) for calculating the HV number of turns.

The rotton business with the forward is a choke required for each secondary unless one uses the coupled inductor approach.


richj
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Old 5th October 2006, 08:28 PM   #20
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Rich,
I agree with you. I made a confusion between flyback and foward.
Good to know you are using this kid of topology.

GMarinelli.
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