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In Reply to: RE: So then: posted by sony6060 on December 17, 2014 at 13:25:40
All power supplies do not sound the same.In fact a power supply with additional filter capacitance will better handle peaks.
And as I said, power supply impedance effects the so called "sound" especially in SET's.
Let's just be clear on what a LSES is and how it works. It is not a "properly designed" power supply for the intended load. It is current starved and that is exactly what produces the desired effect - artificial dynamics.
You could argue successfully that if turning an amplifier into a dynamics processor is the goal, then the power supply IS "properly designed" for that purpose.
What ever.
Again just be clear on how a LSES works and what in turn it does to the amplified audio signal. If that's what you want, then the LSES is in fact an elegant way to synthesize dynamics without resorting to analog VCA technologies, aka DBX, or digital processing techniques.
P.S. There is never a panacea in engineering either. The artificial dynamics boost comes at a price - more ripple induced hum and possibly more clipping.
Edits: 12/17/14Follow Ups:
actually gusser, I'm starting to think "clipping" is part of the reason people prefer SE over push pull.
I especially think the 12ax7 DC into a 2a3 does soft clipping extremely well. (particularly with the bandwith limiting of small cap cathode bypass)
I don't agree with your assessment on the power supply, but there is some truth in the fact that the whole cap bundle, power supply, insufficient drive for miller etc all are a form of EQing.
Fine to disagree with my theory of how it sounds.
What is your technical analysis of the LSES power supply?
well... I think:
- due to class A and low current draw
- low mu finals allow for less filtering
- ac filaments means there is a noise floor regardless
- small chokes filter HF well
- ultra clean driver stage
that DFs supply works just fine for a 2a3 or 45. I don't think there is any "dynamics expansion."
I'm also working on my first amp with an l-critical choke input right now, so I'm not hard line. I do believe the supply works and is plenty quiet.
also in fairness, I'm actually running the power supply Jeff has now abandoned. So I'm working with a 2 henry choke.. (along with the flywheel input deal)
on a final note, I'll never cut up factory chokes or power transformer leadouts again either. :)
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