Digital Amps vs Solid State Amps

"We have a Levinson 333.5. "

Then simplest thing of all is to buy or audition Levinson No 53 - fully class D amplifier monoblocks and compare...

Can't do that - then call to manufacturer (Madrigal Labs, I believe) and discuss why they built their newest flagship as class D amp...

Please report to us.

"I believe the digital amp technolody has a ways to go. Linn started the idea in the mid 90's "

Hello Levchappy,

The idea of switching i.e. Pulse Width Modulation, PWD power amplifiers started at about the same time as FM radio

The first commercial hi-fidelity switching amplifier was demonstarted by John Ulrick, cou-founder of Infinity Speakers, in 1974 CES Chicago. Today he is the President of Spectron Audio.

In order to judge audio compenent you really must audition it within your system and may be for some time.

In that regard, Spectron and surely some others have 30-days money back guarantee policy.

Rest is up to you.
Good Luck

"It was Hi-Fi amp - it says so on the box (LOL)"

Yep, and instructions enclosed as well.

from SOUND & VISION, issue January 2008
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"50 Greatest A/V Innovations: The most revolutionary products & technologies of the past 50 years"

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"Digital Amplifiers:

Going back to the Infinity SWAMP 1 of the mid-1970s, digital amps have had a checkered history, but they seem finally to have turned the corner in terms of reliability and performance. Highly efficient and cool-running, they promise to play a bigger role in the future."
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SWAMP was this Infinity amplifier developed by John Ulrick and shown at CES 1974....