Re: Research on Tube and Transistor sound

"Bret Ludwig" <bretldwig@xxxxxxxxx> wrote in message
news:1135126468.101005.155890@xxxxxxxxxxxxxxxxxxxxxxxxxxxx

> Arny Krueger wrote:

>> By the time the conference paper was published in the
>> JAES SS technology had progressed well beyond the
>> circuit examples in the Hamm paper.

<snip childish profanity and prerequisite subjectivist personal attack>

> The laws of physics
> have not changed, and improved discrete transistors
> change the picture only incrementally.

Bret, you're talking just discrete transistors and I'm talking the totality
of SS technology.

If you actually read Hamm's paper and understood is, you'd know that his
paper was full of deceptive arguments. For example he compared the
distortion of single stage triode, pentode, and transistor amplfiers (figure
2).

What Hamm's paper ignored is the fact that the gain of pentode and
transistor stages are far higher. He also ignored the fact that even way
back then, one can economically build far more amplification stages with
transistors than tubes. One can usually trade gain off for lower distortion
with local or loop feedback. But Hamm seemingly *forgot* to mention that.

As we all know, triodes have massive amounts of internal negative feedback,
which pentodes lack by design, and transistors simply lack.

If you're going to do an apples-to-apples comparison of amplifiers, then
they should all have the same amount of gain. Hamm never did that comparison
because engineers knew, even then that if you decrease the gain of a pentode
or transistor amplifier stage to that of a triode, their distortion
characteristics are similar or better.

Hamm also deceptively loaded the deck against the higher-gain alternatives
by plotting distortion against input signal in figure 2. The higher gain
pentode and SS alternatives simply put out larger signals that of course had
more distortion than the low-gain. low-output triode.

Do you see the difference between a tiny subset of SS technology and the
whole blooming technology?

Do you see that Hamm's paper was full of deceptive comparisons?

<snip more of the prerequisite subjectivist personal attacks>


.

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