AoE x-Chapters 3x.18, audio power transistors

[Winfield Hill]

I've been too busy lately, working on the
book, to look at the conversations around
recent x-Chapter draft postings, but will
get time soon. Meanwhile, an email from
our editor prompted a post this morning:

Power Transistors for Linear Amplifiers,
3x.18, will be elevated back to its proper
position as a full-blown section of its own,
now keyed as \xahead, and not merely \ahead.

https://www.dropbox.com/s/vaesyvrgcvdgjg6/3x.17_3x.18_DRAFT.pdf?dl=1

The DRAFT is pre-fix. Check out Table 3x.6,
and study the graphs in Figures 3.117 and
3x.118, what an interesting set of curves!
I gathered candidate parts, Paul took SMU
measurements, polished graphs in Illustrator.

I look forward to seeing suggestions and
comments from the DIY audiophile crowd.


--
Thanks,
- Win

 

[George Herold]

Hi Win, I just want to say how great it is that you and Paul are
doing all this.
(I was going to complain about graph 3.x118... but then connected it to
3.x117. I tend to look at the graphs/ schematics first and then read the
words.)

George H.

 

[Phil Allison]

Winfield Hill wrote:

https://www.dropbox.com/s/vaesyvrgcvdgjg6/3x.17_3x.18_DRAFT.pdf?dl=1

The DRAFT is pre-fix. Check out Table 3x.6,
and study the graphs in Figures 3.117 and
3x.118, what an interesting set of curves!
I gathered candidate parts, Paul took SMU
measurements, polished graphs in Illustrator.

** The lateral mosfets you mention ( 2SK1058 ) are from Hitachi, now Renesas not Toshiba.

Toshiba do or at least did make vertical types ( 2SK405 ) with low gate thresholds claimed to be suitable for audio output stages - but of course suffered from all the usual drawbacks of thermal runaway, needing source ballast resistors plus matched sets for parallel operation.


..... Phil

 

[Winfield Hill]

Phil Allison wrote...

Winfield Hill wrote:


https://www.dropbox.com/s/vaesyvrgcvdgjg6/3x.17_3x.18_DRAFT.pdf?dl=3D1

The DRAFT is pre-fix. Check out Table 3x.6,
and study the graphs in Figures 3.117 and
3x.118, what an interesting set of curves!
I gathered candidate parts, Paul took SMU
measurements, polished graphs in Illustrator. =20

** The lateral mosfets you mention ( 2SK1058 ) are from
Hitachi, now Renesas not Toshiba.

That's right, thanks for catching that.


--
Thanks,
- Win