MPP

[misterdog]

I can see Calvin designing some new ESL's already....

 

[Joachim Gerhard]

https://www.youtube.com/watch?v=hQFplYJMC1A

 

[RCruz]

https://www.youtube.com/watch?v=8GqoWjnieRc

 

[Joachim Gerhard]

https://www.tape.tv/rebecca-ferguson/videos/strange-and-beautiful-ill-put-a-spell-on-you

 

[Bksabath]

https://www.youtube.com/watch?v=F2vWZDldCsI



BTW look like grapheme is going to be the next big thing


I am working on a TT tangential arm that uses Pyrolitic graphite to float the wand https://www.youtube.com/watch?v=TlD12QObooc

 

[Joachim Gerhard]

Accuphase has a new super low noise phonostage, the C-37.
That comes as a surprise because the stage they made before is only on the market for ca. 2 years. It uses NPN BJT transistors at the MC input.
It is the 2SC6000. I could not find a complement so far.

 

[mkc]

Hi Joachim,

What do you think made them pick that one?

Mogens

 

[Joachim Gerhard]

http://www.toshiba.com/taec/components2/Datasheet_Sync/201211/DST_2SC6000-TDE_EN_10758.pdf

many medium power bjt´s have very low voltage noise.
this one has also high and linear hfe and a very high early voltage at a current that works for lowest noise
both, hfe unlinearity and early effect, are sources of distortion.

 

[Joachim Gerhard]

it also has high speed and low saturation voltage if that matters in the particular design

 

[Joachim Gerhard]

toshiba

here is some detail how they are made and how fast they switch
this multiple island layout brings low Rbb

 

[Joachim Gerhard]

this one ios not a perfect compliment but it could work :

http://www.toshiba.com/taec/components2/Datasheet_Sync/200612/DST_2SA2097-TDE_EN_7703.pdf

 

[mkc]

Joachim,

I seem to remember you estimated or got an indication of rbb from the datasheet, which didn't specified it. Was it VBEsat you used?

Mogens

 

[Joachim Gerhard]

The only good way is to measure it with the substitution method.
I have shown how that works. The other way is to build a circuit and listen.

 

[mkc]

Hi Joachim,

I just remembered. Did you receive the riaa and linestage schematics from me? I wont mention the name here.

Mogens

 

[Joachim Gerhard]

sorry, i can not remember

 

[mkc]

Hi Joachim,

They were drawn in LTSpice and I send them to your suesskindaudio mail address. Please let me know if they got lost.

Mogens

 

[Joachim Gerhard]

Please send this again.

 

[mkc]

same mail address?

 

[Joachim Gerhard]

Use : joachimgerhard@suesskindaudio.de

you can find it on our webside anyway

 

[mkc]

Hi Joachim,

mail sent. Please let me know if it didn't get through.