2sk77b

[AnthonyA]

Papa Nelson
I got a pair of 2sk77b. Wonder which design is best for it?

Best Regards

Anthony

 

[Rodeodave]

BAF2015, somewhere around the 36min mark:

YouTube

 

[Dr_Strangelove]

Where did you get those?!?

 

[AnthonyA]

Japan... Secret society.

Cost a bomb. 1000usd pair

 

[AnthonyA]

Thanks rodeodave.
I'll look at it

 

[Nelson Pass]

I also showed some curves for it.

 

[Zen Mod]

baad Papa!

 

[Zen Mod]

View attachment 791315
Papa Nelson
I got a pair of 2sk77b. Wonder which design is best for it?

Best Regards

Anthony

Anthony , care to share that paper (datasheet) , which is on photo?

TIA

 

[AnthonyA]

Yessss... Will take a photo later.. It's with my mistress

 

[WBS]

Is there a typo in the schematic, or is it just my ignorance showing early in the morning?

The cap to the left of 4N37 is labeled 10K. Should that be a 10K resistor? Or is it 10uF cap? I notice one of the two 10uF caps on the right is listed as 10K as well.

 

[Ben Mah]

No typo as far as I know. The cap to the left of the 4N37 is labeled 1K (1000uF) and the cap at the speaker output is labeled 10K (10,000uF).

I have built this circuit with those values and it works and it sounds great. Not with 2SK77B of course, but with THF-51S.

 

[indra1]

10K should read 10.000uF

 

[WBS]

Thanks for the clarification you guys!!!

@Ben Mah, did you build the THF-51S version point to point or did you design a circuit board?

 

[Ben Mah]

It's point to point. See 50w Single-Ended BAF2015 Schade Enabled (post #857) and 50w Single-Ended BAF2015 Schade Enabled (post #905).

 

[Nelson Pass]

Now Zen Mod has a pair...

 

[Ben Mah]

 

[Nelson Pass]

I expect that he will come up with a very amusing name for whatever they become.

 

[Soundhappy]

Now Zen Mod has a pair...

Fantastic + 1 pair with Michael Rotacher it's a diamond's gift

 

[Zen Mod]

I expect that he will come up with a very amusing name for whatever they become.

well , in this moment it seems it'll be either slightly Babelfished iteration of what you did show in BAF 2015 lecture ( with input buffer implemented in biasing, servo - still thinking about) , or it'll be some big bstrd with inductive load

however , no hurry ....... pleasure is in entire glass of wine , not just final felling in da belly

 

[Zen Mod]

though , it happened in the past that I surprised my self, doing something completely unplanned in the end, so it can happen again

not being an Engineer , I'm also free of all the Knowledge