2sk77b

[Dennis Hui]

Hi Bob,

I asked a while back the question of what tube amp for a PL/FW fan, and got
some suggestions:

Tube amp for a PL/FW fan

Cheers,
Dennis

 

[flocchini]

Thanks Dennis - I'll check it out

 

[flocchini]

Claas

Beautiful amp

Thanks for sharing

Bob

 

[Itsmee]

...Only have 4 THF-51S spares

Just enough for a circlotron 😀

 

[Itsmee]

Haven't built it - MoFo valve gain stage

 

[AnthonyA]

[/ATTACH]

 

[AnthonyA]

One of the local guys.

 

[Ben Mah]

Very nice. How does it sound?

 

[Zen Mod]

looking nice , except a fact that L bracket positioning is exactly opposite of best one , which is approx. 1/3 of heatsink height, starting from bottom

though , if heatsink is oversized ...... and that one looks as good enough for 180W of heat , it really doesn't matter that much

yeah , share what you guys think about sound ........ and also - it would be interesting to hear how many of these funny pucks you guys bought .....

🙂

 

[Soundhappy]

[/ATTACH]

Cute amplifier 😀 Bravo!
How much VA power is Your toroidal transformer ?

 

[AnthonyA]

5a me think... It's what papa prescribed voltage.. Sounds don't know yet... Haven't mess around

 

[woody]

That aluminum bracket represents a lot of thermal resistance. It might be better to mount those devices flat on the heatsink .

 

[Russellc]

time will tell and I'll show what I did

Will this also work with THF-51S ? I do have a spare pair.....

Russellc

 

[Zen Mod]

Will this also work with THF-51S ? I do have a spare pair.....

Russellc

yup

besides making Big one for Mighty Moi , greening all the time simply having mental image of Mithrandir's cunning smile , I need to make THF iteration for my Polish friend

so , will probably make it as complete project , maybe even including everything needed for Papa's Poor Men All-Mos iteration , presented in same BAF 2015 video

as we are speaking , I'm making Eagle packages for 2SK77B and IXFN140N20P

😛

 

[Russellc]

yup

besides making Big one for Mighty Moi , greening all the time simply having mental image of Mithrandir's cunning smile , I need to make THF iteration for my Polish friend

so , will probably make it as complete project , maybe even including everything needed for Papa's Poor Men All-Mos iteration , presented in same BAF 2015 video

as we are speaking , I'm making Eagle packages for 2SK77B and IXFN140N20P

😛

I will stay tuned for that, although I need another project like a hole in the head, it hasnt stopped me lately. Using this winter to finish a few projects that have waited long enough, some merely waiting for chassis.

Russellc

 

[toto34]

Good evening, gentlemen.
Where can we find real 2sk77b?
Thank you

 

[Soundhappy]

5a me think... It's what papa prescribed voltage.. Sounds don't know yet...

Thanks AnthonyA, another question : how much is bias (- B) voltages for SIT's?
Me know very well triode simulation with IXYS mosfets and Tamura input transformers only , but my amp builds have a CCS version with A, B, C and D connection points from 2SK77B schematics.
Is a DIY option simple tip just solder double switch from CCS points C to D so You get two different sound signatures possibilities to chose from only one amplifier. Is twice fun with the music play 🙂

 

[Soundhappy]

CCS picture 😀 In the future this switch be on the chassis rear panel and easy accesible from the outside

 

[Zen Mod]

hope you're not using that tiny green switch for speaker route 🙂

btw. I had some fun this evening .... whenever I have no energy for something "more demanding" , I'm finding pcb fun very relaxing

 

[Soundhappy]

hope you're not using that tiny green switch for speaker route 🙂

Work perfectly ..this Sato Parts Japan handle 6A of current and can be locked for security.
Gold plated contacts in hermeticaly saled box Is a Big Green Switch Have a nice pcb design evening