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