Hockey Puck SIT 2SK180 by Tokin source NOS

[sierra_gva]

Thank you soundhappy. So it is all M4, except the brass welding washer that needs to be 4.2mm and fhe transistor washer TW10 ? Correct ?

 

[Soundhappy]

I will make pictures tomorrow with two mounting kits on real transistors,
one 2SK180 and THF-51S/2SK182ES so we must be sure not make choice mistakes
or lack something.
Principe is the same like for classic TO-3 but with bigger size.
Must go sleep now. Good night

 

[sierra_gva]

Thanks Soundhappy. For the M4 screws, what length do you suggest ? I know it all depends of the heatsink... 25mm ??

 

[nicoch58]

will sound better

 

[Zen Mod]

what's wrong with this picture?

 

[Botte]

Other than the speaker phase is reversed, I don't see an issue

 

[Zen Mod]

I'm looking and listening upside down, so for me it is not reversed

 

[pinholer]

I don't see what's wrong, but I would do the grounding a little differently. I would bring the PSU ground to the CCS board and then return the speaker and THF grounds to the board. This would minimize the current loops. That's what I did on my BAF2015 THF amps.

 

[Zen Mod]

I don't see what's wrong, but I would do the grounding a little differently. I would bring the PSU ground to the CCS board and then return the speaker and THF grounds to the board. This would minimize the current loops. That's what I did on my BAF2015 THF amps.

Botte is making fun of me, which is normal thing ...... though, I'm rarely thinking about phase at amp output ( being easily reversed with speaker wires)..... for me - red terminal is hot; what you're going to do with polarity, who's going to tell

regarding wiring - power GND is connected to "power terminal" - source of SIT itself

there is hardly any energy flowing to pcb itself, and - at least in my organisation of things, this is most logical layout

in someone else's arrangement , different wiring layout could be better

though, point was in bushings, wire eyelets, washers , split washers and screws

 

[Zen Mod]

what's wrong with this picture?

now I see ...... sorta clumsy formulation .... what I meant is - there is already a picture with contacts and isolators arrangement , which I posted in July 2020, so nothing wrong if one take a look

funny ZM, usually not playing Quiz games

 

[Soundhappy]

Thanks Soundhappy. For the M4 screws, what length do you suggest ? I know it all depends of the heatsink... 25mm ??

Yes is depending on the Heatsinks dimensions and how deep you want to go with the screws inside the aluminium mater.
15 mm (0.59") to 20 mm (0.78") long is sufficient for direct mounting on the Heatsinks with THF-51S/2SK182ES.
Will be 5~7 mm less deep because flat washer + nylon bushing + transistor metal base +
thermal keratherm pad ( more if fat ceramic version used ) thickness

 

[Soundhappy]

So it is all M4, except the brass welding washer that needs to be 4.2mm and the transistor washer TW10 ? Correct ?

For your THF-51S or 2SK182ES no choice , wire is directly connected to the SIT case = drain
so only welding washer biger than external diameter of the TW10 nylon bushing in this case 5.2mm need be used

 

[Soundhappy]

will sound better

I agree with you.
The documents about the mounting of transistors in general is not made specially for high quality audio.
The best is a direct connection with the transistor case = drain no doubt.

In some situation of internal chassis wiring possibilities intermediary connection
of the drain by contact case and screw with solder lug and metal washer do the job.
Wire is less exposed on the high temperature heat because physical distance.

Your choice

 

[Soundhappy]

Hundreds are now in the Diyers possessions, but they are still available from Watanabetomoaki -San in Japan https://www.ebay.com/sch/watanabet...Yl8AAOSwYjdgPc3t&rt=nc&_trksid=p2047675.l2562

 

[Soundhappy]

Curious what the circuit tricks, Mr. Pass says in one of his last interview " The New paradigm in amplification "

Keep Tokin for this one build

 

[Soundhappy]

1 pcs. of this Kerafol Keratherm Red is a high quality product
Kerafol 86/82 Thermally conductive film 0.25 mm 6.5 W/mK (L x W) 100 mm x 100 mm | Conrad.com
https://asset.conrad.com/media10/ad...025-mm-65-wmk-l-x-l-190-mm-x-190-mm-1-pcs.pdf
after cut you get 4 pads for 4 big Tokin transistors,
so price of one is around ~ 3,33 € with VAT taxes included + shipping ( buy other components at the same time )

 

[grendel23]

Conrad doesn't ship to North America, but this product is available on Amazon.
https://www.amazon.com/Keratherm-Thermal-Pad-100x100x0-25mm-Conductivity/dp/B08DDH16SS/ref=sr_1_1?dchild=1&keywords=keratherm+red&qid=1616797383&sr=8-1

 

[Soundhappy]

@ Grendel23

Thanks for the useful link
Keratherm is having adhesive coating

 

[Soundhappy]

Conrad doesn't ship to North America, but this product is available on Amazon.
https://www.amazon.com/Keratherm-Thermal-Pad-100x100x0-25mm-Conductivity/dp/B08DDH16SS/ref=sr_1_1?dchild=1&keywords=keratherm+red&qid=1616797383&sr=8-1

Free delivery in USA Interesting offer. Thanks again

 

[Soundhappy]

The first example project under preparation is an amplifier simple enough to serve
as the test rig. This week is launch of DIY Sony VFETs, so I'll put the documentation
together next week.

Thanks a lots Mr. Pass Amazing
Spring days is sunny with Watt's New DIY articles.
Super cool we can build this simple Tokin amp first
make tests and evaluations and enjoy music
then build next complex version in the future

Buy Tokin at good price from Watanabetomoaki San from Japan https://www.ebay.com/sch/watanabeto...9111X1517312X2036b150d26f71de032dcaaee3bade39