+1 I have a similar stash waiting for a hint of what the master is releasing for the Tokin devices and the new Sony VFET release.
Hmm I have 2 matched pairs of THF-51s and a quad of used SK180s.
And I don't need an amp. So it's probably enough 🙂
And I don't need an amp. So it's probably enough 🙂
Glad that I got an order in a couple weeks ago. This announcement can’t be good news for world supply 😀
It makes little commercial sense to design around an obsolete part but this isn't a commercial enterprise. Perhaps you are on the wrong website? This is DIY.
And you are not alone 🙂
I bet lots of these will be changing hands in swap meet for years to come 😛
Good news for Diyers by Watanabetomoaki 1pc THF-51S (2SK77,2SK180,2SK182ES)TOKIN SIT (V-FET) NOS Original | eBay
Around 98 pcs. available today
Around 98 pcs. available today
Is there a big difference amongst them?
THF-15 vs 2SK77 vs 2SK180 vs 2SK182ES, etc...
THF-15 vs 2SK77 vs 2SK180 vs 2SK182ES, etc...
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You can't actually get 2SK77 but THF-51S seems to be slightly better than 2SK182ES if you have a choice. If you don't have a choice then any of those 3 (THF-51S, 2SK182ES and 2SK180) are all great to have. The 2SK180 needs to be bracket mounted as it protrudes downward through the mounting surface like a T0-3 device while the other 2 can be mounted flat and secured through 2 tabs with the contacts sticking up.
Interesting question. Some more power (current really) capacity for the 182 vs the THF51. Toff for the THF51; 50ns vs 300ns for the 2SK182E. Does this speed translate to better sound? Anyway, I must obviously order a nice pair.
2SK77 being sole one made for audio
other ones made for elevator motor controllers, industrial ultrasound bath zingie, and probably even some military use
in practice - snatch any
though, THF51 (any suffix) is one I'll look first, lowest THD in constructions I tried so far
in DEF style output stage, differences between them is diminished
Perhaps it's a matter of finding a good operating point for the 2SK182ES? Maybe higher voltage than with THF-51S? The 2SK182ES can handle higher power dissipation. Higher voltage, current, power output? A super duper high power single ended common source amplifier?
well, it certainly is a game of finding sweet spot, in boundaries placed by particular project
there is a one set of compromises if we stay at, say 65V rail, comparing to if we go up to 90V, speaking of something as Singing Bush
all roads are leading to Rome ..... but let's wait for Papa's road-sign
I know nothing, so can presume in same amount
Now I also "got spoiled" and purchased 4 of the THF-51S.....just 4 singles....
I can hope he selects randoms so there is a little chance that two are close.....but if he has tried to match all he has....I will probably get those that was not possible to match. We will see....
It was from Watana....... appox. $55 each + shipping.....
At least it is cheaper than a NOS pair of WE300 from 1955......
I can hope he selects randoms so there is a little chance that two are close.....but if he has tried to match all he has....I will probably get those that was not possible to match. We will see....
It was from Watana....... appox. $55 each + shipping.....
At least it is cheaper than a NOS pair of WE300 from 1955......