Hi Tubholics ! Did someone test the "hybrid preamp" of M KANEDA ? On these , you can find a twin triode with CCS as input , a pair of PNP hivoltage transistors , and a serial PP with another twin triode as output stage . The trouble (IMO ?) is with these sanded 2SA1967 are said to be PNP . Looking at NEC data sheet, they are NPN 900v Vce 
So : 
??? Any advice ?🙄
So : ??? Any advice ?🙄
...following:
I've just received a post from Japan explaining that translating the datasheets from japanese to british language was a source of mistakes
So , the 2SA1967 is a real PNP in Japan and became an NPN for the rest of the world 😉 
happy DIY
I've just received a post from Japan explaining that translating the datasheets from japanese to british language was a source of mistakes
So , the 2SA1967 is a real PNP in Japan and became an NPN for the rest of the world 😉 happy DIYYes, Japanese transistor names have a simple rule:
2SA and 2SB: PNP
2SC and 2SD: NPN.
Originally, the difference between 2SA and 2SB was high frequency (like radios) use vs. low frequency (like audio amplifiers). But, these days silicon transistor has high fT even named as 2SB. Same thing happens to 2SC (RF) and 2SD (AF).
2SA and 2SB: PNP
2SC and 2SD: NPN.
Originally, the difference between 2SA and 2SB was high frequency (like radios) use vs. low frequency (like audio amplifiers). But, these days silicon transistor has high fT even named as 2SB. Same thing happens to 2SC (RF) and 2SD (AF).
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