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coresta 19th May 2006 12:26 PM

Kaneda hybrid preamp error ?
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 :bigeyes: So : :xeye: ??? Any advice ?:rolleyes:

coresta 22nd May 2006 02:40 PM


I've just received a post from Japan explaining that translating the datasheets from japanese to british language was a source of mistakes :smash: So , the 2SA1967 is a real PNP in Japan and became an NPN for the rest of the world ;) :att'n: :clown: happy DIY

cpu_bach 23rd May 2006 01:35 AM

Yes, 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).

cogsncogs 23rd May 2006 04:07 AM

2SJ -> p-channel
2SK -> n-channel

Wild guess:
JAN part #
1N = 1 junction
2N = 2 junctions
and so on...? :)


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