Contact

Questions, corrections, or stories about vintage Japanese semiconductors — all welcome.

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What I can help with

Technical questions about devices featured on this site
Corrections or additional information for published articles
Identifying or verifying vintage Japanese transistors
Questions about measurement data or the archive in general

A note on requests

Simple questions about devices featured on this site — happy to help.

For authenticity checks, I can share a quick, photo-based opinion. Requests that require measurement, extensive cross-checking, or a large number of parts may be difficult to accommodate. If so, I’ll tell you plainly.

About SPICE models

My SPICE models are still a work in progress. The measurement setup is being improved, and full validation against real hardware behavior is not complete yet.

Some areas remain especially difficult — for example, parameters like RB, RBM, and TR, and certain device families (notably germanium). Public release is still some way off.

Please note: I am unable to provide individual SPICE models by email at this stage.

Response time

I maintain this archive alongside a full-time engineering position, so replies may take a few days. I read every message and will do my best to respond.

I am a native Japanese speaker, but English communication is very welcome. I may use translation tools to ensure accuracy, but the technical content will always be my own.

— Kaz