6146 gi ima vo slednite aparati :TS311(TX310), and also the 510 from TRIO used this tube. In the early 70's, there was a kit for a 6 m SSB transceiver and it used the S2001; the model number of this kit is QS500 from TRIO. (Oh, TRIO was Japanese domestic name for KENWOOD, now it is KENWOOD even in Japan. I receive the information that TRIO was called KASUGA-electric further early days.) (and TS310 and QS500 also use a 12BY7A as a drive tube.)
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