Digging into the nearly 40 years of Audio Note / Kondo M7 history has been somewhat challenging, but this is currently the best I have been able to bring together based on the various sources I have found across the web.
1980 - 1984, original M7
FET (by Shigeru Trerada and Shindengen) pre-amplifier with a tube power supply
1987 - 1998, M7 Tube
Tube - full facility MM phono pre-amplifier - 5 x 6072, 1 x 6X4
Tube Silver - silver caps in the line stage as well in the phono
(Note: there appear to be many sub-variants, including use of 13D3 in the phono, and using a 6072 as a tape buffer, and very early ones may have used 2 x 6072 & 1 x 5687 in the phono stage & then 2 x 6072 & 1 x 5687 in the line stage)
Phono - MM stand alone phono stage - silver caps - valves not known
Came in two versions, first ones were in a quite small chassis with no tube rectifier, later ones came in same chassis as M7 Tube
Line - line stage pre . - 1 x 5687, 1 x 6X4
Line Silver - silver caps
Early versions came in small chassis similar to early M7Phonos and did not have tube rectification.
2000 - 2005 M7 IIK
Standard - a full facility MM phono pre-amplifier - it appears earlier versions used 2 x 12AX7, 2 x 5687 and 1 x 6X4, and later versions used 2 x 12AX7, 2 x 6072, 1 x 6X4
Signature version - had 2 more valves (but I haven’t found out why), better quality valves and materials including a large Alps RK50 potentiometer
Line - 2 x 5687, 2 x 12AT7 and 1 x 6X4
Phono - MM stand alone phono stage - 2 x 12AX7/5751/ECC83, 2 x 12AU7/ECC82/ECC802S and 1 x 6X4
2006 - to date: KSL-M7
Standard - a full facility MM phono pre-amplifier - 2 x 12AX7, 2 x 12AU7, 1 x 6X4
Line - 2 x 12AU7, 1 x 6X4
Phono - MM stand alone phono stage - 2 x 12AX7, 2 x 12AU7, 1 x 6X4
As Chris has an “M7 TUBE Silver Sound”, this suggests it is from the 1990s (the presence of Black Gates also indicate this) and it has silver coupling caps in the phono and line stages, following this it should “probably” have 5 x 6072 and 1 x 6X4, as per the classic circuit diagram from 1991, as seen here:
https://www.diyaudio.com/forums/attachments/tubes-valves/292487d1342874069-audio-note-m7-line-preamp-audionote-m7-pre-sch_01-pdf
Now to track down some of the components the previous owner considered surplus to requirements 