Dear bbrase,
very nice system.
I have had a Shindo Catherine in the past and I just bought a Shindo Giscours like yours (two monaural preamps). Serial number of mine is 5.
I have seen two other Giscours that inside are different to mine. My Giscours has 2 tubes in power supply instead of one.
Tubes in my preamp are: E80CC, ECC82, ECC83, 6BM8 and 6X4.
Could you tell me tubes inside your Giscours?
Regards
Pietro