Tubes

6SN7WGTA

6SQ7 or GT USED or Off-Brand, Not tested, no guarantee

6SR7. .

6SS7 USED or off-brand

6SZ7

6T7G see also 6Q6G

6T8 USED or off-brand. Not tested sold as-is, no guarantee

6U10. .

6U4GT .

6U6GT.