Tubes

6X4 USED or Off-Brands, Not tested, no guarantee...

6X4WA. .

6X8 .

6X8 or A Used or off-brand. Not tested, no guarantee

6Y3G

6Y6G or VT 168A.

6Y6GT

6Z10 / 6J10

6Z4 USED or off-brand, not tested, no guarantee

6ZY5G.