WTB 100TH 100TL or 75TH Tubes

[K3YA]

I'm looking for modulator tubes for my Collins 30K4 that I wrote about last winter.  I found a real Collins modulator deck to go with it, but need some tubes.  It turns out that out of the four 100TH's that I have available, 3 are really gassy and 1 is just worn out.  Any pair of the above will work. 

Thanks
Charlie