I have a single pair of 7788. And at $30 each for spares, this is the rarest tube I have considered using in one of my experiments( when replacements are sooooo bloody 'spensive ). I have not done it yet though....
SE 2A3 maybe for the TX's...or PP 45.
Did I mis-understand? It looks like all four got sent to one person, and the other three ov you will have to wait for an individual shippment.
regards,
Douglas