You peer through a crevice in the back panel... There they are, the gleaming glass embodiment of lust, a row of 12ax7/6v6/2a3/EL34s, (use your imagination), you are home.
That's
another thing that never happens in this country — serendipitous tube finds. (It's the social differences). For a while, I was finding some in Akihabara, Tokyo. Of course, you pay for them there!