as seen in the 1968 Radio Shack catalog (courtesy, of course, of www.radioshackcatalogs.com )
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That's why the thirty-five dollar speakers are always worth a look -- whether they throb or not, and independent of the depth of their throats.They're proven superior to speakers costing $32!
I would guess they are "Tube friendly" !
Wow, read through a certain prurient frame of mind, that ad is FULL of double entendres...