Quote:
Originally Posted by zeno
Used to buy Zenith branded ones by the gross for 19 cents.
They seemed to work as good as any but I dont know who
made them. Radio Shack ones were junk. people would
replace a few & we always came out & replaced them. When
old they are fussy as to where they work. In other words they
may work in AGC but no 3.58 osc.
73 Zeno 
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I used a lot of Zenith branded tubes, back then. They had a better price on them, than the RCA's and GE's. Don't remember a price like that.
GE and Sylvania made most of the replacement, Zenith tubes.
RadioShack tubes, seemed to be Japanese Raytheon's.