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Originally Posted by Charlie
I have an interesting tube... looks to be a HV rectifier... a 3DR3. It has a thick lead shield covering the entire tube and it's heavy! I've never seen a set using this tube... I'm assuming it was likely used in the later years... maybe late 60s / early 70s.
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They're used in the GE C-2 chassis from the early 70's.The only sets I remember seeing those in.