>Is the production in USA now?
China. No one has the glass machines (Sealex or whatever they're
called now) in the US. But I have a good source who told me
Richardson makes the 4PR1000 elements here, and ships them to China to
be used in the bulbs. I find that interesting because I have no idea
who is still using the 4PR1000 who would pay for a new one. So I
advise some scepticism on this.
I think the 3-400 is a more rugged tube, but this is good news to all
the 3-500 amplifier owners. They're also good as modulators and the
Power Pebble uses them.
73
Rob
K5UJ
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