#1
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NOS 6U5 Tube fail?
My Zenith 7S363 has started developing problems since being electrically restored. I noticed the, formerly bright, 6U5 tube start to noticeably dim. I know these tubes are known to deteriorate but this is unusual to me. Anyone have ideas?
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Rick (Sparks) Ethridge |
#2
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Quote:
I have the very same set. It needs a new grill cloth and the cabinet can use a little attention. The tuning eye is a little dark as well. |
#3
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Discussion on brightening eye tubes here..
http://www.nostalgiaair.org/Forums/M...0/M0066090.htm |
#4
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More discussion here:
http://radiomuseum.org/forum/lightin...eye_tubes.html As the P-1 phosphor used in these early eye tubes is subject to Columb ageing, the trick is to increase the target voltage for increased brightness *while* reducing the target current to reduce the rate of ageing. jr |
#5
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I appreciate the replies to my message. While I've purchased an additional tuning tube and also have a questionable spare I will take your advice seriously. New tubes are no longer manufactured and building a solid-state substitute would be difficult. I believe that a solution based on your advice is possible as does my friend/technician.
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Rick (Sparks) Ethridge |
Audiokarma |
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