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Author Topic: How much color on a 3-500ZG  (Read 5404 times)
KM3F
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Posts: 910




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« Reply #15 on: August 08, 2015, 01:37:37 PM »

Yep, purple says they leaked air inside from a crack on their glass envelopes.
Good luck.
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NO2A
Member

Posts: 1400




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« Reply #16 on: August 08, 2015, 03:32:40 PM »

Yep, purple says they leaked air inside from a crack on their glass envelopes.
Good luck.
That was years ago with an old SB220 I bought at a hamfest.
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KM1H
Member

Posts: 5491




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« Reply #17 on: August 09, 2015, 08:17:09 AM »

In the late 80's Eimac moved glass tube production to the Salt Lake City plant and early production sealing was very poor, 3-500Z tubes went to air in a year or so. The date codes were in the 1988-89 region and I dont have my notes handy with the exact dates.

Carl
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