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Only Zonum rebuilt I've tried became gassy. Must have been a slow leak as over a month period it began to arc more & more and effeciency started to drop off quickly so I pulled it. Sent it back & they declared we had run it with poor air flow so NO warrantee and the tube was scrap. Strange since I put the old tube back in & it ran flawlessly for another couple months.
Econco tubes have been much better to us lately (Hope I'm not jinxing myself).
Econco rebuild just pulled lasted 3 years and 11 months.
In the past they lasted just under 2 years.
Have put in two Econco rebuilds in the last two months & so far very good.
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