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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: The crappy Zenith posted by Byrd69 on November 19, 2015 at 06:41:32:
"You're likely using a vintage tube by RCA, Sylvania, Tung-Sol, etc. that is better than your new production tube(s)."
That's pure speculation at best. The old stock tube may be different, but better? What criteria is better in such a way to not hum?
As Chip posted in this thread, it could be the old tubes are tired while the new tubes are fresh ("better"?) - the exact opposite of what you said. The reissue Genalex has a spiral wound hum-rejecting heater winding, the reissue Tung-Sol does not. So the Genalex is equivalent in construction to the old tubes' heaters - but is humming just like the Tung-Sol without the spiral wound heater.
The tubes can't hum on their own - the hum is either induced by an external hum field that exists either above OR below the chassis deck - or there is hum coming in on one of the connections to the rest of the circuitry. We simply have not been able to track down the source so corrective action could be taken.
It has nothing to do (with the possible exception of what Chip posted) with "betterness".
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Follow Ups
- RE: The crappy Zenith - Jim McShane 07:34:58 11/19/15 (1)
- RE: The crappy Zenith - Byrd69 07:44:41 11/19/15 (0)
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