Forums https://www.decware.com/cgi-bin/yabb22/YaBB.pl AUDIO FORUMS >> General Discussion and Support >> Input tube related hum https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1571277904 Message started by Rivieraranch on 10/17/19 at 03:05:04

Title: Input tube related hum Post by Rivieraranch on 10/17/19 at 03:05:04 My Mini Torii developed an annoying hum from the right. I first swapped the rectifiers to opposite sides but the hum persisted. Then I switched the inputs. Well damned if the hum didn’t move to the left side! I obtained this NOS 1970’s RCA 5814 black plate pair earlier this year. They’ve been running 24/7 since around April. They tested good but it seems this one didn’t last very long. Oh well.

Title: Re: Input tube related hum Post by Steve Deckert on 11/05/19 at 02:21:53 When an input tube adds hum to an amplifier that was originally hum free, it is because the AC heater is leaking into the other elements inside the tube.  I had one just today that had 12dB of hum on one side only. Steve

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