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Input tube related hum (Read 1391 times)
Rivieraranch
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Posts: 2126
Input tube related hum
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.
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MINI TORII & ZROCK2 both anniversaried; 'Lil Audio F-15; TECHNICS SL1200MK2 KAB MODDED TT; ONKYO 6 DISC CD; MARANTZ 2226B; SCHIIT MULTIBIT DAC; SENNHEISER HD-580s
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Steve Deckert
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If the 1st watt
sucks why continue?

Posts: 6246
Re: Input tube related hum
Reply #1 - 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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