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Heater Wiring - the Good the Bad and the Ugly
Heater Wiring - the Good the Bad and the Ugly
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Old 11th January 2017, 09:12 PM   #131
finom1 is offline finom1  United States
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Two Types of Tube Amplifier Hum and How to Determine the Source

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Old 10th April 2017, 05:20 PM   #132
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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The best way is to put their respective magnetic axis at 90 between them. This is true if no more than 3 cores are in the set, if 4 or more, then you will need careful cut and try, and shielding.
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Old 11th April 2017, 04:25 PM   #133
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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OK, good luck‼
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Old 25th February 2018, 10:13 PM   #134
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After fighting "heater hum" for weeks, I finally just replaced all wiring that carries AC with shielded wire, and grounded the shield at one end. End result is no more (audible) hum of any kind.
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Old 2nd March 2018, 08:00 AM   #135
trobbins is offline trobbins  Australia
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Bluerooster, had you tried a tuned humdinger during your trials and tribulations before going to twisted and shielded runs ?
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Old 3rd March 2018, 10:04 PM   #136
Lingwendil is offline Lingwendil  United States
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Heater Wiring - the Good the Bad and the Ugly
Best way that I have found to keep heaters hum free is a nice tight twist, and tucking everything around sockets, and hugging corners away from other components... make "drops" from the edge of the chassis to the tube sockets, taking care to only cross other signal wiring at 90 (perpendicular) angles. Lifting the heater reference from ground up to a higher voltage (as you would when working with a concertina splitter or cathode follower anyway) can further help. Solid core wire is handy for keeping everything tucked away without glue or cable tie wraps. I have such consistent success that I don't bother with DC heaters on anything that doesn't have a SMPS anymore, or the occasional instance where series DC heating would be more logistically convenient (like when you already have 12~15 volt rails for clamps or similar circuitry) or easier to implement.
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