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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 26 May 2018, 18:20

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 Post subject: Re: Hum, Buzz and Hiss
PostPosted: 14 May 2018, 16:08 

Joined: 09 Oct 2012, 19:43
Posts: 290
Location: Vancouver Canada
I recall years ago the "Mark 10" remote control and/or security system for the home owner. (turn lights on off, alarm windows and doors etc). They worked ok but many suffered from the same poltergeists Mark and Bruce suffer from. The suggested remedy was to place a .01uF/1000v disc across the line right in the breaker panel. It worked as long as the source of the noise was on another leg of the hydro feed. Noise was bled off before it corrupted the second 110v leg. Then someone would plug in a vacuum cleaner and it was game over!
It is possible to buy a wall/house receptacle that is mostly aimed at the computer industry but should be included in the audio industry as well. (they come in bright orange only though). It's made for North Ameriac's 220vCT hydro but may be available for 220vac countries not sure. The receptacle had hot and 3 separate gnds. 1= neutral return, 2= 2nd safety gnd return, 3= gnd shield. Most cases "BX" or flex cable is used for the feed so the "gnd shield" is connected to the outer metal jacket of the wire. And it's a dedicated separate feed back to the breaker panel.

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