Comments on: Grounding Tube Circuits https://www.epanorama.net/blog/2017/10/31/grounding-tube-circuits/ All about electronics and circuit design Tue, 14 Apr 2026 22:35:42 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Tomi Engdahl https://www.epanorama.net/blog/2017/10/31/grounding-tube-circuits/comment-page-1/#comment-1829537 Wed, 05 Jun 2024 10:13:41 +0000 http://www.epanorama.net/newepa/?p=60773#comment-1829537 Ham Busts The Myth Of Ground
https://hackaday.com/2024/06/04/ham-busts-the-myth-of-ground/

Ground is a Myth! | 2024 ARRL National Convention
https://www.youtube.com/watch?v=VvE570NPmmI

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/10/31/grounding-tube-circuits/comment-page-1/#comment-1718257 Wed, 07 Jul 2021 07:11:00 +0000 http://www.epanorama.net/newepa/?p=60773#comment-1718257 I all else has been attempted, a possible common mode rejection issue could be the source. Below is essential reading for all DIY, repair techs and system installers. https://web.mit.edu/jhawk/tmp/p/EST016_Ground_Loops_handout.pdf

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/10/31/grounding-tube-circuits/comment-page-1/#comment-1718256 Wed, 07 Jul 2021 07:07:37 +0000 http://www.epanorama.net/newepa/?p=60773#comment-1718256 Let’s try to isolate the problem. Take RCA cable. Plug in one end to power amplifier inputs. Short on both L and R channels the center pin of RCA to RCA shied. Make sure that L and R ends do not touch each other. I expect that the amp is quiet now. Connect L and R grounds together on cable end not connected to amp -> if noise comes back it is loop noise coupled to cable and/or amplifier inside. Disconnect L&R grounds again on cable end and do L to R ground connection shorting on amplifier RCAs -> if noise comes back the problem is inside power amplifier ground arrangements. Make sure you have proper single point grounding and proper routing of signal cables.

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/10/31/grounding-tube-circuits/comment-page-1/#comment-1620443 Thu, 10 Jan 2019 15:24:34 +0000 http://www.epanorama.net/newepa/?p=60773#comment-1620443 Two Types of Tube Amplifier Hum and How to Determine the Source
https://www.youtube.com/watch?v=GrVtX0QGNls

In this video, I discuss two types of hum found in tube amplifiers, how to easily differentiate between the causes, and how to effectively remedy the situation. The technical aspects of this discussion are explained in basic, comprehensible language. I hope you find it to be both interesting and informative. NOTE: The frequencies stated in the video (60Hz and 120Hz) refer to 60Hz primary AC. If your AC source is 50Hz, then the frequencies would be 50Hz and 100Hz.

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