Home » Audio » Thermionic Emissions » Trigger finger is itchy
Re: Trigger finger is itchy [message #92408 is a reply to message #92403] Fri, 09 October 2020 21:51 Go to previous messageGo to next message
gofar99 is currently offline  gofar99
Messages: 1557
Registered: May 2010
Location: Southern Arizona
Illuminati (4th Degree)
Hummmm. I believe I would upgrade it to shielded wire regardless, just because I am a fanatic about hum and noise and any at all is too much.

Good Listening
Bruce
Re: Trigger finger is itchy [message #92410 is a reply to message #92408] Sat, 10 October 2020 09:58 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17886
Registered: January 2001
Illuminati (33rd Degree)

After you finish this project (or before, for that matter), if you want I have some shielded cable that I used when I built my IR Remote Passive "Preamp" prototypes way back when. Just ping me if you want ten or twenty feet of the stuff and I'll mail it to you.
Re: Trigger finger is itchy [message #92411 is a reply to message #92410] Sat, 10 October 2020 12:12 Go to previous messageGo to next message
Rusty is currently offline  Rusty
Messages: 419
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
Thanks both of you and Wayne specifically. Where would the shield portion go? Some ground point on the case? Still though, the design doesn't use shielded inputs or outputs, or sleeve ground. Just the single wire to the center tip. I'm not sophisticated enough to know his justification. Any idear's? If this is a chronic dilemma I'm facing. Reckon I'd give anything a try. The noise is constant, on all switched inputs, doesn't go up in loudness with volume control, or gain control. Thanks for any tips.
Re: Trigger finger is itchy [message #92412 is a reply to message #92411] Sat, 10 October 2020 15:25 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 17886
Registered: January 2001
Illuminati (33rd Degree)

Connect one end to ground, whichever side is most convenient. Just leave the other end bare - Cut back the shield braid right along with the outside jacket. You might even put 1/4" to 1/2" of heat-shrink tubing over the edge where the outside jacket ends, to cover the frayed edge of the shield braid.

That way the shield is grounded, but no ground loops are created 'cause it's only connected at one end.
Re: Trigger finger is itchy [message #92481 is a reply to message #92412] Fri, 23 October 2020 05:29 Go to previous message
Rusty is currently offline  Rusty
Messages: 419
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
I did all that my meager knowledge and skills allowed. The last effort was to try a cheater plug and see if that broke the ground loop. It's in the shop with the master. He said he'd fix it. It'll be interesting to find out what the hell I did wrong. Probably something very elemental. But it escaped me going over what I did.
Previous Topic: Guitar Amp
Next Topic: Solid State vs. Vacuum Amps
Goto Forum:
  


Current Time: Sat Oct 31 14:20:37 CDT 2020

Sponsoring Organizations

DIY Audio Projects
DIY Audio Projects
OddWatt Audio
OddWatt Audio
Pi Speakers
Pi Speakers
Prosound Shootout
Prosound Shootout
Smith & Larson Audio
Smith & Larson Audio
Tubes For Amps
TubesForAmps.com

Lone Star Audiofest