Home » Audio » Thermionic Emissions » rectifying the hum
rectifying the hum [message #9259] Sun, 09 October 2005 20:08 Go to next message
PakProtector is currently offline  PakProtector
Messages: 935
Registered: May 2009
Illuminati (2nd Degree)
Hey-hey!!!,
Seems that nothing is perfect enough in audio. I rigged the TX coupled pre with AC on its filaments and found it hum free. The previous linestage had DC everywhere, and a litle bit of noise.

I changed the active load tubes to AC and a lot ov the fuzz went away.

So, is AC better than DC? Is only DC quiet enough?

Maybe...

So, how to make good DC? More importantly, can I start with AC and leave room to build DC later? Man, that's a bit simpler( and potentially a lot lighter ). I am seriously looking forward to removing about 10 lbs of filter Iron from the 12B4 linestage.

Oh well, it's been a fun weekend building and tweaking and of course listening with friends. Oh, seatbelt your amps when you travel...don't ask!
cheers,
Douglas

Re: rectifying the hum [message #9261 is a reply to message #9259] Sun, 09 October 2005 23:30 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18774
Registered: January 2001
Illuminati (33rd Degree)

Nothing is as pure as a regulated supply. Takes the parts count way up thought.

Then again, some amps are less sensitive to PS ripple. One of the three things I like best about PP is the PS common-mode ripple cancellation. The other two are harmonic distortion cancellation and damping, but those are different subjects altogether.


Previous Topic: LIGHTS ARE GLOWING IN QUEENSLAND...... YIPPEE
Next Topic: Polarized non-polar caps
Goto Forum:
  


Current Time: Sun Oct 06 08:18:25 CDT 2024

Sponsoring Organizations

DIY Audio Projects
DIY Audio Projects
OddWatt Audio
OddWatt Audio
Pi Speakers
Pi Speakers
Prosound Shootout
Prosound Shootout
Miller Audio
Miller Audio
Tubes For Amps
TubesForAmps.com

Lone Star Audiofest