Home Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

RE: Filament hum

I tried several, including a simple bridge/filter, a bridge/filter/regulator (linear), and a switcher. Switchers have a potential advantage insofar as their high frequency step-down transformers isolate the DC from common-mode noise on the AC line. It was my experience in every case, however, that DC heating of the 211 sounded dry and lifeless compared to AC, regardless of how the DC was derived. That was the impetus behind my search for a practical (i.e. inexpensive) method of ultrasonic heating.





This post is made possible by the generous support of people like you and our sponsors:
  Signature Sound   [ Signature Sound Lounge ]


Follow Ups Full Thread
Follow Ups

FAQ

Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
Subject:
Message:   (Posts are subject to Content Rules)
Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:  Automagically notify you when someone responds.