Home Tubes Asylum

Questions about tubes and gear that glows. FAQ

Leakage? -- Hum from new tube


Another possibility for the hum could be due to leakage in the 6SN7 you identified as emitting a small amount of hum. Such a tube can work perfectly without any hum in some circuits (such as driver applications) whereas in other circuits while otherwise functioning properly will cause some hum (such as in a gain stage).

Thus if you have such a tube don't assume it is bad and thus dump it. Instead be aware there are applications you can use it that the leakage does not induce the hum.

Per a well-known tube store: You cannot correlate leakage with wear as many new tubes have leakage and obviously no wear. Where leakage is a serious problem relates primarily to applications higher than the audio frequency range.

Edits: 02/08/17

This post is made possible by the generous support of people like you and our sponsors:
  Take Five Audio  

Follow Ups Full Thread
Follow Ups
  • Leakage? -- Hum from new tube - JazzDude 09:17:38 02/08/17 (0)


Post a Message!

Forgot Password?
Moniker (Username):
Password (Optional):
  Remember my Moniker & Password  (What's this?)    Eat Me
E-Mail (Optional):
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.