Tubes Asylum

Questions about tubes and gear that glows. FAQ

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

re: still trying to track down a hum...

Posted by mr9iron on September 21, 2012 at 14:18:17:
Ron,

thanks for replying, I have considered this, I have taken some steps to see if this was possible, albeit it, they might not be extensive enough to rule it out, but anything is possible..

I tried running through a variac, was told the variac would act like an inductor and filter any AC line noise out, isolate it... It still hummed, I also tried different circuits including the newest line (1 year old electric) in my house. I killed anything florescent as well, still the hum persisted.

So just to update the thread.. I have been able to reduce the hum by about 85%-90%. I have it set up with jumpers right now, and I am testing it. It's probably acceptable, but not totally solved. The rest could be AC line noise as you suggested or my pre-amp, which I am such isn't perfect.

The set up is almost illogical, but I have another V that does the same thing so I will try it on that unit to see if I get the same result, if it does then it will be hard to argue. The other inmate who respond to the thread and has the same issue, is also going to try this method and report back so we'll see if it has merit or if it's a fluke. If the other two are reduced, then I will post what I tried.. I am still, of course, grateful for any suggestions or theories that are posted..

thanks!

Jeff