Bottlehead Forum

General Category => Technical topics => Topic started by: butchbass on June 08, 2017, 07:56:48 AM

Title: Unloaded output
Post by: butchbass on June 08, 2017, 07:56:48 AM

I read on Audio Asylum that operating a tube amp with no load connected to the output can mess up the tubes. Why is this?
This would mean that an A/B switch would need to be make before break?

Title: Re: Unloaded output
Post by: Doc B. on June 08, 2017, 08:28:10 AM

Don't believe everything you read on AA. If an amp has lots of global negative feedback it might go into oscillation with the output load removed. If an amp does not use negative global feedback this is not an issue.

Title: Re: Unloaded output
Post by: butchbass on June 09, 2017, 08:39:18 AM

Thanks Doc.

Title: Re: Unloaded output
Post by: xcortes on June 09, 2017, 10:56:20 AM

I only have blind faith on PJ's posts.