Jtm50 black flag kit standby hum
Moderators: pompeiisneaks, Colossal
Re: Jtm50 black flag kit standby hum
I wonder if this dry connection has something to do with it?
You do not have the required permissions to view the files attached to this post.
Re: Jtm50 black flag kit standby hum
You do not have the required permissions to view the files attached to this post.
Re: Jtm50 black flag kit standby hum
If the tubes in this amp are 6L6G, that's not important, but if it's EL34 then it could be a problem.
Re: Jtm50 black flag kit standby hum
Yes el34
Re: Jtm50 black flag kit standby hum
Very possibly - well spotted!
The valve will be likely to conduct a higher idle anode current if its suppressor grid (pin1) is floating, rather than connected to 0V.
And the hum sounded like mismatched output valves to me, hence the test I suggested.
Solder it properly and report back.
https://www.justgiving.com/page/5-in-5-for-charlie This is my step son and his family. He is running 5 marathons in 5 days to support the research into STXBP1, the genetic condition my grandson Charlie has. Please consider supporting him!
Re: Jtm50 black flag kit standby hum
With thanks to all who contributed special thanks to PDF64 who pointed me to the area that needed investigating i found the problem all goood 
